1A Adjustable/Fixed Low Dropout Linear Regulator. Figure 1. Typical Applications of IMP1117

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1 General Description The IMP1117-ADJ and IMP ,-1.5,-1.8,-2.5,-2.85, -3.3 and-5 are low dropout three-terminal regulators with 1A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in Active Terminators for SCSI bus. On-chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the IMP1117 flows into the load, increasing efficiency. The IMP1117 series regulators are available in the industry-standard SOT-223 and TO-252 power packages. Key Features - Low dropout voltage - Load regulation: 0.05% typical - Optimized for Low Voltage - On-chip thermal limiting - Standard SOT-223 and TO-252 packages - Three-terminal adjustable or fixed low dropout 1.2V,1.5V,1.8V, 2.5V, 2.85V, 3.3V, 5V. Regulators Applications - Active SCSI terminators - High efficiency linear regulators - Post regulators for switching supplies - Battery chargers - 12V to 5V linear regulators - Motherboard clock supplies Typical Application Figure 1. Typical Applications of Notice: The distance between Vout pin and Capacitor should not exceed 4cm for excellent performance Daily Silver IMP 1

2 Pin Assignments Figure 2. Pin Assignments of *With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, Θ JA can vary from 30 C/W to more than 50 C/W. Other mounting techniques may provide better thermal resistance than 30 C/W. Absolute Maximum Ratings Parameter Min. Max. Unit VIN 18 V VIN VOUT) * IOUT See Figure 3 Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec.) 300 C C C IOUT A) V IN -V OUT (V) Figure 3. Absolute Maximum Safe Operating Area Daily Silver IMP 2

3 Block Diagram V IN Thermal Limit Current Limit V OUT GND (fixed output) ADJ. (adjustable output) Figure 4. Block Diagram of Substrate Electrical Characteristic Typicals and limits appearing in normal type apply for T J =2.Limits appearing in Boldface type apply over the entire junction temperature for operation,0 to 125 Symbol Parameter Conditions Min Typ Note 1) Max Units V REF Reference Voltage IMP V<=(V IN -V OUT )<=7V,10mA<=I OUT <=1A V I OUT = 10mA, V IN = 3.2V IMP ,2.7V<= V IN <=8.2V V IMP ,3.0V<= V IN <=8.5V V IMP ,3.3V<= V IN <=8.8V V V OUT Output Voltage 10mA<= I OUT <=1A IMP ,4V<= V IN <= 9.5V V IMP , 4.35V <= V IN <= 9.85V V IMP , 4.8V<= V IN <=10.3V V IMP ,6.5V<=V IN <= 12V V Daily Silver IMP 3

4 Electrical Characteristic (Continued) Typicals and limits appearing in normal type apply for T J =2.Limits appearing in Boldface type apply over the entire junction temperature for operation,0 to 125 Symbol Parameter Conditions Line Regultion Note 3) Min Typ Note 1) Max I OUT =10mA,(V OUT +1.5V)<=V IN <=12V Units V OUT Load Regultion Note 3) V IN -V OUT =2V,10mA<= I OUT <=1A, IMP V IN -V OUT =2V,10mA<= I OUT <=1A, V IN -V OUT Dropout Volage I OUT =1A, V REF =1% V Current Limit V IN -V OUT = 2V, TJ= A Minimum Load Current Note 4) IMP1117-ADJ 1.5V<=(V IN -V OUT )<=10V 10 ma Quiescent Curent V IN =V OUT +1.25V 5 13 ma I Limit Thermal Regulation Ripple Rejection T A = 25 C, 30ms pulse W f=120hz,v IN -V OUT =3V, V Ripple =1V PP db Adjust Pin Current µa Adjust Pin Current Change Temperature Stability Long Term Stability 1.5V<=V IN -V OUT <=7V, 10mA<=I OUT <=1A µa 0.5 TA = 125 C, 1000hrs. 0.3 Daily Silver IMP 4

5 Electrical Characteristic (Continued) Typicals and limits appearing in normal type apply for T J =2.Limits appearing in Boldface type apply over the entire junction temperature for operation,0 to 125 Symbol Parameter Conditions Min Typ Note 1) Max Units I Limit RMS Output Noise(% of V OUT ) Thermal Resistance, Junction to Case Note 1: Typical Values represent the most likely parametric norm. Note 2: All limits are guaranteed by testing or statistical analysis. Note 3: Load and line regulation are measured at constant junction room temperature. Note 4: The minimum output current required to maintain regulation. T A = 25 C, 10Hz<= f <=10kHz SOT /W TO W Thermal Shutdown Junction Temperature 155 Thermal Shutdown Hysteresis 25 Typical Performance Characteristics Dropout Voltage ( V ) Figure 5. Dropout Voltage VS. Output Current Output Current ( A ) 0.10 Output Voltage Deviation ( % ) Figure 6. Load Regulatioin VS. Temperature Daily Silver IMP 5

