TPS7A91 Datasheet, PDF (1/31 Pages) Texas Instruments – 1-A, High-Accuracy, Low-Noise LDO Voltage Regulator

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TPS7A91
SBVS282 – DECEMBER 2016
TPS7A91
1-A, High-Accuracy, Low-Noise LDO Voltage Regulator
1 Features
•1 1.0% Accuracy Over Line, Load, and Temperature
• Low Output Noise: 4.7 µV_RMS (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 µV_RMS), 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 in-
rush 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 field-
programmable 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-µV_RMS
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS7A91
SON (10)
2.50 mm × 2.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
2.0 V
Typical Application Circuit
CIN
10 PF
CNR/SS
0.1 PF
TPS7A91
IN
OUT
EN
FB
SS_CTRL
NR/SS
PG
GND
R1 5.9 k:
1.2 V
COUT
10 F
CFF 10 nF
R2
VOUT
11.8 k:
RPG
20 k:
PG
Copyright © 2016, Texas Instruments Incorporated
Typical Application Diagram
VIN
IN
PG
CIN
OUT
COUT
TPS7A91
ENABLE
Clock
VDD_VCO
LMK03328
LMX2581
EN
EN
GND
VDD
SCLK
ADC
ADC3xxx
ADC3xJxx
ADC3xJBxx
ADS4xxBxx
ADS5xJxx
ADS12Jxxxx
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.