LTC3539-2 Datasheet | Linear Technology

LTC3539/LTC3539-2 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converters Features n Delivers 3.3V at 900m A From 2 Alkaline/Ni MH Cells n Delivers 5V at 900m A From a Lithium-Polymer Battery n VIN Start-Up Voltage: 700m V n 1.5V to 5.25V VOUT Range n Up to 94% Efficiency n VIN > VOUT Operation n ±1.5% Feedback Voltage Tolerance n 1MHz (LTC3539) or 2MHz (LTC3539-2) Fixed Frequency Operation n Output Disconnect n Selectable Burst Mode® or PWM Operation n 10µA Quiescent Current n Logic Controlled Shutdown: <1µA n Requires Only 6 External ponents n Low Profile (2mm × 3mm × 0.75mm) DFN Package APPLICATIONS n Medical Instruments n Portable Bar Code Scanners n Noise Canceling Headphones n Portable GPS Navigation n Handheld PCs DESCRIPTION The LTC®3539/LTC3539-2 are synchronous, 2A step-up DC/DC converters with output disconnect. Synchronous rectification enables high efficiency in the low profile 2mm × 3mm DFN package. Battery life is extended with a 700m V start-up voltage and operation down to 500m V once started. A switching frequency of 1MHz (LTC3539) or 2MHz (LTC3539-2) 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 LTC3539/LTC3539-2 feature a pin-enabled automatic Burst Mode operation at light load conditions. Anti-ring circuitry reduces EMI by damping the inductor in discontinuous mode. Additional Features include a low shutdown current of under 1µA and thermal overload protection. The LTC3539/LTC3539-2 are offered in a 2mm × 3mm × 0.75mm DFN package. L, LT, LTC, LTM and Burst Mode are registered trademarks and Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Wide VIN, High Power 3.3V Regulator Efficiency and Power Loss vs Load Current VIN 1.8V TO 3.6V 2.2µF PWM BURST 4.7µH LTC3539 MODE VOUT OFF ON SHDN GND FB...