1 Features

• Accuracy over line, load, and temperature with

BIAS: 0.5

• Output voltage noise: 4.4 μVRMS

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

• Power-supply rejection ratio:

– 40 dB at 500 kHz

• Input voltage range:

– Without BIAS: 1.4 V to 6.5 V

– With BIAS: 1.1 V to 6.5 V

• Adjustable output voltage range: 0.5 V to 5.15 V

• Adjustable soft-start inrush control

• Open-drain, power-good (PG) output

• 2.5-mm × 2.2-mm, 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 (4.4 μVRMS), ultra-low

dropout linear regulator (LDO) capable of sourcing

3 A with only 110 mV of maximum dropout. The

device output voltage is adjustable from 0.5 V to

5.15 V using an external resistor divider.

The combination of low noise (4.4 μVRMS),

high PSRR, and high output current capability

makes the TPS7A53B designed for powering noisesensitive

components such as those found in highspeed

communications, video, medical, or test-andmeasurement

applications. The high performance

of this device limits power-supply-generated phase

noise and clock jitter, making this device a good

choice for powering high-performance serializers and

deserializers (SerDes), analog-to-digital converters

(ADCs), and digital-to-analog converters (DACs).

Specifically, RF amplifiers benefit from the high

performance and 5.15-V 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, there is versatility

in the design of the TPS7A53B that 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.