S-8355/56/57/58 Series

Transcription

1 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER ABLIC Inc., -15 Rev.8.1_ The is a CMOS step-up switching regulator controller which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM control circuit (S-8355/57 Series) and a PWM/PFM switching control circuit (S-8356/58 Series). With an external low-on-resistance Nch Power MOS, this product is ideal for applications requiring high efficiency and a high output current. The S-8355/57 Series realizes low ripple, high efficiency, and excellent transient characteristics due to its PWM control circuit whose duty ratio can be varied linearly from to 83% (from to 78% for 5 khz, 3 khz, and 6 khz models), an excellently designed error amplifier and a phase compensation circuits. S-8356/58 Series features a PWM/PFM switching controller that can switch the operation to a PFM controller with a duty ratio is 15% under a light load to prevent a decline in the efficiency due to the IC operating current. Features Low voltage operation : Startup at.9 V min. (I OUT = 1 ma) guaranteed Low current consumption : During operation 5.9 A (3.3 V, 1 khz, typ.) During shutdown.5 A (max.) Duty ratio : Built-in PWM/PFM switching control circuit (S-8356/58 Series) 15 to 83% (1 khz models) 15 to 78% (5 khz, 3 khz, and 6 khz models) External parts : Coil, diode, capacitor, and transistor Output voltage : Selectable in.1 V steps between 1.5 and 6.5 V (for V DD / V OUT separate types) Selectable in.1 V steps between. and 6.5 V (for other than V DD / V OUT separate types) Output voltage accuracy :.4% Oscillation frequency : 1 khz, 5 khz, 3 khz, 6 khz selectable Soft start function : 6 ms (1 khz, typ.) Shutdown function Lead-free, Sn 1%, halogen-free *1 *1. Refer to Product Name Structure for details. Applications Power supplies for portable equipment such as digital cameras, electronic notebooks, and PDAs Power supplies for audio equipment such as portable CD / MD players Constant voltage power supplies for cameras, VCRs, and communications devices Power supplies for microcomputers Packages SOT-3-3 SOT-3-5 SOT

2 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Block Diagrams (1) S-8357/58 Series B, H and F Types (Without Shutdown Function) () S-8357/58 Series B, H, F and N Types (With Shutdown Function) VOUT VOUT EXT Oscillation circuit PWMcontrol circuit or PWM / PFM switching control circuit Soft start built-in reference power supply IC internal power supply Phase compensation circuit VSS EXT Oscillation circuit PWMcontrol circuit or PWM / PFM switching control circuit Soft start built-in reference power supply IC internal power supply Phase compensation circuit VSS ON / OFF Figure 1 Figure (3) S-8357/58 Series E, J, G and P Types (V DD / V OUT Separate Type) (4) S-8355/56 Series K, L, M and Q Types (With Shutdown Function, V DD / V OUT Separate Type) VDD VOUT VDD VOUT EXT Oscillation circuit PWMcontrol circuit or PWM / PFM switching control circuit Soft start built-in reference power supply IC internal power supply Phase compensation circuit VSS EXT Oscillation circuit PWMcontrol circuit or PWM / PFM switching control circuit Soft start built-in reference power supply IC internal power supply Phase compensation circuit VSS ON / OFF Figure 3 Figure 4

3 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Product Name Structure The control system, product types, output voltage, and packages for the can be selected at the user s request. Please refer to the 3. Product Name for the definition of the product name, 4. Package regarding the package drawings and 5. Product Name List for the full product names. 1. Function List (1) PWM Control Products Product Name Switching Frequency khz Shutdown Function V DD / V OUT Separate Type Table 1 Package Application S-8355KxxMC 1 Yes Yes SOT-3-5 Applications requiring variable output voltage and a shutdown function S-8355LxxMC 5 Yes Yes SOT-3-5 Applications requiring variable output voltage, a shutdown function, and a thin coil S-8355MxxMC 3 Yes Yes SOT-3-5 Applications requiring variable output voltage, a shutdown function, and a thin coil S-8355QxxMC 6 Yes Yes SOT-3-5 Applications requiring variable output voltage, a shutdown function, and a thin coil S-8357BxxMC 1 Yes SOT-3-5 Applications requiring a shutdown function S-8357BxxMA 1 SOT-3-3 Applications not requiring a shutdown function S-8357BxxUA 1 SOT-89-3 Applications not requiring a shutdown function S-8357ExxMC 1 Yes SOT-3-5 Applications in which output voltage is adjusted by external resistor S-8357FxxMC 3 Yes SOT-3-5 Applications requiring a shutdown function and a thin coil S-8357GxxMC 3 Yes SOT-3-5 Applications requiring variable output voltage and a thin coil S-8357HxxMC 5 Yes SOT-3-5 Applications requiring a shutdown function and a thin coil S-8357JxxMC 5 Yes SOT-3-5 Applications requiring variable output voltage with an external resistor and a thin coil S-8357NxxMC 6 Yes SOT-3-5 Applications requiring a shutdown function and a thin coil S-8357PxxMC 6 Yes SOT-3-5 Applications requiring variable output voltage with an external resistor and a thin coil 3

4 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ () PWM / PFM Switching Control Products Product Name Switching Frequency khz Shutdown Function V DD / V OUT Separate Type Table Package Application S-8356KxxMC 1 Yes Yes SOT-3-5 Applications requiring variable output voltage and a shutdown function S-8356LxxMC 5 Yes Yes SOT-3-5 Applications requiring variable output voltage, a shutdown function, and a thin coil S-8356MxxMC 3 Yes Yes SOT-3-5 Applications requiring variable output voltage, a shutdown function, and a thin coil S-8356QxxMC 6 Yes Yes SOT-3-5 Applications requiring variable output voltage, a shutdown function, and a thin coil S-8358BxxMC 1 Yes SOT-3-5 Applications requiring a shutdown function S-8358BxxMA 1 SOT-3-3 Applications not requiring a shutdown function S-8358BxxUA 1 SOT-89-3 Applications not requiring a shutdown function S-8358ExxMC 1 Yes SOT-3-5 Applications in which output voltage is adjusted by external resistor S-8358FxxMC 3 Yes SOT-3-5 Applications requiring a shutdown function and a thin coil S-8358GxxMC 3 Yes SOT-3-5 Applications requiring variable output voltage and a thin coil S-8358HxxMC 5 Yes SOT-3-5 Applications requiring a shutdown function and a thin coil S-8358JxxMC 5 Yes SOT-3-5 Applications requiring variable output voltage with an external resistor and a thin coil S-8358NxxMC 6 Yes SOT-3-5 Applications requiring a shutdown function and a thin coil S-8358PxxMC 6 Yes SOT-3-5 Applications requiring variable output voltage with an external resistor and a thin coil. Package and Function List by Product Type Table 3 Series Name S-8355 Series, S-8356 Series S-8357 Series S-8358 Series Type K, L, M, Q (Shutdown function V DD / V OUT separate type) K = 1 khz, L = 5 khz, M = 3 khz, Q = 6 khz B, H, F (Normal product) B = 1 khz, H = 5 khz, F = 3 khz N (Normal product) N = 6 khz E, J, G, P (V DD / V OUT separate type) E = 1 khz, J = 5 khz, G = 3 khz, P = 6 khz B, H, F (Normal product) B = 1 khz, H = 5 khz, F = 3 khz N (Normal product) N = 6 khz E, J, G, P (V DD / V OUT separate type) E = 1 khz, J = 5 khz, G = 3 khz, P = 6 khz Package Name (Abbreviation) Shutdown Function Yes / No V DD / V OUT Separate Type Yes / No MC Yes Yes MA / UA MC No Yes No MC Yes No MC No Yes MA / UA MC No Yes No MC Yes No MC No Yes 4

