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Product details

Parameters

Output options Adjustable Output, Programmable Output Iout (Max) (A) 4 Vin (Max) (V) 6.5 Vin (Min) (V) 1.1 Vout (Max) (V) 5 Vout (Min) (V) 0.8 Noise (uVrms) 4.4 Iq (Typ) (mA) 2.8 Thermal resistance θJA (°C/W) 35 Load capacitance (Min) (µF) 47 Rating Catalog Regulated outputs (#) 1 Features Enable, Output Discharge, Power Good, Soft Start Accuracy (%) 1 PSRR @ 100 KHz (dB) 25 Dropout voltage (Vdo) (Typ) (mV) 150 Operating temperature range (C) -40 to 125 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

VQFN (RGR) 20 12 mm² 3.5 x 3.5 open-in-new Find other Linear regulators (LDO)

Features

  • Low Dropout: 150 mV (typ) at 4 A
  • 1% (max) Accuracy Over Line, Load, and Temperature
  • Output Voltage Noise:
    • 4.4 µVRMS at 0.8-V Output
    • 8.4 µVRMS 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
open-in-new Find other Linear regulators (LDO)

Description

The TPS7A85 is a low-noise (4.4 µVRMS), 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 µVRMS), 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.

The versatility of the TPS7A85 makes the device a component of choice for many demanding applications.

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Exact equivalent in functionality and parametrics to the compared device:
TPS7A85A ACTIVE 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good 4-A LDO regulator with excellent accuracy (0.75%). This is an improved p2p upgrade to the TPS7A85.

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet TPS7A85 High-Current (4 A), High-Accuracy (1%), Low-Noise (4.4 µVRMS), LDO Voltage Regulator datasheet (Rev. A) Feb. 05, 2016
Technical articles LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical articles LDO Basics: Preventing reverse current Jul. 25, 2018
Technical articles LDO basics: introduction to quiescent current Jun. 20, 2018
Selection guides Low Dropout Regulators Quick Reference Guide (Rev. P) Mar. 21, 2018
Technical articles LDO basics: noise – part 1 Jun. 14, 2017
Selection guides TI Components for Aerospace and Defense Guide (Rev. E) Mar. 22, 2017
User guides TPS7A85EVM-754 Evaluation Module User's Guide Feb. 29, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
Description

The DAC38RF80EVM is the circuit board for evaluating DAC38RF80/84/90 digital-to-analog converters (DACs). The EVM can be used to evaluate the performance of the DAC up to 9-GSPS sampling rate. It is designed to work with the FPGA-based pattern generator card TSW14J56EVM (Rev B and up). The available (...)

Features
  • Allows evaluation of DAC38RF80/84/90 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with 2:1 impedance transformer for (...)
EVALUATION BOARDS Download
document-generic User guide
Description
The DAC38RF82EVM is the circuit board for evaluating DAC38RF82/83/85/93 digital to analog converters (DACs). The EVM can be used to evaluate the performance of the DAC up to 9GSPS sampling rate and it is designed to work with the TSW14J56 EVM. The available FMC connector also makes it possible to (...)
Features
  • Allows evaluation of DAC38RF82/83/85/93 up to 9GSPS sampling rate
  • Supports up to 12.5Gbps serdes signaling rate across FMC
  • Integrated low phase noise On–chip PLL with 2 VCOs to simplify system clock generation. Also supports external clock mode.
  • AC coupled, differential output with on-board 2:1 (...)
EVALUATION BOARDS Download
document-generic User guide
Description
The DAC38RF87 evaluation module (EVM) is the circuit board for evaluating the DAC38RF87 digital-to-analog converter (DAC). The EVM can be used to evaluate the performance of the DAC up to 9-GSPS sampling rate and is designed to work with the TSW14J56EVM (Rev B and up). The available FMC connector (...)
Features
  • Allows evaluation of DAC38RF87/97 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with integrated impedance transformer (DAC38RF87) for (...)
EVALUATION BOARDS Download
document-generic User guide
Description

The DAC38RF89 evaluation module (EVM) is the circuit board for evaluating DAC38RF89 digital-to-analog converters (DACs). The DAC38RFEVM can be used to evaluate the performance of the DAC up to 9-GSPS sampling rate and is designed to work with the TSW14J56EVM (Rev B and up). The available FMC (...)

