TPS65251-3

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community TPS65251-1, TPS65251-2, TPS65251-3 SLVSC70A – JANUARY 2015 – REVISED JANUARY 2015 TPS65251-x 4.5-V to 18-V Input, High Current, Synchronous Step Down Three Buck Switchers With Integrated FET 1 Features 1 Wide Input Supply Voltage Range (4.5 to 18 V) Output Range 0.8 V to VIN – 1 V Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3) Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3) Adjustable Switching Frequency 300 kHz to 2.2 MHz Set by External Resistor Dedicated Enable for Each Buck External Synchronization Pin for Oscillator Adjustable Current Limit Set by External Resistor Soft-Start Pins Current-Mode Control With Simple Compensation Circuit Power Good Automatic PFM/PWM Operation VQFN Package, 40-Pin 6-mm × 6-mm RHA 2 Applications Set Top Boxes Blu-ray™ DVD DVR DTV Car Audio/Video Security Camera 3 Description The TPS65251-x features three synchronous wideinput range, high-efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application. The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features an enable pin that allows a delayed start-up for ...