LT1305

LT1305 Micropower High Power DC/DC Converter with Low-Battery Detector FEATURES s s s s s s s DESCRIPTIO 5V at 400mA from 2V Input Supply Voltage As Low As 1.8V 120µA Quiescent Current Low-Battery Detector Low VCESAT Switch: 310mV at 2A Typ Uses Inexpensive Surface Mount Inductors 8-Lead SO Package The LT ®1305 is a micropower step-up DC/DC converter that uses Burst ModeTM operation. Similar to the LT1303, the LT1305 features a 2A internal low-loss switch and can deliver up to four times the output power of the LT1303. Quiescent current is only 120µA and the Shutdown pin further reduces current to 10µA. A low-battery detector provides an open-collector output that goes low when the input voltage drops below a preset level. The LT1305 is available in an 8-pin SO, easing board space requirements. , LTC and LT are registered trademarks of Linear Technology Corporation. Burst Mode is a trademark of Linear Technology Corporation APPLICATI s s s S 2-Cell and 3-Cell to 5V Conversion EL Panel Drivers Portable Instruments TYPICAL APPLICATI 2-Cell and 3-Cell to 5V/400mA DC/DC Converter with Low-Battery Detect L1 10µH 316k 1% 2 TO 3 CELLS 90 D1 LOW BATTERY GOES LOW AT VBAT = 2.2V VIN = 4.00V EFFICIENCY (%) VIN LBI LT1305 SHDN GND SW LBO 100k 301k 1% + C1 220µF 412k 1% SHUTDOWN FB PGND C2 100k 220µF 1% + VOUT 5V 400mA C1, C2: AVX TPSE227010R0100 D1: MOTOROLA MBRS130LT3 L1: COILCRAFT D03316-103 LT1305 TA03 U Efficiency 80 VIN = 3.00V VIN = 2.00V VIN = 2.50V 70 60 1...