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.