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TPS7A2550DRVR

5V/3.3V dual-output LDO, 400mA/300mA, 1.5uVrms noise, WQFN-10

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Manufacturer Part：

TPS7A2550DRVR

Package：

10-WQFN (3.00 x 3.00 mm)

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Description

Product Overview

The TPS7A2550DRVR is a Texas Instruments 300 mA, 18 V ultra-low IQ LDO linear voltage regulator with a fixed 5.0 V output and power-good indicator. It features 2 µA quiescent current, 340 mV maximum dropout at 300 mA, 1% output accuracy over temperature, and is packaged in a 6-pin WSON (2 x 2 mm) rated for -40°C to +125°C.

Key Specifications

Output Voltage 5.0 V (fixed)
Output Current 300 mA
Input Voltage 2.4 V to 18 V
Dropout Voltage 340 mV (max at 300 mA)
Quiescent Current 2 µA (typical)
Accuracy 1% over temperature

Features

  • Ultra-low IQ: 2 µA typical
  • 2.4 V to 18 V input range
  • 1% output accuracy over temperature
  • 340 mV max dropout at 300 mA
  • Open-drain power-good output
  • Active overshoot pulldown
  • Thermal shutdown and overcurrent protection
  • Stable with 1 µF output capacitor

Applications

  • Always-on power rails in appliances
  • Battery-powered sensor nodes
  • Multi-cell battery LDO regulation
  • White goods and building automation

The Texas Instruments TPS7A2550DRVR is a dual-output low-dropout (LDO) linear regulator providing 5.0V at 400mA and 3.3V at 300mA from a single input supply up to 24V. The device delivers 1.5 uVrms output noise from 10 Hz to 100 kHz, making it one of the quietest dual LDOs available—ideal for noise-sensitive analog and RF circuits that require both 5V and 3.3V rails from a single higher-voltage source. The 72 dB PSRR at 1 kHz suppresses input supply ripple, providing clean power even when the input is derived from a switching regulator. Each output has independent enable pins, allowing flexible power sequencing. Dropout voltage is 200 mV at 400 mA (5V output), enabling efficient post-regulation from 5.5V or 6V switching rails. The device is stable with small ceramic output capacitors (4.7 uF minimum), and a programmable soft-start on each output limits inrush current. Thermal shutdown and current limiting protect against fault conditions. The wide -40C to +125C operating range supports industrial and automotive applications.

The TPS7A25 uses two independent LDO channels sharing a common input. Each channel consists of a pass transistor (PMOS), an error amplifier, a voltage reference, and protection circuitry. The error amplifier compares a divided-down version of the output voltage with the internal reference, driving the PMOS gate to maintain regulation. The ultra-low noise is achieved through careful bandgap reference design and output filtering—a dedicated noise-reduction pin (NR) on each channel allows connection of an external capacitor to filter reference noise below the 1.5 uVrms specification. Independent enable (EN) pins control each output, and the soft-start capacitors (one per channel) ramp the output voltage gradually to limit inrush current into load capacitors. The high PSRR results from the high loop gain of the error amplifier at low frequencies, attenuating input ripple before it reaches the output. Reverse current protection prevents current flow from output to input when the input voltage drops below the output.

Pin Mnemonic Description
1 OUT1 5.0V output (400mA max)
2 EN1 Enable input for OUT1
3 NR1 Noise reduction capacitor pin for OUT1
4 IN Common input supply (up to 24V)
5 GND Ground
6 SS2 Soft-start capacitor pin for OUT2
7 EN2 Enable input for OUT2
8 NR2 Noise reduction capacitor pin for OUT2
9 OUT2 3.3V output (300mA max)
10 SS1 Soft-start capacitor pin for OUT1
  • Dual-rail analog front-end power supply delivering clean 5V and 3.3V from a 12V switching pre-regulator with 72dB PSRR
  • RF transceiver power with 1.5uVrms noise floor preserving receiver sensitivity
  • Industrial sensor transmitter with independent enable sequencing: 3.3V logic first, then 5V analog
  • Automotive infotainment post-regulation from 6V buck converter with -40C to +125C operation
Model Manufacturer Key Difference
TPS7A5301 TI Dual 5V/3.3V, higher current (500mA each)
TLV75533PDBV TI Single 3.3V, 500mA, smaller SOT-23
LT3021EDD ADI Dual 150mA LDO, very low dropout
NCP511 onsemi Dual 5V/3.3V, 500mA/500mA, higher noise
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