TPSM82913 Low-Noise Low-Ripple Buck Power Module

Texas Instruments' TPSM82913 is a high-efficiency, low-noise, and low-ripple current mode synchronous buck power module that is ideal for noise-sensitive applications that would normally use an LDO for post regulation such as high-speed ADCs, clock and jitter cleaners, serializers, de-serializers, and radars. The device operates at a fixed switching frequency of 2.2 MHz or 1 MHz and can be synchronized to an external clock.

To further reduce the output voltage ripple, the device integrates loop compensation to operate with an optional second-stage ferrite bead L-C filter. This allows an output voltage ripple of less than 10 µV_RMS. The low-frequency noise levels, similar to a low-noise LDO, are achieved by filtering the internal voltage reference with an integrated capacitor on the NR/SS pin. An external capacitor can be added to the module for additional filtering. The optional spread-spectrum modulation scheme spreads the DC/DC switching frequency over a wider span, which lowers the mixing spurs.