The TPS54122 device combines an efficient step-down switching (DC-DC) converter with a
high power-supply rejection (PSR), low-noise, low-dropout regulator (LDO) to provide an
ultra-low-noise power supply that delivers a QuietSupply rail to noise-sensitive
TPS54122 is ideally suited for systems with 5-V power busses and can support 3-A
continuous output current through the DC-DC or LDO output. The LDO output voltage can be set from
0.8 V to 3.6 V, and the DC-DC can be adjusted from 0.83 V to 5 V using external resistors. The
device can be used in a wide range of low-noise applications because the dc-dc converter and LDO
are completely configurable. In addition, the TPS54122 includes features such as soft start,
switching frequency synchronization, and a power-good signal.
By feeding the output of the DC-DC converter to the input of the LDO, the TPS54122 can
supply efficient, low-noise power at up to 3 A.
The TPS54122 is available in a space-saving,
5.50 mm × 3.50 mm VQFN package, and is specified to operate over a –40°C to +125°C ambient
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