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LTC3527 - Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters

The LTC3527/LTC3527-1 are dual high efficiency, step-up DC/DC converters in a space saving 16-lead 3mm × 3mm QFN package. Battery life is maximized with a 700mV startup voltage and operation down to 500mV once started. The SHDN and PGOOD pins enable the converters to be sequenced or started together.

The LTC3527/LTC3527-1 limit inrush current during startup. Selectable 1.2MHz or 2.2MHz operation provides a choice between the highest efficiency or smallest solution footprint. The current mode PWM design is internally compensated reducing external parts count. Burst Mode operation or fixed frequency operation is selectable via the MODE pin. Anti-ring circuitry reduces EMI in discontinuous mode. This device also features thermal shutdown.

True output disconnect allows the output to be completely open in shutdown. The LTC3527-1 actively discharges VOUT1 or VOUT2 when its respective SHDN goes low. Quiescent current in shutdown is less than 2μA.

Features Dual Synchronous Step-Up DC/DC Converters Delivers 3.3V at 200mA/100mA from one Alkaline/ NiMH Cell, or 3.3V at 400mA/200mA from Two Cells VIN Start-Up Voltage: 700mV 0.5V to 5V VIN Range After Start-Up 1.6V to 5.25V VOUT Range Output Disconnect in Shutdown VIN > VOUT Operation 1.2MHz or 2.2MHz Operation Up to 94% Efficiency 12μA Quiescent Current in Burst Mode® Operation Inrush Current Limiting and Soft-Start Internal Synchronous Rectifiers Logic-Controlled Shutdown (< 2μA) Quick VOUT Discharge (LTC3527-1) 16-Lead, 0.75mm × 3mm × 3mm QFN Package Typical Application

Applications MP3/Personal Media Players Noise Canceling/Bluetooth Headsets Wireless Mice Portable Medical Instruments Packaging

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