5 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 3. Product Name (1) SOT-3-3 Packages S-835 x x xx MA - xxx T G Environmental code G : Lead-free (for details, please contact our sales office) IC direction in tape specifications *1 T : SOT-3-3 Product name (abbreviation) * Package name (abbreviation) MA : SOT-3-3 Output voltage 15 to 65 (e.g. When the output voltage is 1.5 V, it is expressed as 15.) Product type B : Normal product, (S-8357/58 Series) H : Normal product, (S-8357/58 Series) F : Normal product, (S-8357/58 Series) N : Normal product, (S-8357/58 Series) E : V DD / V OUT separate type, (S-8357/58 Series) J : V DD / V OUT separate type, (S-8357/58 Series) G : V DD / V OUT separate type, (S-8357/58 Series) P : V DD / V OUT separate type, (S-8357/58 Series) K : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) L : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) M : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) Q : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) f OSC = 1 khz f OSC = 5 khz f OSC = 3 khz f OSC = 6 khz f OSC = 1 khz f OSC = 5 khz f OSC = 3 khz f OSC = 6 khz f OSC = 1 khz f OSC = 5 khz f OSC = 3 khz f OSC = 6 khz Control system 5 or 7 : PWM control 6 or 8 : PWM / PFM switching control *1. Refer to the tape specifications. *. Refer to the Table 4 to Table 11 in the 5. Product Name List. 5

6 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ () SOT-3-5, SOT-89-3 Packages S-835 x x xx xx - xxx T x Environmental code U : Lead-free (Sn 1%), halogen-free G : Lead-free (for details, please contact our sales office) IC direction in tape specifications *1 T : SOT-3-5, SOT-89-3 Product name (abbreviation) * Package name (abbreviation) MC : SOT-3-5 UA : SOT-89-3 Output voltage 15 to 65 (e.g. When the output voltage is 1.5 V, it is expressed as 15.) Product type B : Normal product, (S-8357/58 Series) H : Normal product, (S-8357/58 Series) F : Normal product, (S-8357/58 Series) N : Normal product, (S-8357/58 Series) E : V DD / V OUT separate type, (S-8357/58 Series) J : V DD / V OUT separate type, (S-8357/58 Series) G : V DD / V OUT separate type, (S-8357/58 Series) P : V DD / V OUT separate type, (S-8357/58 Series) K : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) L : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) M : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) Q : With shutdown function V DD / V OUT separate type, (S-8355/56 Series) f OSC = 1 khz f OSC = 5 khz f OSC = 3 khz f OSC = 6 khz f OSC = 1 khz f OSC = 5 khz f OSC = 3 khz f OSC = 6 khz f OSC = 1 khz f OSC = 5 khz f OSC = 3 khz f OSC = 6 khz Control system 5 or 7 : PWM control 6 or 8 : PWM / PFM switching control *1. Refer to the tape specifications. *. Refer to the Table 4 to Table 11 in the 5. Product Name List. 4. Package Package Name Drawing Code Package Tape Reel SOT-3-3 MP3-A-P-SD MP3-A-C-SD MP3-A-R-SD SOT-3-5 MP5-A-P-SD MP5-A-C-SD MP5-A-R-SD SOT-89-3 UP3-A-P-SD UP3-A-C-SD UP3-A-R-SD 6

7 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 5. Product Name List Output voltage (1) S-8355 Series S-8355KxxMC Series S-8355LxxMC Series Table 4 S-8355MxxMC Series S-8355QxxMC Series 1.5 V S-8355L15MC-NCATx S-8355Q15MC-OWATx 1.8 V S-8355K18MC-NADTx S-8355M18MC-MCDTx S-8355Q18MC-OWDTx. V S-8355KMC-NAFTx S-8355LMC-NCFTx S-8355MMC-MCFTx S-8355QMC-OWFTx.4 V S-8355K4MC-NAJTx S-8355Q4MC-OWJTx.8 V S-8355Q8MC-OWNTx 3. V S-8355K3MC-NAPTx S-8355M3MC-MCPTx S-8355Q3MC-OWPTx 3.1 V S-8355K31MC-NAQTx S-8355M31MC-MCQTx S-8355Q31MC-OWQTx 3. V S-8355M3MC-MCRTx 3.3 V S-8355K33MC-NASTx S-8355Q33MC-OWSTx 3.4 V S-8355M34MC-MCTTx S-8355Q34MC-OWTTx 4.5 V S-8355Q45MC-OXETx 5. V S-8355K5MC-NBJTx S-8355M5MC-MDJTx S-8355Q5MC-OXJTx 5.1 V S-8355Q51MC-OXKTx 5.5 V S-8355M55MC-MDOTx 6. V S-8355M6MC-MDTTx S-8355Q6MC-OXTTx 6.5 V S-8355M65MC-MDYTx Remark 1. Please contact the ABLIC Inc. marketing department for products with an output voltage other than those specified above.. x: G or U 3. Please select products of environmental code = U for Sn 1%, halogen-free products. Output voltage () S-8356 Series S-8356KxxMC Series S-8356LxxMC Series Table 5 S-8356MxxMC Series S-8356QxxMC Series 1.5 V S-8356M15MC-MEATx 1.8 V S-8356K18MC-NEDTx S-8356M18MC-MEDTx S-8356Q18MC-OYDTx.8 V S-8356Q8MC-OYNTx 3. V S-8356K3MC-NEPTx S-8356L3MC-NGPTx S-8356M3MC-MEPTx S-8356Q3MC-OYPTx 3.1 V S-8356M31MC-MEQTx S-8356Q31MC-OYQTx 3.3 V S-8356K33MC-NESTx S-8356M33MC-MESTx S-8356Q33MC-OYSTx 3.5 V S-8356M35MC-MEUTx S-8356Q35MC-OYUTx 3.6 V S-8356K36MC-NEVTx S-8356M36MC-MEVTx 4. V S-8356K4MC-NEZTx S-8356Q4MC-OYZTx 5. V S-8356K5MC-NFJTx S-8356M5MC-MFJTx S-8356Q5MC-OVJTx 5.3 V S-8356Q53MC-OVMTx Remark 1. Please contact the ABLIC Inc. marketing department for products with an output voltage other than those specified above.. x: G or U 3. Please select products of environmental code = U for Sn 1%, halogen-free products. 7

