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LT1373HVIS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1373HVIS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LT1373 250kHz Low Supply Current High Efficiency 1.5A Switching Regulator s Boost Regulators s CCFL Backlight Driver s Laptop Computer Supplies s Multiple Output Flyback Supplies s Inverting Supplies The LT ®1373 is a low supply current high frequency current mode switching regulator. It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and “Cuk.” A 1.5A high effi- ciency switch is included on the die, along with all oscilla- tor, control and protection circuitry. All functions of the LT1373 are integrated into 8-pin SO/PDIP packages. Compared to the 500kHz LT1372, which draws 4mA of quiescent current, the LT1373 switches at 250kHz, typi- cally consumes only 1mA and has higher efficiency. High frequency switching allows for small inductors to be used. All surface mount components consume less than 0.6 square inch of board space. New design techniques increase flexibility and maintain ease of use. Switching is easily synchronized to an exter- nal logic level source. A logic low on the shutdown pin reduces supply current to 12 µA. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation tech- niques. Nonlinear error amplifier transconductance re- duces output overshoot on start-up or overload recovery. Oscillator frequency shifting protects external compo- nents during overload conditions. s 1mA IQ at 250kHz s Uses Small Inductors: 15 µH s All Surface Mount Components s Only 0.6 Square Inch of Board Space s Low Minimum Supply Voltage: 2.7V s Constant Frequency Current Mode s Current Limited Power Switch: 1.5A s Regulates Positive or Negative Outputs s Shutdown Supply Current: 12 µA Typ s Easy External Synchronization s 8-Pin SO or PDIP Packages , LTC and LT are registered trademarks of Linear Technology Corporation. OUTPUT CURRENT (mA) 1 70 80 90 10 100 1000 LT1373 • TA02 60 50 100 VIN = 5V f = 250kHz LT1373 VIN VC 5V 1 2 8 5 4 6, 7 SUMIDA CD75-220KC (22 µH) OR COILCRAFT D03316-153 (15 µH) AVX TPSD226M025R0200 GND FB LT1373 • TA01 VSW S/S L1* 22 µH C1** 22 µF C4** 22 µF C2 0.01 µF R3 5k R2 24.9k 1% R1 215k 1% * ** VOUT † 12V †MAX IOUT D1 MBRS120T3 ON OFF L1 15 µH 22 µH IOUT 0.3A 0.35A + + 5V-to-12V Boost Converter 12V Output Efficiency FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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