TPS53511

TPS53511 SLUSBG4B – MARCH 2013 – REVISED AUGUST 2021 4.5-V to 18-V Input, 1.5-A Step-Down Regulator with Integrated Switcher 1 Features Continuous 1.5-A output current 4.5-V to 18-V supply voltage range 2-V to 18-V conversion voltage range DCAP2™ mode control enables fast transient response Low output ripple and support all MLCC output capacitor Skip mode for light load control Highly efficient integrated FETs optimized for lower duty cycle applications High efficiency, less than 10-µA supply current at shutdown Adjustable soft-start time Support pre-biased soft start 700-kHz switching frequency Cycle-by-cycle overcurrent limit Open-drain power-good indication Internal bootstrap switch Small 3-mm × 3-mm, 16-pin QFN (RGT) package 2 Applications Points-of-load for server Distributed non-isolated DC-DC converters for computing power system 3 Description The TPS53511 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The device is suitable for points-of-load (POL) in computing power systems, and provides a cost-effective, low component count, low standby current solution. The main control loop for the TPS53511 uses the DCAP2™ mode control to provide a fast transient response with no external components. The adaptive on-time control supports seamless operation between PWM mode during heavy load conditions and reduced frequency operation during light-load conditions for high efficiency. The TPS53511 includes a proprietary circuit t...