TPS65257

TPS65257 www.ti.com SLVSB32A – SEPTEMBER 2011 – REVISED DECEMBER 2012 4.5-V TO 16-V INPUT, HIGH CURRENT, SYNCHRONOUS STEP DOWN THREE DC-DC CONVERTER WITH INTEGRATED FET, USB SWITCH AND PUSH BUTTON CONTROL Check for Samples: TPS65257 FEATURES 1 Wide Input Supply Voltage Range: 4.5 V - 16 V 0.8-V, 1% Accuracy Reference Continuous Loading: 3 A (Buck1), 2 A (Buck2 and 3) Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck2 and 3) Synchronous Operation, 300-kHz – 2.2-MHz Switching Frequency Set By External Resistor External Enable Pins With Built-In Current Source for Easy Sequencing External Soft Start Pins Adjustable Cycle-by-Cycle Current Limit Set by External Resistor Current-Mode Control With Simple Compensation Circuit Automatic Low Pulse Skipping (PSM) Power Mode, Allowing for an Output Ripple Better than 2% Support Pre-Biased Outputs Power Good Supervisor and Reset Generator 1-A USB Power Switch With Overcurrent and Thermal Protection Push Button (10-kV ESD Rated Pin for PB_IN) Control for Intelligent System PowerOn/Power-Off Operation Small, Thermally Efficient 40-Pin 6-mm x 6-mm RHA (QFN) package -40°C to 125°C Junction Temperature Range DESCRIPTION/ORDERING INFORMATION TPS65257 is a power management IC with three step-down buck converters. Both high-side and low-side MOSFETs are integrated to provide fully synchronous conversion with higher efficiency. The converters are designed to simplify its application while giving the designer the op...