LTC3400B Datasheet | Linear Technology

LTC3400/LTC3400B 600m A, 1.2MHz Micropower Synchronous Boost Converter in Thin SOT Features s Up to 92% Efficiency s Generates 3.3V at 100m A from a Single AA Cell s Low Start-Up Voltage: 0.85V s 1.2MHz Fixed Frequency Switching s Internal Synchronous Rectifier s 2.5V to 5V Output Range s Automatic Burst Mode® Operation (LTC3400) s Continuous Switching at Light Loads (LTC3400B) s Logic Controlled Shutdown (< 1µA) s Antiringing Control Minimizes EMI s Tiny External ponents s Low Profile (1mm) SOT-23 Package U APPLICATIO S s Pagers s MP3 Players s Digital Cameras s LCD Bias Supplies s Handheld Instruments s Wireless Handsets s GPS Receivers DESCRIPTIO The LTC®3400/LTC3400B are synchronous, fixed frequency, step-up DC/DC converters delivering high efficiency in a 6-lead Thin SOT™ package. Capable of supplying 3.3V at 100m A from a single AA cell input, the devices contain an internal NMOS switch and PMOS synchronous rectifier. A switching frequency of 1.2MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally pensated, reducing external parts count. The LTC3400 Features automatic shifting to power saving Burst Mode operation at light loads, while the LTC3400B Features continuous switching at light loads. Antiringing control circuitry reduces EMI concerns by damping the inductor in discontinuous mode, and the devices feature low shutdown current of under 1µA. Both devices are available in the low profile (1mm) SOT-23 package. , LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO + SINGLE AA CELL L1 4.7µH C1 4.7µF VIN VOUT OFF ON LTC3400 SHDN FB C1, C2: TAIYO-YUDEN X5R EMK316BJ475ML L1: COILCRAFT DO160C-472 R1 1.02M 1% R2 604k 1% VOUT 3.3V 100m A C2 4.7µF 3400 F01 Figure 1. Single Cell to 3.3V Synchronous Boost Converter EFFIC...