8 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Output voltage (3) S-8357 Series S-8357BxxMC Series S-8357BxxMA Series Table 6 S-8357BxxUA Series S-8357ExxMC Series 1.5 V S-8357E15MC-NKATx. V S-8357EMC-NKFTx.5 V S-8357B5MC-NIKTx.6 V S-8357B6MC-NILTx.7 V S-8357B7MC-NIMTx.8 V S-8357B8MC-NINTx 3. V S-8357B3MC-NIPTx S-8357B3MA-NIPTG S-8357E3MC-NKPTx 3.3 V S-8357B33MC-NISTx S-8357B33MA-NISTG S-8357B33UA-NISTx 3.6 V S-8357B36MC-NIVTx 3.8 V S-8357B38UA-NIXTx 4. V S-8357B4MC-NIZTx 4.8 V S-8357B48MC-NJHTx S-8357B48UA-NJHTx 5. V S-8357B5MC-NJJTx S-8357B5MA-NJJTG S-8357B5UA-NJJTx S-8357E5MC-NLJTx 5. V S-8357B5MC-NJLTx 5.4 V S-8357B54MC-NJNTx 6. V S-8357B6MC-NJTTx Output voltage S-8357FxxMC Series S-8357GxxMC Series Table 7 S-8357HxxMC Series S-8357JxxMC Series. V S-8357JMC-NOFTx.5 V S-8357J5MC-NOKTx 3. V S-8357F3MC-MGPTx S-8357H3MC-NMPTG 3.1 V S-8357H31MC-NMQTG 3. V S-8357F3MC-MGRTx S-8357G3MC-MIRTx 3.3 V S-8357F33MC-MGSTx S-8357G33MC-MISTx 3.5 V S-8357H35MC-NMUTx 3.6 V S-8357F36MC-MGVTx S-8357H36MC-NMVTx 4. V S-8357H4MC-NNBTx 5. V S-8357F5MC-MHJTx S-8357G5MC-MJJTx S-8357H5MC-NNJTx S-8357J5MC-NPJTx 5. V S-8357F5MC-MHLTx S-8357H5MC-NNLTx 6.5 V S-8357F65MC-MHYTx Output voltage Table 8 S-8357NxxMC Series 3. V S-8357N3MC-OPTx 3.3 V S-8357N33MC-OSTx 5. V S-8357N5MC-O3JTx 5.3 V S-8357N53MC-O3MTU Remark 1. Please contact the ABLIC Inc. marketing department for products with an output voltage other than those specified above.. x: G or U 3. Please select products of environmental code = U for Sn 1%, halogen-free products. 8

9 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Output voltage (4) S-8358 Series S-8358BxxMC Series S-8358BxxMA Series Table 9 S-8358BxxUA Series S-8358ExxMC Series. V S-8358EMC-NSFTx.3 V S-8358B3MC-NQITx.5 V S-8358B5MC-NQKTx.6 V S-8358B6MC-NQLTx.7 V S-8358B7MC-NQMTx.8 V S-8358B8MC-NQNTx 3. V S-8358B3MC-NQPTx S-8358B3MA-NQPTG 3.1 V S-8358B31MC-NQQTx 3. V S-8358B3MC-NQRTx 3.3 V S-8358B33MC-NQSTx S-8358B33UA-NQSTx 3.5 V S-8358B35MC-NQUTx 3.6 V S-8358B36MC-NQVTx 3.8 V S-8358B38MC-NQXTx 4. V S-8358B4MC-NQZTx 5. V S-8358B5MC-NRJTx S-8358B5MA-NRJTG S-8358B5UA-NRJTx S-8358E5MC-NTJTx 5.3 V S-8358B53MC-NRMTx 6. V S-8358B6MC-NRTTx S-8358B6UA-NRTTx Output voltage S-8358FxxMC Series S-8358GxxMC Series Table 1 S-8358HxxMC Series S-8358JxxMC Series.3 V S-8358H3MC-NUITx.6 V S-8358F6MC-MKLTx.7 V S-8358F7MC-MKMTx 3. V S-8358F3MC-MKPTx S-8358H3MC-NUPTx 3. V - S-8358H3MC-NURTx 3.3 V S-8358F33MC-MKSTx S-8358H33MC-NUSTx S-8358J33MC-NWSTx 3.6 V S-8358F36MC-MKVTx 4. V - S-8358H4MC-NUZTx 5. V S-8358F5MC-MLJTx S-8358G5MC-MNJTx S-8358H5MC-NVJTx S-8358J5MC-NXJTx 5.3 V S-8358F53MC-MLMTx 5.7 V S-8358F57MC-MLQTx 6. V S-8358F6MC-MLTTx Output voltage S-8358NxxMC Series Table 11 S-8358PxxMC Series. V S-8358PMC-O8FTx 3. V S-8358N3MC-O6PTx 3.3 V S-8358N33MC-O6STx 5. V S-8358N5MC-O7JTx 5. V S-8358P5MC-O9LTx 5.3 V S-8358N53MC-O7MTx Remark 1. Please contact the ABLIC Inc. marketing department for products with an output voltage other than those specified above.. x: G or U 3. Please select products of environmental code = U for Sn 1%, halogen-free products. 9

