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Linear & low-dropout (LDO) regulators

TPS7A91

ACTIVE

1-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy

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Data sheet

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TLV759P ACTIVE 1-A, low-IQ, high-accuracy, adjustable ultra-low-dropout voltage regulator with enable 1A, adjustable output LDO with lower IQ for cost-sensitive applications.
TPS746 ACTIVE 1-A, low-IQ, high-accuracy, adjustable ultra-low-dropout voltage regulator with power good & enable 1A, adjustable output LDO with lower IQ and power good for cost-sensitive applications.

TPS7A91

ACTIVE
Data sheet Order now

Product details

Output options Adjustable Output Iout (max) (A) 1 Vin (max) (V) 6.5 Vin (min) (V) 1.4 Vout (max) (V) 5.2 Vout (min) (V) 0.8 Rating Catalog Noise (µVrms) 4.7 PSRR at 100 KHz (dB) 48 Iq (typ) (mA) 2.1 Thermal resistance θJA (°C/W) 57 Load capacitance (min) (µF) 22 Regulated outputs (#) 1 Features Enable, Foldback Overcurrent protection, Output discharge, Power good, Soft start Accuracy (%) 1 Dropout voltage (Vdo) (typ) (mV) 130 Operating temperature range (°C) -40 to 125
Output options Adjustable Output Iout (max) (A) 1 Vin (max) (V) 6.5 Vin (min) (V) 1.4 Vout (max) (V) 5.2 Vout (min) (V) 0.8 Rating Catalog Noise (µVrms) 4.7 PSRR at 100 KHz (dB) 48 Iq (typ) (mA) 2.1 Thermal resistance θJA (°C/W) 57 Load capacitance (min) (µF) 22 Regulated outputs (#) 1 Features Enable, Foldback Overcurrent protection, Output discharge, Power good, Soft start Accuracy (%) 1 Dropout voltage (Vdo) (typ) (mV) 130 Operating temperature range (°C) -40 to 125
WSON (DSK) 10 6.25 mm² 2.5 x 2.5
  • 1.0% Accuracy Over Line, Load, and Temperature
  • Low Output Noise: 4.7 µVRMS (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
  • 1.0% Accuracy Over Line, Load, and Temperature
  • Low Output Noise: 4.7 µVRMS (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

The TPS7A91 is a low-noise (4.7 µVRMS), 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-µVRMS 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.

The TPS7A91 is a low-noise (4.7 µVRMS), 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-µVRMS 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.
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Technical documentation

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Type Title Date
* Data sheet TPS7A91 1-A, High-Accuracy, Low-Noise LDO Voltage Regulator datasheet PDF | HTML 13 Dec 2016
White paper Demystifying LDO Turn-On (startup) Time PDF | HTML 05 Oct 2024
White paper Parallel LDO Architecture Design Using Ballast Resistors PDF | HTML 14 Dec 2022
White paper Comprehensive Analysis and Universal Equations for Parallel LDO's Using Ballast PDF | HTML 13 Dec 2022
Technical article LDO basics: noise – how a feed-forward capacitor improves system performance PDF | HTML 25 Jul 2017
Technical article LDO basics: noise – how a noise-reduction pin improves system performance PDF | HTML 14 Jun 2017
EVM User's guide TPS7A91EVM-831 Evaluation Module User's Guide 29 Nov 2016

Design & development

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

Evaluation board

TPS7A91EVM-831 — TPS7A91 1A Low-Noise Low-Vin Low-Dropout (LDO) Regulator for Analog Evaluation Module

The TPS7A91EVM-831 evaluation module is designed for a typical configuration to evaluate the operation and performance of the TPS7A91, 1A high-accuracy, low dropout voltage regulator. The EVM circuit board is configured to be a reference design for engineering applications requiring current to a (...)
User guide: PDF
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Simulation model

TPS7A91 PSpice Transient Model

SBVM662.ZIP (92 KB) - PSpice Model
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Simulation model

TPS7A91 Unencrypted PSpice Transient Model

SBVM661.ZIP (2 KB) - PSpice Model
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Calculation tool

PARALLEL-LDO-CALC — Parallel low-dropout (LDO) calculator

The parallel low-dropout (LDO) calculator is a Microsoft® Excel®-based tool that provides worst-case analysis for parallel LDO regulators using ballast resistors. The tool helps the user identify the minimum number of parallel LDO regulators required and optimum ballast resistance for a (...)

Supported products & hardware

Supported products & hardware

Products
Linear & low-dropout (LDO) regulators
TPS7A33 — 1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable TPS7A47 — 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced product, 36-V, 1-A, 4-μVRMS, RF LDO voltage regular TPS7A52 — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A52-Q1 — Automotive 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A53 — 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53-Q1 — Automotive, 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53A-Q1 — Automotive, 3-A, low-VIN 5.6-µVRMS low-noise high-accuracy ultra-low dropout voltage regulator TPS7A53B — 3-A, 1.1-V, low-VIN, low-noise high-accuracy ultra-low-dropout voltage regulator with 0.5-V low VREF TPS7A54 — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A54-Q1 — Automotive 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A83A — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A84A — 3-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A85A — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator TPS7B7702-Q1 — Automotive 300-mA, off-battery (40-V), dual-channel adjustable antenna low-dropout voltage regulator TPS7A8300 — 2-A, low-VIN, low-2-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good wi TPS7A84 — 3-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A85 — 4-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A96 — 2-A, ultra-low noise ultra-high PSRR RF voltage regulator TPS7A4501-SP — Radiation-hardened, QMLV, 1.5-V to 20-V input 1.5-A low-dropout (LDO) regulator TPS7H1111-SP — Radiation-hardened, QMLV and QMLP, 1.5A ultra-low-noise high-PSRR low-dropout (LDO) regulator TPS7H1111-SEP — Radiation-tolerant, 1.5A, ultra-low-noise ultra-high-PSRR RF LDO regulator TPS7A90 — 500-mA, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A91 — 1-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A92 — 2-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy
Hardware development
Evaluation board
TPS7A57EVM-081 — TPS7A57 evaluation module for 5-A low-noise high-accuracy low-dropout (LDO) voltage regulator
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WSON (DSK) 10 Ultra Librarian
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