TPS62912 2 A Low-Noise and Low-Ripple Buck Converter

Texas Instruments' TPS62912 is a high-efficiency, low-noise, and low-ripple current-mode synchronous buck converter. The device is ideal for noise-sensitive applications that normally use an LDO for post-regulation such as high-speed ADCs, clock and jitter cleaners, serializers, de-serializers, and radar applications. The devices operate at a fixed switching frequency of 2.2 MHz or 1 MHz and can be synchronized to an external clock.

The device integrates loop compensation to operate with an optional second-stage ferrite bead L-C filter to further reduce the output voltage ripple This allows an output voltage ripple below 10 µV_RMS. Low-frequency noise levels similar to a low-noise LDO are achieved by filtering the internal voltage reference with a capacitor connected to the NR/SS pin. The optional spread spectrum modulation scheme spreads the DC/DC switching frequency over a wider span, which lowers the mixing spurs.