New family of high-efficiency synchronous step-down DC-DC converters

The Texas Instruments TPS62851x is a family of pin-to-pin 0.5A, 1A, 2A (continuous), and 3A (peak) high efficiency, easy-to-use, synchronous step-down DC-DC converters.

They are based on a peak current mode control topology. Low resistive switches allow up to 2A continuous output current and 3A peak current. The switching frequency is internally fixed at 2.25MHz and can also be synchronized to an external clock from 1.8MHz to 4MHz. In PWM/PFM mode, the family automatically enters power save mode at light loads to retain high efficiency over the whole load range. It provides a 1% output voltage accuracy in PWM mode, which assists in the design of a power supply with high output voltage accuracy. The SS/TR pin permits setting the start-up time or tracking the output voltage to an external source, which enables external sequencing of varying supply rails and limits the inrush current during start-up.

The family is offered in an 8-pin 1.6mm × 2.1mm SOT583 package, providing a high power density solution.