The TPS54122 device combines the efficiency of a step-down switching (dc-dc) converter
with a high power-supply rejection (PSR), low-noise, low-dropout regulator (LDO) to provide an
ultralow-noise power supply that delivers QuietSupply rails to noise-sensitive applications.
The TPS54122 device is ideally suited for systems with 5-V power busses and can support
3-A continuous output current on both 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 5.0 V using external resistors.
The TPS54122 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 device includes features
such as soft-start, switching frequency synchronization, and a power-good signal.
The TPS54122 device can also be configured as a dual-supply rail device, supplying a
total of 3 A.
The TPS54122 device is available in a space-saving,
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3.50 mm × 5.50 mm VQFN package, and is specified to operate over a –40°C to +125°C ambient