SC1563. Very Low Dropout, Low Quiescent 500mA Regulator POWER MANAGEMENT. Applications. Typical Application Circuits
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1 Description The SC1563 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 5mA. Since it has superior dropout characteristics compared to regular LDOs, it can be used to supply 2.5 on motherboards or 2.8 on peripheral cards from the 3.3 supply with no heatsink. Additionally, the SC1563 has a shutdown pin to further reduce power dissipation while shut down. The SC1563 provides excellent regulation over variations in line, load and temperature. A wide range of fixed output voltage options are available. In addition, the output voltage of every device can be adjusted between 1.2 and 4.8 using external resistors. The SC1563 comes in the space saving 5-pin SOT- 23 package. Typical Application Circuits Internally Preset Output oltage SC1563 ery Low Dropout, Low Quiescent 5mA Regulator Features 35m 5mA Designed to operate with ceramic capacitors Adjustable output from 1.2 to 4.8 Multiple output voltage options all parts also adjustable externally using resistors) Over current and over temperature protection 2µA quiescent current in shutdown No minimum load current requirement Low reverse leakage output to input) Full industrial temperature range 5-pin SOT-23 surface mount package. Also available in Lead-free, fully WEEE and RoHS compliant Applications Personal Digital Assistants Battery powered systems Motherboards Peripheral cards PCMCIA cards Externally Set Output oltage IN SHDN 5 1 U1 SC1563IS-X.X IN SHDN GND ADJ 4 O X.X) IN SHDN 5 1 U1 SC1563IS-X.X IN SHDN GND ADJ 4 R1 O C1 2 3 C2 C1 2 3 C2 R2 1.2R1+ R2) = olts R2 Revision: January 11, 26 1
2 Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Input oltage Symbol Shutdown oltage SHDN Maximum IN.3 to 7 Units to I N Power Dissipation P D Internally Limited 1) T hermal Resistance Junction to Ambient Operating Operating Storage Ambient Junctio n Temperature Range θ JA 75 W 1 C/ W Temperature Range T A -4 to 85 C Temperature Range T J -4 to 15 C Lead Temperature Soldering) 1 sec T EAD T STG 65 to 15 L - C 3 C ESD Rating ESD 2 k Note: 1) Minimum pad size. Electrical Characteristics Unless specified: SHDN =, Adjustable mode ADJ > THADJ) ): IN = 2.2 to 5.5 and I = A to 5mA, Fixed mode ADJ = GND): IN = +.7) to 5.5 and I = A to 5mA. alues in bold apply over full operating temperature range. Parameter Symbol Conditions Min Typ Max Units IN Supply oltage Range IN Quiescent Current I Q IN = µ A IN = 6.5, = Open.1 2. µ A SHDN 1) O utput oltage Internal Fixed oltage) IN = O UT +.7, I = 1mA -1% UT O 1% - 2% +2% + 1) L ine Regulation 1) L oad Regulation R EG LINE ) IN = +.25) to 5.5, I R EG LOAD) IN = O UT = 1mA %.4 % 26 Semtech Corp. 2
3 Electrical Characteristics Unless specified: SHDN =, Adjustable mode ADJ > THADJ) ): IN = 2.2 to 5.5 and I = A to 5mA, Fixed mode ADJ = GND): IN = +.7) to 5.5 and I = A to 5mA. alues in bold apply over full operating temperature range. Parameter Symbol Conditions Min Typ Max Units Cont.) 1)2) D ropout oltage D I = 2mA 1 5 m I I O UT I = 1mA = 25mA 75 = 5mA m m m 7 Current ADJ Limit I LIM A 1) R eference oltage REF IN = 2.2, = I ADJ, = 1mA Adjust Pin Current 3) 4) A djust Pin Threshold SHDN Shutdown Pin Current I HDN Shutdown Pin Threshold Over Temperature Protection High Trip Level I ADJ ADJ = 5 REF.1 THADJ) S SHDN =, I N IH IL Hysteresis T YS T IN IN = na µ A = = T HI 7 H 1 C 1 C Notes: 1) Low duty cycle pulse testing with Kelvin connections required. 2) Defined as the input to output differential at which the output voltage drops to 1% below the value measured at a differential of.7 for Not measurable on outputs less than 2.2 due to minimum IN constraints. See typical characteristics curves. 3) Guaranteed by design. 4) When ADJ exceeds this threshold, the Sense Select switch disconnects the internal feedback chain from the error amplifier and connects ADJ instead. 26 Semtech Corp. 3
4 Pin Configurations Top iew Ordering Information 1)2)3) P art Number Package SC1563ISK-X.XTR 4) S C1563ISK-X.XTRT SOT-23-5 SOT-23-5 Notes: 1) Where -X.X denotes voltage options. Available voltages are: 1.8, 2.5, 2.8, 3., 3.1 and ) Output voltage can be adjusted using external resistors, see Pin Descriptions. 3) Only available in tape and reel packaging. A reel contains 3 devices. 4) Lead free product. This product is fully WEEE and RoHS compliant. Marking Information SOT XX = SC1563, voltage option example: 6318 for 1.8 option) yyww = Date code example: 8 for week 8 of 2) 26 Semtech Corp. 4
5 Block Diagram Pin Descriptions Pin # Pin Name Pin Function 1 SHDN Shutdown Input. Leaving this pin open turns the regulator off, reducing the quiescent current to a fraction of its operating value typically < 3nA). The device will be enabled if this pin is pulled below.4. Connect to GND if not being used. 2 G ND Reference ground. This pin may be used for heatsinking purposes. 3 ADJ This pin, when grounded, sets the output voltage to that set by the internal feedback resistors. If external feedback resistors are used, the output voltage will be See Application Circuit on page 1): 1.2R1+ R2) = olts R2 4 O UT This pin is the power output of this device, sourcing up to 5mA. 5 IN Input voltage. For regulation at Minimum = 2.2. I N full load, the input to this pin must be between +.7) and 6.5. O UT 26 Semtech Corp. 5
