LTC3528 Datasheet | Linear Technology

LTC3528/LTC3528B 1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN Features Delivers 3.3V at 200m A from a Single Alkaline/ Ni MH Cell or 3.3V at 400m A from Two Cells - V Start-Up Voltage: 700m V IN - 1.6V to 5.25V V OUT Range .. - Up to 94% Efficiency - Output Disconnect - 1MHz Fixed Frequency Operation - V >V IN OUT Operation - Integrated Soft-Start - Current Mode Control with Internal pensation - Burst Mode® Operation with 12μA Quiescent Current (LTC3528) - Low Noise PWM Operation (LTC3528B) - Internal Synchronous Rectifier - Logic Controlled Shutdown: <1μA - Anti-Ringing Control - Low Profile (3mm × 2mm × 0.75mm) DFN Package - DESCRIPTION The LTC®3528/LTC3528B are synchronous, fixed frequency step-up DC/DC converters with output disconnect. High efficiency synchronous rectification, in addition to a 700m V start-up voltage and operation down to 500m V once started, provides longer run-time for single or multiple cell battery-powered products. A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM is internally pensated, simplifying the design process. The LTC3528 enters Burst Mode operation at light loads, while the LTC3528B Features continuous switching at light loads. Anti-ringing circuitry reduces EMI by damping the inductor in discontinuous mode. Additional Features include a low shutdown current, open-drain power good output, shortcircuit protection and thermal overload protection. The LTC3528/LTC3528B are offered in an 8-lead 3mm × 2mm × 0.75mm DFN package. , LT , LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. APPLICATIONS - - - - - Medical Instruments Flash-Based MP3 Players Noise Canceling Headphones Wireless Mice Bluetooth Headsets TYPICAL APPLICATION 100 4.7μH 90 SW VIN 1.8V TO 3.2V 4.7μF VIN VOUT 499k FB 287k 3528...