10 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Pin Configurations SOT-3-3 Top view 1 Table 1 S-8357/58 Series B, H and F Types (Without shutdown function, V DD / V OUT non-separate type) Pin No. Symbol Pin Description 1 VOUT Output voltage pin and IC power supply pin VSS GND pin 3 EXT External transistor connection pin 3 Figure 5 SOT-3-5 Top view 5 4 Table 13 S-8355/56 Series K, L, M and Q Types (With shutdown function, V DD / V OUT separate type) Pin No. Symbol Pin Description 1 Figure VOUT Output voltage VDD IC power supply pin 3 ON / OFF Shutdown pin H : Normal operation (Step-up operating) L : Step-up stopped (Entire circuit stopped) 4 VSS GND pin 5 EXT External transistor connection pin Table 14 S-8357/58 Series B, H, F and N Types (With shutdown function, V DD / V OUT non-separate type) Pin No. Symbol Pin Description 1 ON / OFF Shutdown pin H : Normal operation (Step-up operating) L : Step-up stopped (Entire circuit stopped) VOUT Output voltage pin and IC power supply pin 3 NC *1 No connection 4 VSS GND pin 5 EXT External transistor connection pin *1. The NC pin indicates electrically open. Table 15 S-8357/58 Series E, J, G and P Types (Without shutdown function, V DD / V OUT separate type) Pin No. Symbol Pin Description 1 VOUT Output voltage pin VDD IC power supply pin 3 NC *1 No connection 4 VSS GND pin 5 EXT External transistor connection pin *1. The NC pin indicates electrically open. 1

11 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ SOT-89-3 Top view Table 16 S-8357/58 Series B, H and F Types (Without shutdown function, V DD / V OUT non-separate type) Pin No. Symbol Pin Description 1 VSS GND pin VOUT Output voltage pin and IC power supply pin 3 EXT External transistor connection pin 1 3 Figure 7 11

12 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Absolute Maximum Ratings Table 17 (Ta = 5C unless otherwise specified) Item Symbol Absolute maximum rating Unit VOUT pin voltage V OUT V SS.3 to V SS 1 V ON / OFF pin voltage *1 VON/ OFF V SS.3 to V SS 1 V VDD pin voltage * V DD V SS.3 to V SS 1 V EXT pin voltage B, H, F, N type V SS.3 to V OUT.3 V V EXT Others V SS.3 to V DD.3 V EXT pin current I EXT 8 ma SOT (When not mounted on board) mw 43 *3 mw Power dissipation SOT-3-5 P D 5 (When not mounted on board) mw 6 *3 mw SOT (When not mounted on board) mw 1 *3 mw Operating ambient temperature T opr 4 to 85 C Storage temperature T stg 4 to 15 C *1. With shutdown function *. For V DD / V OUT separate type *3. When mounted on board [Mounted board] (1) Board size : mm 76. mm t1.6 mm () Name : JEDEC STANDARD51-7 Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions. (1) When mounted on board () When not mounted on board Power dissiaption (PD) [mw] SOT-89-3 SOT-3-5 SOT Ambient temperature (Ta) [C] Power dissipation (PD) [mw] 6 4 Figure 8 Power Dissipation of The Package SOT-89-3 SOT-3-5 SOT Ambient temperature (Ta) [C] 1

13 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Electrical Characteristics (1) 1 khz Product (B, E and K Types) Table 18 (1 / ) (Ta = 5C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT V OUT(S) V OUT(S) V OUT(S) V Input voltage V IN 1 V Operation start voltage V ST1 I OUT = 1 ma.9 V Oscillation start voltage V ST No external parts, Voltage applied to V OUT.8 V 1 Operation holding voltage V HLD I OUT = 1 ma, Judged by decreasing V IN voltage gradually.7 V S-835xx15 to A 1 S-835xx to A 1 Current consumption 1 I SS1 V OUT = V OUT(S).95 S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 S-835xx15 to A 1 S-835xx to A 1 Current consumption I SS V OUT = V OUT(S).5 V S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 Current consumption during shutdown I SSS V = V ON/ OFF.5 A 1 (With shutdown function) S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTH V EXT = V OUT.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 EXT pin output current S-835xx6 to ma 1 S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTL V EXT =.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 S-835xx6 to ma 1 Line regulation V OUT1 V IN = V OUT(S).4 to mv Load regulation V OUT I OUT = 1 A to V OUT(S) / mv Output voltage temperature VOUT coefficient Ta VOUT Ta = 4 to 85C 5 ppm / C Oscillation frequency f OSC V OUT = V OUT(S) khz 1 Maximum duty ratio MaxDuty V OUT = V OUT(S) % 1 PWM / PFM switching duty ratio (For S-8356/58 Series) PFMDuty V IN = V OUT(S).1 V, No-load % 1 ON / OFF pin input voltage (With shutdown function) V SH Measured oscillation at EXT pin.75 V 1 V SL1 Judged oscillation stop at At V OUT 1.5 V.3 V 1 V SL EXT pin At V OUT 1.5 V. V 1 13

14 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Table 18 ( / ) (Ta = 5C unless otherwise specified) Measurement Item Symbol Condition Min. Typ. Max. Unit circuit ON / OFF pin input current (For with shutdown function) I SH I SL V = V ON/ OFF OUT(S) A 1 V = V ON/ OFF.1.1 A 1 Soft start time t SS ms Efficiency EFFI 85 % External parts Coil: CDRH6D8-47 of Sumida Corporation Diode: RB461F (Schottky type) of Rohm Co., Ltd. Capacitor: F93 (16 V, 47 F tantalum type) of Nichicon Corporation Transistor: CPH31 of Sanyo Electric Co., Ltd. Base resistor (R b ): 1. k Base capacitor (C b ): pf (ceramic type) V IN = V OUT(S).6 applied, I OUT = V OUT(S) / 5 With shutdown function : ON / OFF pin is connected to V OUT For V DD / V OUT separate type : VDD pin is connected to VOUT pin Remark 1. V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage.. V DD / V OUT separate type A step-up operation is performed from V DD =.8 V. However, 1.8 V V DD 1 V is recommended stabilizing the output voltage and oscillation frequency. (V DD 1.8 V must be applied for products with a set value of less than 1.9 V.) 14

