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TPS7A9101DSKR

1A LDO, 4.7uVrms noise, 70dB PSRR, 0.8-5.2V adj, 200mV dropout, WSON-10, RF/analog power

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Manufacturer Part：

TPS7A9101DSKR

Package：

WSON-10 (2.50 x 2.50 x 0.80 mm, exposed pad)

Brand：

Product Categories：

Integrated Circuits ICs, Low Dropout Regulators (LDO)

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Description

Product Overview

The TPS7A9101DSKR from Texas Instruments is a 1A, ultra-low-noise (4.7uVrms), high-PSRR LDO regulator in a WSON-10 package. With adjustable output from 0.8V to 5.2V and 200mV max dropout at 1A, it powers noise-sensitive RF, ADC, and FPGA circuits.

Key Specifications

Output Current	1 A
Output Voltage	0.8 V to 5.2 V (adjustable)
Input Voltage	1.4 V to 6.5 V
Output Noise	4.7 uVrms (10Hz-100kHz)
PSRR	70 dB at DC, 40 dB at 1MHz
Dropout Voltage	200 mV (max at 1A)
Operating Temperature	-40C to +125C

Features

4.7uVrms ultra-low output noise for sensitive analog circuits
70dB DC PSRR and 40dB at 1MHz for power rail filtering
1% accuracy over line, load, and temperature
200mV max dropout at 1A for efficient regulation
Adjustable soft-start for in-rush current control
Open-drain power-good (PG) output for supply monitoring

Applications

VCO, ADC, and DAC power supply for minimal phase noise
RF transceiver and PLL clean power rails
FPGA and SerDes core/IO voltage regulation
Medical imaging and test instrumentation

Product Introduction:TPS7A9101DSKR Product Introduction

The TPS7A9101DSKR from Texas Instruments is a 1A, high-accuracy, ultra-low-noise, low-dropout (LDO) voltage regulator in a WSON-10 (2.5mm x 2.5mm) package. The output voltage is adjustable from 0.8V to 5.2V using external resistors, with 1% accuracy over line, load, and temperature. The device features 4.7uVrms output noise (10Hz-100kHz) and 70dB PSRR at DC, making it ideal for powering noise-sensitive components such as VCOs, ADCs, DACs, and RF transceivers where minimal phase noise and clock jitter are critical. The wideband PSRR of 40dB at 1MHz effectively filters high-frequency switching regulator ripple. The maximum dropout voltage of 200mV at 1A enables efficient regulation from low-headroom supplies. An adjustable soft-start feature with selectable charging current controls in-rush current during startup. The open-drain power-good (PG) output provides supply monitoring for downstream circuitry.

Working Principle:TPS7A9101DSKR Working Principle

The TPS7A9101DSKR uses a PMOS pass element with advanced BiCMOS error amplifier for ultra-low-noise regulation. (1) Pass Element: A P-channel MOSFET provides the low 200mV dropout at 1A. The PMOS gate is driven by a high-gain error amplifier that compares a fraction of the output voltage to an internal 0.8V bandgap reference. (2) Noise Reduction: An external capacitor (CNR/SS) on the NR/SS pin filters the bandgap reference noise, reducing the output noise from approximately 12uVrms (without CNR) to 4.7uVrms (with 100nF CNR). This is critical for achieving sub-5uVrms noise performance. (3) PSRR: The high loop gain of the error amplifier provides 70dB PSRR at DC. The wideband PSRR of 40dB at 1MHz is achieved by the high bandwidth of the regulation loop. A feed-forward capacitor (CFF) across the top feedback resistor further improves high-frequency PSRR. (4) Soft-Start: The NR/SS pin also serves as the soft-start control. The external capacitor controls the reference voltage ramp-up rate, limiting in-rush current. (5) PG: The open-drain power-good output asserts when the output voltage reaches 90% of the target value.

Pin Description:TPS7A9101DSKR Pin Definition and Functions

Pin	Name	Type	Function
1	OUT	Output	Regulated output voltage
2	OUT	Output	Regulated output voltage
3	PG	Output	Power-good (open-drain)
4	SS_CTRL	Input	Soft-start current select (GND=fast, float=slow)
5	EN	Input	Enable (active high)
6	NR/SS	Analog	Noise reduction / soft-start capacitor
7	FB	Input	Feedback voltage (0.8V reference)
8	GND	Ground	Ground
9	IN	Input	Input supply (1.4-6.5V)
10	IN	Input	Input supply (1.4-6.5V)

Application Scenarios:In which products and applications isTPS7A9101DSKR used

VCO, ADC, and DAC power supply with 4.7uVrms noise for minimal phase noise
RF transceiver and PLL clean power rails with 70dB PSRR at DC
FPGA and SerDes core/IO voltage regulation at 1A with 200mV dropout
Medical imaging and test instrumentation with 1% output accuracy

Alternative Models:What chips are recommended as replacements for TPS7A9101DSKR

Manufacturer	Part Number	Package	Notes
TI	TPS7A9101DSKT	WSON-10	Small reel packaging
TI	TPS7A8101SKDR	SON-8	1A, 23.5uVrms noise
ADI	LT3045EMSE-1#PBF	MSOP-10	500mA, 0.8uVrms noise
TI	TPS7A4700RGWR	VQFN-20	1A, 3.8uVrms, higher PSRR