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TPS73701DRBT

1A LDO regulator, adj 1.2-5.5V, 130mV dropout, rev current prot, VSON-8 3x3mm

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Manufacturer Part：

TPS73701DRBT

Package：

VSON-8 / DRB (3.00 x 3.00 x 0.88 mm)

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Description

Product Overview

The TPS73701DRBT from Texas Instruments is a 1A low-dropout (LDO) linear regulator with reverse current protection and adjustable output (1.2V to 5.5V). Using an NMOS pass element, it achieves 130 mV typical dropout at 1A and is stable with only 1 uF ceramic output capacitor. The DRBT suffix denotes the 8-pin VSON (3x3mm) package in tape-and-reel.

Key Specifications

Type 1A LDO Linear Regulator (Adjustable)
Output Current 1 A
Input Voltage 2.2V – 5.5V
Output Voltage 1.2V – 5.5V (adjustable via FB)
Dropout Voltage 130 mV (typical at 1A)
Accuracy 1% initial, 3% over line/load/temp
PSRR 33 dB @ 100 kHz
Output Noise 48 uVrms (10 Hz – 100 kHz)
Quiescent Current 400 uA (typical)
Shutdown IQ < 20 nA (typical)
Stability 1 uF ceramic output capacitor
Protection Reverse current, thermal shutdown, foldback current limit
Package VSON-8 (DRB, 3 x 3 mm)
Operating Temp -40 to 125 C

Features

  • NMOS topology for low reverse leakage current
  • Ultra-low 130 mV dropout at 1A
  • Stable with only 1 uF ceramic output capacitor
  • Adjustable output from 1.2V to 5.5V via FB resistor divider
  • Reverse current protection prevents back-driving
  • < 20 nA shutdown current for battery-powered applications
  • 1% initial output voltage accuracy
  • Thermal shutdown and foldback current limit protection

Applications

  • Portable electronics: Ultra-low IQ shutdown for battery life
  • Post-regulation for switching supplies: 33 dB PSRR
  • FPGA and DSP core power: Adjustable 1.2V-1.8V
  • USB-powered devices: 5V to 3.3V regulation
  • Industrial sensors: Wide -40 to 125 C operation

The TPS73701DRBT from Texas Instruments is a 1A low-dropout linear regulator with an NMOS pass element that provides reverse current protection and ultra-low dropout voltage. The adjustable output version supports 1.2V to 5.5V via an external resistor divider on the FB pin. The NMOS voltage-follower topology achieves 130 mV typical dropout at 1A and is inherently stable with just 1 uF ceramic output capacitor, independent of ESR. Reverse current protection prevents current flow from output to input when the input voltage drops below the output, eliminating the need for external blocking diodes. The device features 1% initial accuracy, < 20 nA shutdown current, and thermal shutdown with foldback current limiting.

The TPS73701DRBT uses an NMOS pass transistor in a voltage-follower (common-drain) configuration. Unlike PMOS LDOs, the NMOS topology does not require a gate drive voltage above VOUT, resulting in naturally low reverse leakage and excellent load transient response. The internal error amplifier compares the FB pin voltage to a 1.216V bandgap reference and drives the NMOS gate to maintain regulation. Reverse current protection uses a comparator that monitors the input-to-output differential; when VOUT exceeds VIN, the NMOS gate is driven off to block reverse current. The foldback current limit reduces the current limit during a fault, reducing power dissipation under short-circuit conditions. The EN pin controls an internal switch that disconnects the bias circuitry, achieving < 20 nA shutdown current.

Pin Name Type Function
1 OUT Power Regulated output (connect to load)
2 OUT Power Regulated output (connect to load)
3 FB Input Feedback input (connect resistor divider)
4 GND Ground Ground
5 NC – No connect
6 EN Input Enable (HIGH = on, LOW = shutdown)
7 IN Power Unregulated input supply
8 IN Power Unregulated input supply
  • Battery devices: < 20 nA shutdown current maximizes battery life in always-on systems
  • FPGA/DSP core: Adjustable 1.2V/1.5V/1.8V from 3.3V rail with low dropout
  • Post-regulation: 33 dB PSRR cleans switching supply ripple for sensitive analog
  • USB peripherals: 5V to 3.3V/1.8V regulation with reverse current protection
  • Industrial sensors: -40 to 125 C operation with thermal and current protection
Manufacturer Part Number Package Notes
TI TPS73733DRBT VSON-8 Fixed 3.3V version, same topology
TI TPS7A3701DRBR VSON-8 1% total accuracy, improved performance
ADI LT1764AEQ-1.8 DD-Pak-5 3A LDO, adjustable, low noise
TI TLV75501PDBVR SOT-23-5 500mA LDO, adjustable, ultra-small
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