1 Features

• Accuracy over line, load, and temperature with

BIAS: 0.5

• Output voltage noise: 4.6μVRMS

• Low dropout: 110mV (max) at 3A with BIAS

• Power-supply rejection ratio:

– 48dB at 500kHz

• Input voltage range:

– Without BIAS: 1.4V to 6.5V

– With BIAS: 1.1V to 6.5V

• Adjustable output voltage range: 0.5V to 5.15V

• Adjustable soft-start inrush control

• Open-drain, power-good (PG) output

• 2.5mm × 2.2mm, 12-pin VQFN package

2 Applications

• Macro remote radio units (RRU)

• Outdoor backhaul units

• Active antenna system mMIMO (AAS)

• Ultrasound scanners

• Lab and field instrumentation

• Sensor, imaging, and radar

3 Description

The TPS7A53B is a low-noise (4.6μVRMS), ultra-low

dropout linear regulator (LDO) capable of sourcing 3A

with only 110mV of maximum dropout. The device

output voltage is adjustable from 0.5V to 5.15V using

an external resistor divider.

The combination of low noise (4.6μVRMS), high

PSRR, and high output current capability makes

the TPS7A53B a great solution for powering

noise-sensitive components. Applications include

high-speed communications, video, medical, or

test and measurement. The high PSRR and low

noise performance of this device limits power-supplygenerated

phase noise and clock jitter, making

this device a good choice for powering highperformance

serializers and deserializers (SerDes),

analog-to-digital converters (ADCs), and digital-toanalog

converters (DACs). Specifically, RF amplifiers

benefit from the high performance and 5.15V output

capability of the device.

For digital loads [such as application-specific

integrated circuits (ASICs), field-programmable gate

arrays (FPGAs), and digital signal processors

(DSPs)] requiring low-input, low-output (LILO) voltage

operation, the exceptional accuracy (0.5 over

load and temperature), remote sensing, excellent

transient performance, and soft-start capabilities of

the TPS7A53B provides optimal system performance.

As an adjustable voltage regulator, the design of the

TPS7A53B offers versatility. This versatility makes

the device a component of choice for analog loads

such as voltage-controlled oscillators (VCOs), ADCs,

DACs, and imaging sensors and for digital loads such

as SerDes, FPGAs, and DSPs.