15 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ () 5 khz Product (H, J and L Types) Table 19 (Ta = 5C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT V OUT(S) V OUT(S) V OUT(S) V Input voltage V IN 1 V Operation start voltage V ST1 I OUT = 1 ma.9 V Oscillation start voltage V ST No external parts, Voltage applied to V OUT.8 V 1 Operation holding voltage V HLD I OUT = 1 ma, Judged by decreasing V IN voltage gradually.7 V S-835xx15 to A 1 S-835xx to A 1 Current consumption 1 I SS1 V OUT = V OUT(S).95 S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 S-835xx15 to A 1 S-835xx to A 1 Current consumption I SS V OUT = V OUT(S).5 V S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 Current consumption during shutdown I SSS V = V ON/ OFF.5 A 1 (With shutdown function) S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTH V EXT = V OUT.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 EXT pin output current S-835xx6 to ma 1 S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTL V EXT =.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 S-835xx6 to ma 1 Line regulation V OUT1 V IN = V OUT(S).4 to mv Load regulation V OUT I OUT = 1 A to V OUT(S) / mv Output voltage temperature VOUT coefficient Ta VOUT Ta = 4 to 85C 5 ppm / C Oscillation frequency f OSC V OUT = V OUT(S) khz 1 Maximum duty ratio MaxDuty V OUT = V OUT(S) % 1 PWM / PFM switching duty ratio (For S-8356/58 Series) PFMDuty V IN = V OUT(S).1 V, No-load % 1 ON / OFF pin input voltage (With shutdown function) ON / OFF pin input current (With shutdown function) V SH Measured oscillation at EXT pin.75 V 1 V SL1 Judged oscillation stop at At V OUT 1.5 V.3 V 1 V SL EXT pin At V OUT 1.5 V. V 1 I SH V = V ON/ OFF OUT(S) A 1 I SL V = V ON/ OFF.1.1 A 1 Soft start time t SS ms Efficiency EFFI 85 % 15

16 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ External parts Coil: CDRH6D8- of Sumida Corporation Diode: RB461F (Schottky type) of Rohm Co., Ltd. Capacitor: F93 (16 V, 47 F tantalum type) of Nichicon Corporation Transistor: CPH31 of Sanyo Electric Co., Ltd. Base resistor (R b ): 1. k Base capacitor (C b ): pf (ceramic type) V IN = V OUT(S).6 applied, I OUT = V OUT(S) / 5 With shutdown function : ON / OFF pin is connected to V OUT For V DD / V OUT separate type : VDD pin is connected to VOUT pin Remark 1. V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage.. V DD / V OUT separate type A step-up operation is performed from V DD =.8 V. However, 1.8 V V DD 1 V is recommended stabilizing the output voltage and oscillation frequency. (V DD 1.8 V must be applied for products with a set value of less than 1.9 V.) 16

17 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ (3) 3 khz Product (F, G and M Types) Table (Ta = 5C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT V OUT(S) V OUT(S) V OUT(S) V Input voltage V IN 1 V Operation start voltage V ST1 I OUT = 1 ma.9 V Oscillation start voltage V ST No external parts, Voltage applied to V OUT.8 V 1 Operation holding voltage V HLD I OUT = 1 ma, Judged by decreasing V IN voltage gradually.7 V S-835xx15 to A 1 S-835xx to A 1 Current consumption 1 I SS1 V OUT = V OUT(S).95 S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 S-835xx15 to A 1 S-835xx to A 1 Current consumption I SS V OUT = V OUT(S).5 V S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 Current consumption during shutdown I SSS V = V ON/ OFF.5 A 1 (With shutdown function) S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTH V EXT = V OUT.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 EXT pin output current S-835xx6 to ma 1 S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTL V EXT =.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 S-835xx6 to ma 1 Line regulation V OUT1 V IN = V OUT(S).4 to mv Load regulation V OUT I OUT = 1 A to V OUT(S) / mv Output voltage temperature VOUT coefficient Ta VOUT Ta = 4 to 85C 5 ppm / C Oscillation frequency f OSC V OUT = V OUT(S) khz 1 Maximum duty ratio MaxDuty V OUT = V OUT(S) % 1 PWM / PFM switching duty ratio (For S-8356/58 Series) PFMDuty V IN = V OUT(S).1 V, No-load % 1 ON / OFF pin input voltage (With shutdown function) ON / OFF pin input current (With shutdown function) V SH Measured oscillation at EXT pin.75 V 1 V SL1 Judged oscillation stop at At V OUT 1.5 V.3 V 1 V SL EXT pin At V OUT 1.5 V. V 1 I SH V = V ON/ OFF OUT(S) A 1 I SL V = V ON/ OFF.1.1 A 1 Soft start time t SS ms Efficiency EFFI 85 % 17

18 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ External parts Coil: CDRH6D8- of Sumida Corporation Diode: RB461F (Schottky type) of Rohm Co., Ltd. Capacitor: F93 (16 V, 47 F tantalum type) of Nichicon Corporation Transistor: CPH31 of Sanyo Electric Co., Ltd. Base resistor (R b ): 1. k Base capacitor (C b ): pf (ceramic type) V IN = V OUT(S).6 applied, I OUT = V OUT(S) / 5 With shutdown function : ON / OFF pin is connected to V OUT For V DD / V OUT separate type : VDD pin is connected to VOUT pin Remark 1. V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage.. V DD / V OUT separate type A step-up operation is performed from V DD =.8 V. However, 1.8 V V DD 1 V is recommended stabilizing the output voltage and oscillation frequency. (V DD 1.8 V must be applied for products with a set value of less than 1.9 V.) 18

19 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ (4) 6 khz Product (N Type) Table 1 (Ta = 5C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT V OUT(S) V OUT(S) V OUT(S) V Input voltage V IN 1 V Operation start voltage V ST1 I OUT = 1 ma.9 V Oscillation start voltage V ST No external parts, Voltage applied to V OUT.8 V 1 Operation holding voltage V HLD I OUT = 1 ma, Judged by decreasing V IN voltage gradually.7 V S-835xx15 to A 1 S-835xx to A 1 Current consumption 1 I SS1 V OUT = V OUT(S).95 S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 S-835xx15 to A 1 S-835xx to A 1 Current consumption I SS V OUT = V OUT(S).5 V S-835xx3 to A 1 S-835xx4 to A 1 S-835xx5 to A 1 S-835xx6 to A 1 Current consumption during I shutdown SSS V = V ON/ OFF.5 A 1 S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTH V EXT = V OUT.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 EXT pin output current S-835xx6 to ma 1 S-835xx15 to ma 1 S-835xx to ma 1 S-835xx5 to ma 1 I EXTL V EXT =.4 V S-835xx3 to ma 1 S-835xx4 to ma 1 S-835xx5 to ma 1 S-835xx6 to ma 1 Line regulation V OUT1 V IN = V OUT(S).4 to mv Load regulation V OUT I OUT = 1 A to V OUT(S) / mv Output voltage temperature VOUT coefficient Ta VOUT Ta = 4 to 85C 5 ppm / C Oscillation frequency f OSC V OUT = V OUT(S) khz 1 Maximum duty ratio MaxDuty V OUT = V OUT(S) % 1 PWM / PFM switching duty ratio (For S-8356/58 Series) PFMDuty V IN = V OUT(S).1 V, No-load % 1 V SH Measured oscillation at EXT pin.75 V 1 ON / OFF pin input voltage V SL1 Judged oscillation stop at At V OUT 1.5 V.3 V 1 V SL EXT pin At V OUT 1.5 V. V 1 ON / OFF pin input current I SH I SL V = V ON/ OFF OUT(S) A 1 V = V ON/ OFF.1.1 A 1 Soft start time t SS ms Efficiency EFFI 85 % 19