Features
  • Allows evaluation of DAC38RF89 up to 9-GSPS sampling rate
  • Supports up to 12.5-Gbps SerDes signaling rate across FMC
  • Two on-chip PLLs with superior phase noise to simplify system clock generation; also supports external clock mode
  • AC-coupled output with integrated impedance transformer (DAC38RF89) for (...)
EVALUATION BOARDS Download
document-generic User guide
29
Description
The TPS7A85EVM-754 evaluation module is designed for a typical configuration to evaluate the operation and performance of the TPS7A85, High-Current 4-A low dropout voltage regulator.  The EVM circuit board is configured to be a reference design for engineering applications requiring current to (...)
Features
  • Low Dropout: 180 mV (max) at 4 A
  • 1% (max) Accuracy Over Line, Load, and Temperature
  • ANY-OUT Output Voltage Range: 0.8 V to 3.95 V
  • Adjustable Output Voltage Range: 0.8 V to 5.0 V
  • High Power-Supply Ripple Rejection: 40 dB at 500 kHz
EVALUATION BOARDS Download
document-generic User guide
2499
Description

The TSW40RF80 evaluation module (EVM) is a two-transmit two-receive (2T2R) RF-sampling transceiver reference design. The module contains the DAC38RF80 dual-channel RF-sampling digital-to-analog converter (DAC) and the ADC32RF45 dual-channel RF-sampling analog-to-digital converter (ADC).

The DAC38RF80 (...)

Features
  • RF-sampling transceiver utilizing the JESD204B interface
  • DAC38RF80 dual RF DAC with single-ended output
  • ADC32RF45 dual RF ADC with bypass option
  • LDO-less power-management solution
  • Onboard clocking solution; four different ADC clocking options, including TX PLL clock output
  • Interfaces with TSW14J56 or (...)
EVALUATION BOARDS Download
document-generic User guide
2499
Description

The TSW40RF82 evaluation module (EVM) is a two-transmit two-receive (2T2R) RF-sampling transceiver reference design. The module contains the DAC38RF82 dual-channel RF-sampling digital-to-analog converter (DAC) and the ADC32RF45 dual-channel RF-sampling analog-to-digital converter (ADC).

The DAC38RF82 (...)

Features
  • RF-sampling transceiver utilizing the JESD204B interface
  • DAC38RF82 dual RF DAC with differential output
  • ADC32RF45 dual RF ADC with bypass option
  • LDO-less power-management solution
  • Onboard clocking solution; four different ADC clocking options, including TX PLL clock output
  • Interfaces with TSW14J56 or FPGA (...)

Design tools & simulation

SIMULATION MODELS Download
SBVM572.ZIP (3 KB) - PSpice Model
SIMULATION MODELS Download
SBVM573.ZIP (77 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
RF-Sampling S-Band Radar Transmitter Reference Design
TIDA-01240 — Synthesis of waveforms appropriate for an S-band multifunction phased array radar (MPAR) is demonstrated with an RF sampling architecture utilizing the DAC38RF80, a 9GSPS 16-bit digital-to-analog converter (DAC). The RF sampling transmit architecture simplifies the signal chain, bringing the data (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Bandwidth Zero-IF Reference Design for Microwave Backhaul
TIDA-01435 — The TSW40RF82EVM reference design provides a platform to interface the DAC38RF82 with a high-performance modulator - the TRF370417EVM. The TRF370417EVM can modulate wideband signals at up to 6 GHz as would be typical for a microwave backhaul application. The TRF370417 device may be substituted for a (...)
document-generic Schematic document-generic User guide
Design files
REFERENCE DESIGNS Download
Low noise power-supply reference design maximizing performance in 12.8 GSPS data acquisition systems
TIDA-01027 — This reference design demonstrates an efficient, low noise 5-rail power-supply design for very high-speed DAQ systems capable of > 12.8 GSPS. The power supply DC/DC converters are frequency synchronized and phase-shifted in order to minimize input current ripple and control frequency content (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-Current Low-Noise Parallel LDO Reference Design
TIDA-01232 This parallel low-dropout (LDO) reference design showcases the TPS7A85 low-noise LDO linear regulator in a parallel configuration, which is capable of sourcing 3.5 A per LDO or 7 A per board. Additional design flexibility includes the ability to stack this design to meet the current (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Continuous Wave Phase-aligned Multitone Generator: DC-to-6-GHz RF-Sampling DAC Reference Design
TIDA-01084 The TIDA-01084 reference design demonstrates the use of RF sampling DAC to generate continuous phase-aligned multitone waveforms. With four 48-bit independent NCOs, the 14-bit, 9GSPS DAC38RF83 can generate four CW tones placed anywhere within the first Nyquist zone or up to 6 GHz in the second.

This (...)

document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RGR) 20 View options

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