TPS7A85 Datasheet, PDF (1/48 Pages) Texas Instruments – LDO Voltage Regulator

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TPS7A85
SBVS267A – JANUARY 2016 – REVISED FEBRUARY 2016
TPS7A85
High-Current (4 A), High-Accuracy (1%), Low-Noise (4.4 µV_RMS), LDO Voltage Regulator
1 Features
•1 Low Dropout: 150 mV (typ) at 4 A
• 1% (max) Accuracy Over Line, Load, and
Temperature
• Output Voltage Noise:
– 4.4 µV_RMS at 0.8-V Output
– 8.4 µV_RMS at 5.0-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 5.0 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
• Operating Temperature Range:
–40ºC to +125°C
• 3.5-mm × 3.5-mm, 20-Pin VQFN
3 Description
The TPS7A85 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 5.0 V using an external
resistor divider.
The combination of low-noise (4.4 µV_RMS), high-
PSRR, and high output current capability makes the
TPS7A85 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 TPS7A85
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
5.0-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 TPS7A85 ensure optimal system
performance.
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
The versatility of the TPS7A85 makes the device a
component of choice for many demanding
applications.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (nom)
TPS7A85
VQFN (20)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Powering RF Components
Bias Supply
Powering Digital Loads
Bias Supply
Input Supply
EN Signal
BIAS
IN
TPS7A85 OUT
EN
PG
ADC
DAC
ADS54J40
ADS54J66
ACD31JB68
DAC38J82
DAC39J84
DAC5670
Input Supply
EN Signal
BIAS
IN
TPS7A85 OUT
EN
PG
GPIO
VDD
DSP,
ASIC,
FPGA
C6000
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.