LT3461 Datasheet | Linear Technology

LT3461/LT3461A 1.3MHz/3MHz Step-Up DC/DC Converters with Integrated Schottky in Thin SOT Features - - - - - - - - - - - DESCRIPTIO U APPLICATIO S Integrated Schottky Rectifier Fixed Frequency 1.3MHz/3MHz Operation High Output Voltage: Up to 38V Low VCESAT Switch: 260m V at 250m A 12V at 70m A from 5V Input 5V at 115m A from 3.3V Input Wide Input Range: 2.5V to 16V Uses Small Surface Mount ponents Low Shutdown Current: <1µA Soft-Start Low Profile (1mm) SOT-23 (Thin SOTTM) Package - - - - - - - Digital Cameras CCD Bias Supply XDSL Power Supply TFT-LCD Bias Supply Local 5V or 12V Supply Medical Diagnostic Equipment Battery Backup The LT®3461/LT3461A are general purpose fixed frequency current mode step-up DC/DC converters. Both devices feature an integrated Schottky and a low VCESAT switch allowing a small converter footprint and lower parts cost. The LT3461 switches at 1.3MHz while the LT3461A switches at 3MHz. These high switching frequencies enable the use of tiny, low cost and low height capacitors and inductors. The constant switching frequency results in predictable output noise that is easy to filter, and the inductor based topology ensures an input free from switching noise typically present with charge pump solutions. The high voltage switch in the LT3461/LT3461A is rated at 40V making the device ideal for boost converters up to 38V. The LT3461/LT3461A are available in a low profile (1mm) SOT-23 package. , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO L1 10µH 1 SW 6 5 VIN VOUT LT3461A 4 3 SHDN FB GND 2 5V to 12V, 70m A Step-Up DC/DC Converter VIN 5V C1 1µ F OFF ON EFFICIENCY (%) 261k 15p F VOUT 12V 70m A 30.1k C2 1µ F 3461 TA01a 60 0 20 60 40 LOAD CURRENT (m A) 80 3461 TAO1b Efficiency...