The TPS51220 is a dual, peak-current mode, synchronous step-down controller with three low-dropout (LDO) regulators. It is optimized for 5-V /3.3-V notebook system power supplies. A 99% duty cycle operation enables designers to complete Li-ion battery applications from 2-cells to 4-cells cost effectively. The TPS51220 supports high-efficiency, fast transient response and 99% duty cycle operation. DCR current sensing provides lossless current sensing and free MOSFET selection; resistor sensing supports accurate current-sensing operation. It supports supply input voltages ranging from 4.5 V to 30 V and output voltages from 1 V to 12 V. High-current, 5 V at 100 mA, 3.3 V at 10 mA, onboard linear regulators have glitch-free switchover function to SMPS, and the 2-V reference has a 100-μA capability.

A peak current-sensing current mode and fixed-frequency control scheme support the full range of current mode operation including simplified loop compensation, ceramic output capacitors, as well as a seamless transition to reduced frequency operation at light-load condition.

This evaluation module demonstrates the performance of the high-current/ high-efficiency TPS51220 buck converter