17-VIN, 2-A low-noise and low-ripple buck converter with integrated ferrite bead filter compensation

The TPS6291x devices are a family of

high-efficiency, low noise and low ripple current mode synchronous buck converters.

The devices are ideal for noise sensitive applications that would normally use an

LDO for post regulation such as high-speed ADCs, clock and jitter cleaner,

serializer, de-serializer, 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.

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 below 10 µVRMS.

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.