1 Features
1• 1.0% Accuracy Over Line, Load, and Temperature
• Low Output Noise: 4.7 μVRMS (10 Hz–100 kHz)
• Low Dropout: 200 mV (max) at 1 A
• Wide Input Voltage Range: 1.4 V to 6.5 V
• Wide Output Voltage Range: 0.8 V to 5.2 V
• High Power-Supply Ripple Rejection (PSRR):
– 70 dB at DC
– 40 dB at 100 kHz
– 40 dB at 1 MHz
• Fast Transient Response
• Adjustable Start-Up In-Rush Control with
Selectable Soft-Start Charging Current
• Open-Drain Power-Good (PG) Output
• 2.5-mm × 2.5-mm, 10-Pin SON Package

2 Applications
• High-Speed Analog Circuits:
– VCO, ADC, DAC, LVDS
• Imaging: CMOS Sensors, Video ASICs
• Test and Measurement
• Instrumentation, Medical, and Audio
• Digital Loads: SerDes, FPGA, DSP

3 Description
The TPS7A91 is a low-noise (4.7 μVRMS), low-dropout
(LDO) voltage regulator capable of sourcing 1 A with
only 200 mV of maximum dropout.
The TPS7A91 output is adjustable with external
resistors from 0.8 V to 5.2 V. The TPS7A91 wide
input-voltage range supports operation as low as
1.4 V and up to 6.5 V.
With 1% output voltage accuracy (over line, load, and
temperature) and soft-start capabilities to reduce inrush
current, the TPS7A91 is ideal for powering
sensitive analog low-voltage devices [such as
voltage-controlled oscillators (VCOs), analog-to-digital
converters (ADCs), digital-to-analog converters
(DACs), high-end processors, and fieldprogrammable
gate arrays (FPGAs)].
The TPS7A91 is designed to power noise-sensitive
components such as those found in high-speed
communication, video, medical, or test and
measurement applications. The very low 4.7-μVRMS
output noise and wideband PSRR (40 dB at 1 MHz)
minimizes phase noise and clock jitter. These
features maximize performance of clocking devices,
ADCs, and DACs.