TPS7A90 Datasheet, PDF (1/33 Pages) Texas Instruments – 500-mA, High-Accuracy, Low-Noise LDO Voltage Regulator

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TPS7A90
500-mA, High-Accuracy, Low-Noise LDO Voltage Regulator
TPS7A90
SBVS324 – JUNE 2017
1 Features
•1 1.0% Accuracy Over Line, Load, and Temperature
• Low Output Noise: 4.7 µV_RMS (10 Hz–100 kHz)
• Low Dropout: 100 mV (max) at 0.5 A
• Wide Input Voltage Range: 1.4 V to 6.5 V
• Wide Output Voltage Range: 0.8 V to 5.7 V
• High Power-Supply Rejection Ratio (PSRR):
– 60 dB at DC
– 50 dB at 100 kHz
– 30 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
• θ_JC = 3.2ºC/W
• 2.5-mm × 2.5-mm, 10-Pin WSON 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 TPS7A90 device is a low-noise (4.7 µV_RMS), low-
dropout (LDO) voltage regulator capable of sourcing
500 mA with only 100 mV of maximum dropout to 5 V
and 200 mV to 5.7 V.
The TPS7A90 output is adjustable with external
resistors from 0.8 V to 5.7 V. The TPS7A90 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 TPS7A90 is ideal for powering
sensitive analog low-voltage devices [such as
voltage-controlled oscillators (VCOs), analog-to-digital
converters (ADCs), and digital-to-analog converters
(DACs)].
The TPS7A90 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 (30 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)
TPS7A90
WSON (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
IN
TPS7A90
OUT
EN
FB
SS_CTRL
NR/SS
PG
GND
R1 5.9 k:
1.2 V
COUT
10 F
CFF 10 nF
R2
VOU T
11.8 k:
RPG
20 k:
PG
Copyright © 2017, Texas Instruments Incorporated
Typical Application Diagram
VIN
IN
PG
CIN
OUT
COUT
TPS7A90
ENABLE
Clock
VDD_VCO
LMK03328
LMX2581
EN
EN
GND
VDD
SCLK
ADC
ADC3xxx
ADC3xJxx
ADC3xJBxx
ADS4xxBxx
ADS5xJxx
ADS12Jxxxx
Copyright © 2017, 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.