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TPS7A4501DCQR

1.5A adjustable LDO, 1.21-20V output, 300mV dropout, 35uVrms noise, SOT-223-6

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Manufacturer Part：

TPS7A4501DCQR

Package：

6-SOT-223 (6.50 x 7.06 mm)

Brand：

Product Categories：

Integrated Circuits ICs, Low Dropout Regulators (LDO)

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Description

Product Overview

The TPS7A4501DCQR is a Texas Instruments 1.5 A, 20 V low-noise fast-transient-response LDO voltage regulator with adjustable output from 1.21 V to 20 V. It features 300 mV dropout, 35 µVRMS output noise, 68 dB PSRR at 1 kHz, reverse current protection, and is packaged in a 6-pin SOT-223 rated for -40°C to +125°C.

Key Specifications

Output Current	1.5 A
Input Voltage	Up to 20 V
Output Range	1.21 V to 20 V (adjustable)
Dropout Voltage	300 mV at 1.5 A
Output Noise	35 µVRMS (10 Hz-100 kHz)
PSRR	68 dB at 1 kHz

Features

Optimized for fast transient response
1.5 A output current
300 mV dropout at 1.5 A
35 µVRMS output noise
68 dB PSRR at 1 kHz
1 mA quiescent current, <1 µA in shutdown
Reverse-battery and reverse-current protection
Stable with 10 µF ceramic capacitor

Applications

RF and PLL power supply
Post-regulation after switching converter
FPGA and DSP core voltage
High-speed ADC/DAC supply

Product Introduction:TPS7A4501DCQR Product Introduction

The Texas Instruments TPS7A4501DCQR is a 1.5A low-dropout linear regulator with an adjustable output voltage from 1.21V to 20V and input voltage range up to 20V. The 300 mV dropout voltage at 1.5A full load makes it efficient for post-regulation from 12V or 19V bus rails, while the 35 uVrms output noise (10 Hz to 100 kHz) and 68 dB PSRR at 1 kHz make it ideal for noise-sensitive RF and precision analog circuits. The quiescent current is well-controlled at 1 mA and does not increase in dropout—a common failure mode of other LDOs that can cause thermal runaway. In shutdown mode, quiescent current drops below 1 uA. The device is stable with just 10 uF of ceramic output capacitance (no ESR requirements), simplifying PCB layout. Internal protection includes reverse-battery protection, reverse current protection, current limiting, and thermal shutdown. The SOT-223-6 package with exposed tab provides good thermal performance for the 1.5A output current, with a theta-JA of approximately 31C/W on a standard 4-layer PCB. The -40C to +125C operating range supports industrial and automotive applications.

Working Principle:TPS7A4501DCQR Working Principle

The TPS7A4501 uses a PMOS pass transistor controlled by an error amplifier that compares a divided version of the output voltage with the internal 1.21V reference. The adjustable output is set by two external resistors: VOUT = 1.21V x (1 + R1/R2) + IADJ x R1, where IADJ is the ADJ pin bias current (typically 0.5 uA). The fast transient response results from wide error amplifier bandwidth and low output impedance—when a load step occurs, the error amplifier quickly adjusts the PMOS gate drive to maintain regulation. The low noise is achieved through careful reference design and the use of a noise-reduction capacitor on the ADJ pin (optional). Reverse current protection monitors the voltage differential between input and output—if VOUT exceeds VIN by more than approximately 300 mV, an internal switch disconnects the output from the input, preventing current flow back to the source. This feature is critical in systems where multiple supply rails may power up and down at different times. The controlled quiescent current in dropout means the device does not draw excessive current when VIN-VOUT drops below the regulation threshold, preventing the thermal issues that plague conventional LDOs.

Pin Description:TPS7A4501DCQR Pin Definition and Functions

Pin	Mnemonic	Description
1	IN	Input supply (2.5-20V)
2	GND	Ground
3	EN	Enable input (active high)
4	ADJ	Adjustment feedback pin (connect to output for 1.21V)
5	OUT	Regulated output
6	Tab	Thermal pad (connect to GND or OUT per application)

Application Scenarios:In which products and applications isTPS7A4501DCQR used

Post-regulation of 12V buck converter to clean 5V for RF power amplifier with 68dB PSRR and 35uVrms noise
Adjustable bench power supply output stage with 1.21-20V range and 1.5A capability
Industrial PLC analog I/O module requiring low-noise 15V reference from 19V input with reverse current protection
Automotive infotainment system 3.3V rail from 5V source with -40C to +125C operation and controlled Iq in dropout

Alternative Models:What chips are recommended as replacements for TPS7A4501DCQR

Model	Manufacturer	Key Difference
TL1963ADCQR	TI	Same package, higher noise (~40uVrms), no reverse current protection
TPS7A5201RPSR	TI	Lower noise (4.4uVrms), but Vin max only 6.5V
LT1764AEQ	ADI	1.1A, 20V input, lower noise (20uVrms), higher cost
NCP4681	onsemi	1.5A, 18V input, lower PSRR, lower cost