1 Features
• Input voltage range:
– Without BIAS: 1.1 V to 6.0 V
– With BIAS: 0.7 V to 6.0 V
• Output voltage noise: 2.45 μVRMS
• 1% (max) accuracy over line, load, and
temperature
• Low dropout: 75 mV at 5 A
• Power-supply rejection ratio (5 A):
– 100 dB at 1 kHz
– 78 dB at 10 kHz
– 60 dB at 100 kHz
– 36 dB at 1 MHz
• Superior load transient response:
– ±2 mV with a 100-mA to 5-A load step
• Adjustable output voltage range: 0.5 V to 5.2 V
• Adjustable soft-start inrush control
• BIAS rail:
– Internal charge pump or 3-V to 11-V external
rail
– Internal charge pump can be disabled
• Open-drain, power-good (PG) output
• Package: 3-mm × 3-mm, 16-pin WQFN
– EVM RθJA: 21.9°C/W

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 TPS7A57 is a low-noise (2.45 μVRMS), ultra-lowdropout
linear regulator (LDO) capable of sourcing
5 A with only 75 mV of dropout, independently
of the output voltage. The device output voltage
is adjustable from 0.5 V to 5.2 V using a single
external resistor. The combination of low noise,
high PSRR (36 dB at 1 MHz), and high outputcurrent
capability makes the TPS7A57 designed
for powering noise-sensitive components (such as
RF amplifiers, radar sensors, SERDES and analog
chipsets) found in radar power, communication, and
imaging applications.
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 also benefit from the exceptional accuracy
(1% over load, line, and temperature), remote
sensing, excellent transient performance, and
soft-start capabilities to provide optimal system
performance. The versatility, performance, and small
footprint solution make this LDO an excellent choice
for high-current analog loads such as analog-todigital
converters (ADCs), digital-to-analog converters
(DACs), and imaging sensors as well as digital loads
such as serializer/deserializers (SerDes), FPGAs, and
DSPs.