TPS7A85A Datasheet, PDF (1/46 Pages) Texas Instruments – 4-A, High-Accuracy (0.75%), Low-Noise (4.4 uVRMS), LDO Regulator

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TPS7A85A
SBVS313 – JUNE 2017
TPS7A85A 4-A, High-Accuracy (0.75%), Low-Noise (4.4 μVRMS), LDO Regulator
1 Features
•1 Low Dropout: 150 mV (Typical) at 4 A
• 0.75% (Maximum) Accuracy Over Line, Load, and
Temperature With BIAS
• Output Voltage Noise:
– 4.4 μV_RMS at 0.8-V Output
– 7.7 μV_RMS at 5.1-V Output
• Input Voltage Range:
– Without BIAS: 1.4 V to 6.5 V
– With BIAS: 1.1 V to 6.5 V
• ANY-OUT™ Operation:
– Output Voltage Range: 0.8 V to 3.95 V
• Adjustable Operation:
– Output Voltage Range: 0.8 V to 5.1 V
• Power-Supply Ripple Rejection:
– 40 dB at 500 kHz
• Excellent Load Transient Response
• Adjustable Soft-Start In-Rush Control
• Open-Drain Power-Good (PG) Output
• Stable with a 47-μF or Larger Ceramic Output
Capacitor
• θ_JC = 3.4°C/W
• 3.5-mm × 3.5-mm, 20-Pin VQFN
2 Applications
• Digital Loads: SerDes, FPGAs, and DSPs
• Instrumentation, Medical, and Audio
• High-Speed Analog Circuits:
– VCO, ADC, DAC, and LVDS
• Imaging: CMOS Sensors and Video ASICs
• Test and Measurement
3 Description
The TPS7A85A is a low-noise (4.4 μV_RMS), low
dropout linear regulator (LDO) capable of sourcing 4
A with only 240 mV of maximum dropout. The device
output voltage is pin-programmable from 0.8 V to
3.95 V and adjustable from 0.8 V to 5.1 V using an
external resistor divider.
The combination of low-noise (4.4 μV_RMS), high-
PSRR, and high output current capability makes the
TPS7A85A ideal to power noise-sensitive
components such as those found in high-speed
communications, video, medical, or test and
measurement applications. The high performance of
the TPS7A85A limits power-supply-generated phase
noise and clock jitter, making this device ideal for
powering high-performance serializer and deserializer
(SerDes), analog-to-digital converters (ADCs), digital-
to-analog converters (DACs), and RF components.
Specifically, RF amplifiers benefit from the high-
performance and 5.1-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 voltage, low-output (LILO)
voltage operation, the exceptional accuracy (0.75%
over load and temperature), remote sensing,
excellent transient performance, and soft-start
capabilities of the TPS7A85A ensure optimal system
performance.
The versatility of the TPS7A8500A makes the device
a component of choice for many demanding
applications.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS7A85A
VQFN (20)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Powering RF Components
TPS7A85A
Input Supply
IN
OUT
PG
VCC
EN
IQ Modulators
TRF372017
TRF3722
VCC
IQ Demodulators
TRF371125
TRF371135
Copyright © 2017, Texas Instruments Incorporated
Powering Digital Loads
Bias
Supply
CBIAS
1.4 VIN
CIN
CNR/SS
IN
BIAS
EN
PG
NR/SS
1.6 V
800 mV
400 mV
200 mV
100 mV
50 mV
TPS7A85A
GND
OUT
SNS
FB
RPG
CFF
ANYOUT
Used to set
voltage
COUT
0.9 VOUT
To Digital
Load
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.