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LT1372 Datasheet(PDF) 1 Page - Linear Technology |
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LT1372 Datasheet(HTML) 1 Page - Linear Technology |
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1 LT1372/LT1377 500kHz and 1MHz High Efficiency 1.5A Switching Regulators s Boost Regulators s CCFL Backlight Driver s Laptop Computer Supplies s Multiple Output Flyback Supplies s Inverting Supplies APPLICATIONS The LT ®1372/LT1377 are monolithic high frequency switching regulators. They can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and “Cuk.” A 1.5A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry. All functions of the LT1372/LT1377 are integrated into 8-pin SO/PDIP packages. The LT1372/LT1377 typically consumes only 4mA quies- cent current and has higher efficiency than previous parts. High frequency switching allows for very small inductors to be used. All surface mount components consume less than 0.5 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. DESCRIPTION s Faster Switching with Increased Efficiency s Uses Small Inductors: 4.7 µH s All Surface Mount Components s Only 0.5 Square Inch of Board Space s Low Minimum Supply Voltage: 2.7V s Quiescent Current: 4mA Typ 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 FEATURES , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION 12V Output Efficiency OUTPUT CURRENT (A) 0.01 50 60 70 80 90 0.1 1 LT1372 • TA02 100 VIN = 5V 5V-to-12V Boost Converter LT1372/LT1377 VIN VC 5V 1 2 8 5 4 6, 7 GND FB LT1372 • TA01 VSW S/S L1* 4.7 µH C1** 22 µF C4** 22 µF C2 0.047 µF C3 0.0047 µF R3 2k R2 6.19k 1% R1 53.6k 1% VOUT † 12V D1 MBRS120T3 ON OFF *COILCRAFT DO1608-472 (4.7 µH) OR COILCRAFT DT3316-103 (10 µH) OR SUMIDA CD43-4R7 (4.7 µH) OR SUMIDA CD73-100KC (10 µH) OR **AVX TPSD226M025R0200 L1 4.7 µH 10 µH IOUT 0.25A 0.35A †MAX IOUT + + |
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