20 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ External parts Coil: CDRH6D8-1 of Sumida Corporation Diode: RB461F (Schottky type) of Rohm Co., Ltd. Capacitor: F93 (16 V, 47 F tantalum type) of Nichicon Corporation Transistor: CPH31 of Sanyo Electric Co., Ltd. Base resistor (R b ): 1. k Base capacitor (C b ): pf (ceramic type) V IN = V OUT(S).6 applied, I OUT = V OUT(S) / 5, ON / OFF = V OUT Remark V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage.

21 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ (5) 6 khz Product (P and Q types) Table (Ta = 5C unless otherwise specified) Item Symbol Condition Min. Typ. Max. Unit Measurement circuit Output voltage V OUT V OUT(S) V OUT(S) V OUT(S) V 4 Input voltage V IN 1 V 4 Operation start voltage V ST1 I OUT = 1 ma.9 V 4 Oscillation start voltage V ST No external parts, Voltage applied to V DD.8 V 3 Operation holding voltage V HLD I OUT = 1 ma, Judged by decreasing V IN voltage gradually.7 V 4 Current consumption 1 I SS1 V DD = 3.3 V A 3 Current consumption I SS V DD = 3.3 V A 3 Current consumption during shutdown I SSS V = V ON/ OFF.5 A 3 (With shutdown function) EXT pin output current I EXTH V DD = 3.3 V ma 3 I EXTL V DD = 3.3 V ma 3 Line regulation V OUT1 V IN = V OUT(S).4 to mv 4 Load regulation V OUT I OUT = 1 A to V OUT(S) / mv 4 Output voltage temperature VOUT coefficient Ta VOUT Ta = 4 to 85C 5 ppm / C 4 Oscillation frequency f OSC V DD = 3.3 V khz 3 Maximum duty ratio MaxDuty V DD = 3.3 V % 3 PWM / PFM switching duty ratio (For S-8356/58 Series) PFMDuty V IN = V OUT(S).1 V, No-load % 3 ON / OFF pin input voltage (With shutdown function) ON / OFF pin input current (With shutdown function) V SH Measured oscillation at EXT pin.75 V 3 V SL1 Judged oscillation stop at At V OUT 1.5 V.3 V 3 V SL EXT pin At V OUT 1.5 V. V 3 I SH V = V ON/ OFF OUT(S) A 3 I SL V = V ON/ OFF.1.1 A 3 Soft start time t SS ms 4 Efficiency EFFI 85 % 4 External parts Coil: CDRH6D8-1 of Sumida Corporation Diode: RB461F (Schottky type) of Rohm Co., Ltd. Capacitor: F93 (16 V, 47 F tantalum type) of Nichicon Corporation Transistor: CPH31 of Sanyo Electric Co., Ltd. Base resistor (R b ): 1. k Base capacitor (C b ): pf (ceramic type) V IN = V OUT(S).6 applied, I OUT = V OUT(S) / 5, ON / OFF = V OUT Remark 1. V OUT(S) specified above is the set output voltage value, and V OUT is the typical value of the actual output voltage.. V DD / V OUT separate type A step-up operation is performed from V DD =.8 V. However, 1.8 V V DD 1 V is recommended stabilizing the output voltage and oscillation frequency. (V DD 1.8 V must be applied for products with a set value of less than 1.9 V.) 1

22 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Measurement Circuits 1. Oscilloscope *1 ON / OFF EXT VSS VOUT VDD *.1 F A Figure 9. C D VSS R b EXT VOUT VDD * ON / OFF *1.1 F V Figure 1 3. Oscilloscope *1 ON / OFF EXT VSS VOUT VDD A.1 F Figure C D VSS R b EXT VOUT VDD ON / OFF *1.1 F V Figure 1 *1. With shutdown function *. For V DD / V OUT separate type

23 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Operation 1. Switching Control Types 1.1 PWM Control (S-8355/57 Series) The S-8355/57 Series is a DC-DC converter using a pulse width modulation method (PWM) and features a low current consumption. In conventional PFM DC-DC converters, pulses are skipped when the output load current is low, causing a fluctuation in the ripple frequency of the output voltage, resulting in an increase in the ripple voltage. The switching frequency does not change, although the pulse width changes from to 83% (78% for F, G, H, J, L, M, N, P and Q types) corresponding to each load current. The ripple voltage generated from switching can thus be removed easily through a filter because the switching frequency is constant. 1. PWM/PFM Switching Control (S-8356/58 Series) S-8356/58 Series is a DC-DC converter that automatically switches between a pulse width modulation method (PWM) and a pulse frequency modulation method (PFM), depending on the load current, and features low current consumption. The S-8356/58 Series operates under PWM control with the pulse width duty changing from 15 to 83% (78% for F, G, H, J, L, M, N, P and Q types) in a high output load current area. The S-8356/58 Series operates under PFM control with the pulse width duty fixed at 15%, and pulses are skipped according to the load current. The oscillation circuit thus oscillates intermittently so that the resultant lower self current consumption prevents a reduction in the efficiency at a low load current. The switching point from PWM control to PFM control depends on the external devices (coil, diode, etc.), input voltage and output voltage. This series are an especially highly efficient DC-DC converter at an output current around 1 A.. Soft Start Function For this IC, the built-in soft start circuit controls the rush current and overshoot of the output voltage when powering on or when the ON / OFF pin is switched to the H level. 3

24 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 3. ON/ OFF Pin (Shutdown Pin) (SOT-3-5 Package Products of B, H, F, K, L, M, N and Q Types) ON / OFF pin stops or starts step-up operation. Setting the ON / OFF pin to the L level stops operation of all the internal circuits and reduces the current consumption significantly. DO NOT use the ON / OFF pin in a floating state because it has the structure shown in Figure 13 and is not pulled up or pulled down internally. DO NOT apply a voltage of between.3 V and.75 V to the applying such a voltage increases the current consumption. If the pin. The ON / OFF pin does not have hysteresis. ON / OFF pin because ON / OFF pin is not used, connect it to the VOUT Table 3 ON / OFF pin CR oscillation circuit Output voltage H Operation Fixed L Stop *1 V IN *1. Voltage obtained by subtracting the voltage drop due to the DC resistance of the inductor and the diode forward voltage from V IN. VOUT *1 ON / OFF VSS *1. VDD for K, L, M and Q types. Figure 13 ON/ OFF Pin Structure 4

