LTC3528B

LTC3528/LTC3528B 1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN FEATURES ■ Delivers 3.3V at 200mA from a Single Alkaline/ NiMH Cell or 3.3V at 400mA from Two Cells ■ VIN Start-Up Voltage: 700mV ■ 1.6V to 5.25V VOUT Range ■ Up to 94% Efficiency ■ Output Disconnect ■ 1MHz Fixed Frequency Operation ■ VIN > VOUT Operation ■ Integrated Soft-Start ■ Current Mode Control with Internal Compensation ■ 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 APPLICATIONS ■ Medical Instruments ■ Flash-Based MP3 Players ■ Noise Canceling Headphones ■ Wireless Mice ■ Bluetooth Headsets 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 700mV start-up voltage and operation down to 500mV 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 compensated, 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 disconti...