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TPS73701DRVR

1A ultra-LDO, 122mV dropout, NMOS, reverse current protection, WSON-6

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Manufacturer Part：

TPS73701DRVR

Package：

WSON-6 (2.0 × 2.0 × 0.8 mm, exposed pad)

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Description

Product Overview

The TPS73701DRVR is a 1A ultra-low-dropout voltage regulator from Texas Instruments with reverse current protection, packaged in a 6-pin WSON (DRV) package. It features an NMOS pass transistor architecture with a typical dropout voltage of 122 mV at 1A, adjustable output from 1.20V to 5.5V, and shutdown quiescent current below 20 nA. The device is stable with just a 1 µF ceramic output capacitor.

Key Specifications

Function 1A Ultra-LDO with Reverse Current Protection
Input Voltage 2.2V to 5.5V
Output Voltage 1.20V to 5.5V (adjustable)
Output Current 1A
Dropout Voltage 122 mV (typ) at 1A
Accuracy 1% initial, 1.5% overall
Shutdown Current < 20 nA
Topology NMOS pass transistor (voltage follower)
Reverse Current Protection Yes — prevents backflow
Package WSON-6 (2.0 × 2.0 mm)
Operating Temperature -40°C to +125°C

Features

  • Ultra-low dropout: 122 mV typical at 1A
  • Reverse current protection prevents backflow from output to input
  • NMOS voltage-follower topology for excellent transient response
  • Shutdown current below 20 nA for ultra-low standby power
  • Stable with just 1 µF ceramic output capacitor
  • Enable pin, thermal shutdown, and foldback current limit

Applications

  • DSP, FPGA, and ASIC point-of-load core voltage regulation
  • Post-regulation after switching converters for noise-sensitive rails
  • Battery-powered systems requiring ultra-low standby current
  • Portable medical and industrial instrumentation
  • Server memory VTT and VDDQ termination power

The TPS73701 is a 1A low-dropout linear regulator featuring an NMOS pass transistor in a voltage-follower configuration. This architecture provides several advantages over PMOS-based LDOs: excellent transient response due to the low output impedance of the source follower, no need for a low-ESR output capacitor for stability, and inherent reverse current blocking when the output voltage exceeds the input. The device achieves a typical dropout voltage of 122 mV at 1A with the new silicon revision, and the adjustable output voltage can be set from 1.20V to 5.5V using an external resistor divider. The shutdown mode reduces current consumption to below 20 nA, making it ideal for always-on battery-powered systems.

The TPS73701 uses an NMOS pass transistor in a common-drain (source-follower) configuration. The error amplifier drives the gate of the NMOS transistor to regulate the output voltage, comparing the feedback voltage with the internal 1.2V reference. Because the NMOS transistor acts as a voltage follower, the output impedance is inherently low (1/gm), providing excellent load transient response with minimal output capacitance. The reverse current protection circuit monitors the input-output differential voltage; when VOUT exceeds VIN, the NMOS gate is pulled low to prevent current backflow from the output to the input, protecting upstream circuitry. The enable (EN) pin controls the gate drive; when disabled, the gate is pulled to ground and the shutdown current drops below 20 nA. Foldback current limit reduces the short-circuit current to protect the device during fault conditions.

Pin Name Type Function
1 OUT Output Regulated output voltage
2 OUT Output Regulated output voltage (parallel)
3 FB Input Feedback — connect resistor divider from output
4 EN Input Enable — active high, pull low for shutdown
5 GND Power Ground
6 IN Power Input supply (2.2-5.5V)
EP Thermal Pad Power Exposed pad — connect to GND plane
  • FPGA VCCINT 1.0V core rail post-regulation from 1.2V switching pre-regulator
  • DDR3/4 VTT termination supply with reverse current protection during suspend
  • Battery-powered IoT sensor always-on 1.8V rail with < 20 nA shutdown
  • Medical implantable device power management with ultra-low standby
  • Noise-sensitive ADC reference supply post-regulation from switching output
Manufacturer Part Number Package Notes
TI TPS73733DRVR WSON-6 3.3V fixed output variant
TI TPS7A7001DSKR SON-8 2A, 5.5V, ultra-low noise LDO
ADI LT1764AEQ DD-Pak-5 3A, 20V, low noise LDO
Maxim MAX8904 DFN-8 500mA LDO with reverse protection
Richtek RT9080 SOT-23-5 300mA, 5.5V, low noise LDO
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