25 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 4. Operation The following are the basic equations [(1) through (7)] of the step-up switching regulator. (Refer to Figure 14.) VIN L CONT D M1 EXT VOUT VSS C L Figure 14 Step-Up Switching Regulator Circuit for Basic Equation Voltage at CONT pin at the moment M1 is turned ON (V A ) *1 : V A = V S * (1) *1. Current flowing through L (I L ) is zero. *. Non-saturated voltage of M1. The change in I L over time : dil VL VIN VS () dt L L Integration of equation () (I L ) : VIN VS IL t (3) L I L flows while M1 is ON (t ON ). The time of t ON is determined by the oscillation frequency of OSC. The peak current (I PK ) after t ON : VIN VS IPK ton (4) L The energy stored in L is represented by 1/ L (I PK ). When M1 is turned OFF (t OFF ), the energy stored in L is emitted through a diode to the output capacitor. Then, the reverse voltage (V L ) is generated : V L = (V OUT V D *1 ) V IN (5) *1. Diode forward voltage The voltage at CONT pin rises only by V OUT V D. The change in the current (I L ) flowing through the diode into V OUT during t OFF : dil VL VOUT VD VIN (6) dt L L 5

26 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Integration of the equation (6) is as follows : VOUT VD VIN IL IPK t (7) L During t ON, the energy is stored in L and is not transmitted to V OUT. When receiving the output current (I OUT ) from V OUT, the energy of the capacitor (C L ) is consumed. As a result, the pin voltage of C L is reduced, and goes to the lowest level after M1 is turned ON (t ON ). When M1 is turned OFF, the energy stored in L is transmitted through the diode to C L, and the voltage of C L rises rapidly. V OUT is a time function, and therefore indicates the maximum value (ripple voltage (V PP ) ) when the current flowing through into V OUT and load current (I OUT ) match. Next, the ripple voltage is determined as follows. I OUT vs. t 1 (time) from when M1 is turned OFF (after t ON ) to when V OUT reaches the maximum level : VOUT VD VIN IOUT IPK t1 (8) L L t 1 (IPK IOUT ) (9) VOUT VD VIN When M1 is turned OFF (t OFF ), I L = (when the energy of the inductor is completely transmitted). Based on equation (7) : L t OFF VOUT VD V (1) IN IPK When substituting equation (1) for equation (9) : I OUT t1 toff toff I (11) PK Electric charge Q 1 which is charged in C L during t 1 : t1 t1 V t1 OUT VD VIN VOUT VD VIN 1 Q1 ILdt IPK dt tdt IPK t1 t1 L (1) L When substituting equation (1) for equation (9) : 1 IPK IOUT Q1 IPK I PK IOUT t1 t1 (13) A rise in voltage (V PP ) due to Q 1 : Q1 1 IPK IOUT VP P t1 (14) C C L L When taking into consideration I OUT to be consumed during t 1 and the Equivalent Series Resistance (R ESR ) of C L : Q1 1 IPK IOUT IPK IOUT IOUT t1 VP P t1 RESR (15) C C C L L When substituting equation (11) for equation (15) : V (IPK IOUT ) toff IPK IOUT P P RESR (16) IPK CL Therefore to reduce the ripple voltage, it is important that the capacitor connected to the output pin has a large capacity and a small R ESR. L 6

27 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ External Parts Selection The relationship between the major characteristics of the step-up circuit and the characteristics parameters of the external parts are shown in Figure 15. For higher efficiency? For larger output current? Operation efficiency Stand-by efficiency For smaller ripple voltage? Smaller inductance Larger inductance Smaller direct current resistance of inductor Larger output capacitance Larger output capacitance With MOS FET, smaller ON resistance With MOS FET, smaller input capacitance With bipolar transistor, smaller external resistance R b With bipolar transistor, larger external resistance R b Figure 15 Relationship between Major Characteristics of Step-up Circuit and External Parts 7

28 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 1. Inductor The inductance value (L value) has a strong influence on the maximum output current (I OUT ) and efficiency (). Figure 16 shows the relationship between the I OUT and dependency on L of S-8355/56/57/58 series. F, G, H, J, L and M types CDRH6D8, V OUT = 5. V, V IN = 3. V Efficiency decreases I OUT decreases I PK increases Coil size : smaller I OUT Recommended range L value (H) Efficiency decreases I OUT decreases I PK decreases Coil size : bigger Figure 16 L Value vs. I OUT Characteristics, L Value vs. Characteristics The peak current (I PK ) increases by decreasing L value and the stability of the circuit improves and I OUT increases. If L value is decreased, the efficiency falls causing a decline in the current drive capacity for the switching transistor, and I OUT decreases. The loss of I PK by the switching transistor decreases by increasing L value and the efficiency becomes maximum at a certain L value. Further increasing L value decreases the efficiency due to the loss of the direct current resistance of the coil. I OUT also decreases. A higher oscillation frequency allows selection of a lower L value, making the coil smaller. The recommended inductances are a to 1 H for B, E, and K types, a 4.7 to 47 H for F, G, H, J, L, and M types, 3. to H for N, P and Q types. Be careful of the allowable inductor current when choosing an inductor. Exceeding the allowable current of the inductor causes magnetic saturation, much lower efficiency and destruction of the IC chip due to a large current. Choose an inductor so that I PK does not exceed the allowable current. I PK in discontinuous mode is calculated by the following equation: IOUT (VOUT VD VIN) IPK (A) (17) f L OSC f osc = oscillation frequency, V D.4 V.. Diode Use an external diode that meets the following requirements : Low forward voltage : V F.3 V High switching speed : 5 ns max. Reverse voltage : V OUT V F or more Current rate : I PK or more 8

