LTC3535 Datasheet | Linear Technology

Features Dual Channel 550m A 1MHz Synchronous Step-Up DC/DC Converter DESCRIPTION n Two Independent Step-Up Converters n Each Channel Delivers 3.3V at 100m A from a Single Alkaline/Ni MH Cell or 3.3V at 200m A from Two Cells n VIN Start-Up Voltage: 680m V n 1.5V to 5.25V VOUT Range n Up to 94% Efficiency n Output Disconnect n 1MHz Fixed Frequency Operation n VIN > VOUT Operation n Integrated Soft-Start n Current Mode Control with Internal pensation n Burst Mode® Operation with 9µA IQ Each Channel n Internal Synchronous Rectifier n Logic Controlled Shutdown (IQ < 1µA) n Anti-Ring Control n Low Profile (3mm × 3mm × 0.75mm) 12-Lead DFN Package APPLICATIONS n Medical Instruments n Noise Canceling Headphones n Energy Harvesting n Bluetooth Headsets The LTC®3535 is a dual channel, synchronous, fixed frequency step-up DC/DC converter with output disconnect. Extended battery life in single AA/AAA powered products is realized with a 680m V start-up voltage and operation down to 500m V once started. A switching frequency of 1MHz 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 LTC3535 Features Burst Mode operation at light load conditions allowing it to maintain high efficiency over a wide range of load. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional Features include a low shutdown current of under 1µA and thermal shutdown. The LTC3535 is housed in a 3mm × 3mm × 0.75mm DFN package. L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 4.7µH VIN 0.8V TO 1.5V OFF ON 2.2µF OFF ON SW1 VIN1 VOUT1 SHDN1 VOUT2 VIN2 FB1 SHDN2 FB2 GND SW2 GND 4.7µH 10µF 10µF VOUT2 3.3V 50m...