TPS7A91

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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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TPS7A91

ACTIVE

Data sheet

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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 µV_RMS (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 µV_RMS (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 µV_RMS), 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-µV_RMS 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 µV_RMS), 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-µV_RMS 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

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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