6 Applications Information Introduction The SC1563 is intended for applications such as graphics cards where high current capability and very low dropout voltage are required. It provides a very simple, low cost solution that uses little pcb real estate. Additional features include a shutdown pin to allow for a very low power consumption standby mode, and a fully adjustable output. Component Selection Input capacitor - a 1µF ceramic capacitor is recommended. This allows for the device being some distance from any bulk capacitance on the rail. Additionally, input droop due to load transients is reduced, improving load transient response. Additional capacitance may be added if required by the application. Output capacitor - a minimum bulk capacitance of 1µF, along with a.1µf ceramic decoupling capacitor is recommended. Increasing the bulk capacitance will improve the overall transient response. The use of multiple lower value ceramic capacitors in parallel to achieve the desired bulk capacitance will not cause stability issues. Although designed for use with ceramic output capacitors, the SC1563 is extremely tolerant of output capacitor ESR values and thus will also work comfortably with tantalum output capacitors. Noise immunity - in very electrically noisy environments, it is recommended that.1µf ceramic capacitors be placed from IN to GND and to GND as close to the device pins as possible. Thermal Considerations The power dissipation in the SC1563 is approximately equal to the product of the output current and the input to output voltage differential: P D IN ) I The absolute worst-case dissipation is given by: P DMAX) = INMAX ) MIN) ) IMAX ) + INMAX ) IQMAX ) For a typical scenario, IN = 3.3 ± 5%, = 2.5 and I = 5mA, therefore: INMAX) = 3.465, MIN) = 2.45 and I QMAX) = 15µA, Thus P DMAX) =.58W. Using this figure, and assuming T AMAX) = 7 C, we can calculate the maximum thermal impedance allowable to maintain T J 15 C: R TJMAX) TAMAX) ) 15 7) TH J A )MAX) = = PDMAX).58 = 157 C / W This should be achievable with the SOT-23-5 package using pcb copper area to aid in conducting the heat away from the device. Internal ground/power planes and air flow will also assist in removing heat. External voltage selection resistors - the use of 1% resistors, and designing for a current flow 1µA is recommended to ensure a well regulated output thus R2 12kΩ). 26 Semtech Corp. 6
7 Typical Characteristics Quiescent Current vs. Junction Temperature vs. Output Current 15 IN = 3.3, ADJ = Quiescent Current vs. Input oltage vs. Output Current ADJ = 1 I = 5mA 1 I Q µa) 75 I = ma I Q µa) I = 5mA I = ma Deviation % NOM) ) REG LOAD % NOM) ) Output oltage vs. Junction Temperature vs. Output Current IN = NOM) +.7 I = ma I = 5mA IN = NOM) +.7 I = ma to 5mA Load Regulation vs. Junction Temperature. REG LINE % NOM) ) D m) IN ) Line Regulation vs. Junction Temperature vs. Input oltage Change IN = NOM) +.25) to 5.5 I = 1mA Dropout oltage I =.5A) vs. Output oltage vs. Junction Temperature T J = 15 C T J = 25 C T J = -4 C ) 26 Semtech Corp. 7
8 Typical Characteristics Cont.) 4 Dropout oltage I =.25A) vs. Output oltage vs. Junction Temperature 15 Dropout oltage I =.1A) vs. Output oltage vs. Junction Temperature D m) T J = 15 C T J = 25 C T J = -4 C D m) T J = 15 C T J = 25 C T J = -4 C REF ) I LIM ma) ) Current Limit vs. Junction Temperature 1 IN = NOM) Reference oltage IN = 5.5) vs. Junction Temperature vs. Output Current 1.21 IN = I = ma I = 5mA REF ) I ADJ na) ) Reference oltage IN = 2.2) vs. Junction Temperature vs. Output Current IN = 2.2 I = ma I = 5mA IN = 6.5 ADJ = REF Adjust Pin Current vs. Junction Temperature 26 Semtech Corp. 8
9 Typical Characteristics Cont.) THADJ) m) Adjust Pin Threshold oltage vs. Junction Temperature IN I SHDN µa) Shutdown Pin Current vs. Junction Temperature IN = 3.3 SHDN =. Shutdown Pin Threshold oltage vs. Junction Temperature vs. Input oltage IH, IN = IH, IL ) IL, IN = 6.5 IH, IN = IL, IN = Semtech Corp. 9
10 Outline Drawing - SOT X E/2 ccc 2X N/2 TIPS aaa C A N 1 2 B D e e1 EI D E DIMENSIONS INCHES MILLIMETERS DIM MIN NOM MAX MIN NOM MAX A A A b c D E E e.11 BSC.37 BSC 2.8 BSC.95 BSC e1.75 BSC 1.9 BSC L L1.24).6) N aaa.4.1 bbb.8.2 ccc.8.2 SEATING PLANE A2 A C A1 H bxn bbb C A-B D GAGE PLANE c.25 L L1) 1 SIDE IEW SEE DETAIL A DETAIL A NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern - SOT-23-5 X C) P G Y Z DIM C G P X Y Z DIMENSIONS INCHES MILLIMETERS.98) 2.5) Contact Information NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Semtech Corporation Power Management Products Division 2 Flynn Road, Camarillo, CA 9312 Phone: 85) FAX 85) Semtech Corp. 1
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