29 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 3. Capacitor (C IN, C L ) A capacitor on the input side (C IN ) improves the efficiency by reducing the power impedance and stabilizing the input current. Select a C IN value according to the impedance of the power supply used. A capacitor on the output side (C L ) is used for smoothing the output voltage. For step-up types, the output voltage flows intermittently to the load current, so step-up types need a larger capacitance than step-down types. Therefore, select an appropriate capacitor in accordance with the ripple voltage, which increases in case of a higher output voltage or a higher load current. The capacitor value should be 1 F or more. Select an appropriate capacitor the equivalent series resistance (R ESR ) for stable output voltage. The stable voltage range in this IC depends on the R ESR. Although the inductance value (L value) is also a factor, an R ESR of 3 to 5 m maximizes the characteristics. However, the best R ESR value may depend on the L value, the capacitance, the wiring, and the applications (output load). Therefore, fully evaluate the R ESR under the actual operating conditions to determine the best value. Refer to the 3. Example of Ceramic Capacitor Application (Figure 6) in the Application Circuit for the circuit example using a ceramic capacitor and the external resistance of the capacitor (R ESR ). 4. External Transistor An enhancement (N-channel) MOS FET type or A bipolar (NPN) type can be used as the external transistor. 4.1 Enhancement (N-channel) MOS FET Type Figure 17 is a circuit example using a MOS FET transistor (N-channel). V OUT VSS EXT VDD *1 * ON / OFF VOUT *1. For V DD / V OUT separate type. *. With shutdown function. Figure 17 Circuit Example Using MOS FET (N-channel) Type An N-channel power MOS FET should be used for the MOS FET. Because the gate voltage and current of the external power MOS FET are supplied from the stepped-up output voltage (V OUT ), the MOS FET is driven more effectively. A large current may flow during startup, depending on the MOS FET selection. So perform sufficient evaluation using the actual devices. Also recommend to use a MOS FET with an input capacitance of 7 pf or less. Since the ON-resistance of the MOS FET might depend on the difference between the output voltage (V OUT ) and the threshold voltage of the MOS FET, and affect the output current as well as the efficiency, the threshold voltage should be low. When the output voltage is low, the circuit operates only when the MOS FET has a threshold voltage lower than the output voltage. 9

30 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 4. Bipolar (NPN) Type A circuit example using the CPH31 (h FE = to 56) from Sanyo Electric Co., Ltd. As a bipolar transistor (NPN) is shown in Figure 19 to 4 in the Standard Circuits. The h FE value and R b value of the bipolar transistor determine the driving capacity to increase the output current using a bipolar transistor. A peripheral circuit example of the transistor is shown in Figure 18. Pch VOUT *1 C b pf I PK Nch EXT R b 1 k *1. V DD for E, G, J, K, L, M, P and Q types. Figure 18 External Transistor Peripheral Circuit The recommended R b value is around 1 k. Actually, calculate the necessary base current (I b ) from the bipolar IPK VOUT.7.4 transistor (h FE ) using Ib, and select the smaller R b value than Rb *1. hfe Ib IEXTH A small R b value can increase the output current, but the efficiency decreases. Since a current may flow on the pulse and the voltage may drop due to wiring resistance or other factors in the actual circuit, therefore the optimum R b value should be determined by experiment. Connecting the speed-up capacitor (C b ) in parallel with the R b resistance as shown in Figure 18, decreases switching loss and improves the efficiency. 1 The C b value is calculated according to Cb π Rb fosc.7. Select a C b value after performing sufficient evaluation since the optimum C b value differs depending upon the characteristics of the bipolar transistor. *1. For E, G, J, K, L, M, P and Q type, R V.7.4 DD b. Ib IEXTH 3

31 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ 5. V DD / V OUT Separate Type (For E, G, J, K, L, M, P and Q Types) The E, G, J, K, L, M, P and Q types provides separate internal circuit power supply (VDD pin) and output voltage setting pin (VOUT pin) in the IC, making it ideal for the following applications. (1) When changing the output voltage with external resistance. () When outputting a high voltage such as 15 V or V. Choose the products in the Table 4 according to the applications (1) or () above. Table 4 Output Voltage (V CC ) 1.8 V V CC 5 V 5 V V CC Reference Circuit S-835xx18 Yes Yes Application circuit 1 (Figure 5) S-835xx5 Yes Application circuit 1 (Figure 5) Connection to VDD pin V IN or V CC V IN Cautions 1. This IC starts a step-up operation at V DD =.8 V, but set 1.8 V DD 1 V to stabilize the output voltage and frequency of the oscillator. (Input a voltage of 1.8 V or more at the VDD pin for all products with a setting less than 1.9 V.) An input voltage of 1.8 V or more at the VDD pin allows connection of the VDD pin to either the input voltage VIN pin or output VOUT pin.. Choose external resistors R A and R B so as to not affect the output voltage, considering that there is impedance between the VOUT pin and VSS pin in the IC chip. The internal resistance between the VOUT pin and VSS pin is as follows : (1) S-835xx18 :.1 to 14.8 M () S-835xx : 1.4 to 14.8 M (3) S-835xx3 : 1.4 to 14. M (4) S-835xx5 : 1.4 to 1.1 M 3. Attach a capacitor (C C ) in parallel to the R A resistance when an unstable event such as oscillation of the output voltage occurs. Calculate C C using the following equation : 1 C C F R khz A 31

32 STEP-UP, SUPER-SMALL PACKAGE, 6 khz, PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER Rev.8.1_ Standard Circuits (1) S-8357BxxMA, S-8357BxxUA, S-8358BxxMA, S-8358BxxUA SD VOUT V IN C IN pf 1 K EXT Oscillation circuit PWM control circuit or PWM / PFM switching control circuit Soft start built-in reference power supply IC internal power supply Phase compensating circuit VSS C L Remark The power supply for the IC chip is from the VOUT pin. Figure 19 () S-8357BxxMC, S-8357FxxMC, S-8357HxxMC, S-8357NxxMC, S-8358BxxMC, S-8358FxxMC, S-8358HxxMC, S-8358NxxMC V IN C IN L pf 1 K EXT SD Oscillation circuit PWM control circuit or PWM / PFM switching control circuit IC internal power supply VOUT C L Soft start built-in reference power supply Phase compensating circuit VSS ON / OFF Remark The power supply for the IC chip is from the VOUT pin. Figure (3) S-8357ExxMC, S-8357GxxMC, S-8357JxxMC, S-8357PxxMC, S-8358ExxMC, S-8358GxxMC, S-8358JxxMC, S-8358PxxMC V IN C IN L pf 1 K EXT SD Oscillation circuit PWM control circuit or PWM / PFM switching control circuit VDD IC internal power supply C C VOUT R A R B C L Soft start built-in reference power supply Phase compensating circuit VSS Remark The power supply for the IC chip is from the VDD pin. Figure 1 3