6 Typical Performance Characteristics (Continued) ReferenceVoltage( V ) Output Voltage( V ) 3.70 Figure 7. Reference Voltage VS. Temperature Figure 8. Output Voltage VS. Temperature Minimum Load Current( ma ) ADJ Pin Current( µa ) 100 Note: IMP1117 Only Figure 9. Minimum Load Current VS. Temperature Figure 10. ADJ Pin Current VS. Temperature Daily Silver IMP 6

7 Typical Performance Characteristics (Continued) 2.0 Short Circuit Current ( A ) Ripple Rejection ( db ) V IN -V OUT =3V 0.5V<V Ripple< 2V I OUT =1A K 10K 100K Frequency ( Hz ) Figure 11. Short-Circuit Current VS. Temperature Figure 12. Ripple Rejection VS. Temperature V IN =12V 10mA<I OUT <I MAX Power ( W )5 2.5 TO-252 SOT-223 Output Cap`s ESR ( mω ) Instability Region V IN =5V Region of Stability (SOA) Case Temperature ( ) V OUT ( V ) Figure 13. Maximum Power VS. Dissipation Figure 14. Stability Region (SOA) VS. the C OUT Daily Silver IMP 7

8 Mechanical Dimensions 4-Lead SOT-223 Package Inches Millimeters Symbol Notes Min. Max. Min. Max. A Ñ 071 Ñ 1.80 A1 Ñ 181 Ñ 4.80 B c Ñ 0.90 Ñ 2.29 D E e F H I 0121 Ñ 310 Ñ J Ñ 10 Ñ 10 K L M N Figure Lead SOT-223 Package Daily Silver IMP 8

9 Mechanical Dimensions (Continued) 3-Lead TO-252 Package Inches Millimeters Symbol Notes Min. Max. Min. Max. A b b b c c D E e 090 BSC 2.29 BSC H L L1 108 REF 2.74 REF L L Notes: 1. Dimensions are exclusive of mold flash, metal burrs or interlead protrusion. 2. Stand off-height is measured from lead tip with ref. to Datum B-. 3. Foot length is measured with ref. to Datum A with lead surface. 4. Thermal pad contour optional within dimension b3 and L3. 5. Formed leads to be planar with respect to one another at seating place C-. 6. Dimensions and tolerances. Figure Lead TO-252 Package Daily Silver IMP 9

10 Ordering Information Package Temperature Range Part Number Output Voltage Packing Marking Transport Media SOT 223 TO IMP1117AS12X/T 1.2V 1117-S12 3K Tape and Reel IMP1117AS15X/T 1.5V 1117-S15 3K Tape and Reel IMP1117AS18X/T 1.8V 1117-S18 3K Tape and Reel IMP1117AS25X/T 2.5V 1117-S25 3K Tape and Reel IMP1117AS285/T 2.85V 1117-S28 3K Tape and Reel IMP1117AS33/T 3.3V 1117-S33 3K Tape and Reel IMP1117AS5X/T 5V 1117-S50 3K Tape and Reel IMP1117ASX/T Adjust 1117SADJ 3K Tape and Reel IMP1117AD12X/T 1.2V 1117-D12 2.5K Tape and Reel IMP1117AD15X/T 1.5V 1117-D15 2.5K Tape and Reel IMP1117AD18X/T 1.8V 1117-D18 2.5K Tape and Reel IMP1117AD25X/T 2.5V 1117-D25 2.5K Tape and Reel IMP1117AD285/T 2.85V 1117-D28 2.5K Tape and Reel IMP1117AD33/T 3.3V 1117-D33 2.5K Tape and Reel IMP1117AD5X/T 5V 1117-D50 2.5K Tape and Reel IMP1117ADX/T Adjust 1117DADJ 2.5K Tape and Reel ISO 9001 Registered Daily Silver IMP Microelectronics Co.,Ltd 7 keda Road,Hi-Tech Park, NingBo,Zhejiang,P.R.C Post Code: Tel:(086) Fax:(086) The IMP logo is a registered trademark of Daily Silver IMP. All other company and product names are trademarks of their respective owners Printed in china Revision: F Issue Date: 16th.May.08 Type: Product Daily Silver IMP 10

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