LT3464 Micropower Boost Converter with Schottky and Output Disconnect in ThinSOT™ UFEATURESDESCRIPTIO ■ Tiny Solution Size The LT®3464 is a micropower step-up DC/DC converter ■ Low Quiescent Current with integrated Schottky diode and output disconnect • 25 µ A in Active Mode packaged in an 8-lead low profile (1mm) SOT-23. The • 0.5 µ A in Shutdown Mode small package size, high level of integration, and the use ■ Internal 115mA, 36V Switch of tiny SMT components yield a solution size of less than ■ Integrated Schottky Diode 40mm2. The LT3464 has a typical current limit of 115mA ■ Integrated PNP Output Disconnect with as well as fast switching speed to allow the use of a chip Short-Circuit Protection inductor and small ceramic capacitors. The internal PNP ■ Internal Reference Override Pin disconnects the output load from the input during shut- ■ 16V at 8mA from 3.6V Input down, and also provides output short-circuit protection. ■ 12V at 20mA from 5V Input An auxiliary reference input allows the user to override the ■ Input Range: 2.3V to 10V internal 1.25V feedback reference with any lower value, ■ High Output Voltage: Up to 34V allowing full control of the output voltage during opera- ■ Low Profile (1mm) SOT-23 Package tion. This device features a low 25 µA quiescent current, U which is further reduced to less than 0.5µA in shutdown. APPLICATIO S A current limited fixed off-time control scheme conserves operating current, resulting in high efficiency over a broad ■ OEL Panel Bias range of operating current. The rugged 36V switch and ■ LCD Bias output disconnect circuitry allow outputs up to 34V to be ■ Handheld Computers easily generated in a simple boost topology. ■ Battery Backup , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Digital Cameras ThinSOT is a trademark of Linear Technolgy Corporation ■ Cellular Phones UTYPICAL APPLICATIOEfficiency 22µH VIN 90 2.3V TO 10V VIN = 8.4V 80 VIN SW V V IN = 4.2V OUT OUT 16V 70 CTRL 0.22µF 1µF LT3464 CAP 60 SHDN 0.33µF 3.48M EFFICIENCY (%) 50 FB GND 294k 40 3464 TA01a 300.01 0.1 1 10 100 LOAD CURRENT (mA) 3464 TA01b 3464f 1
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