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TPS72018DRVR

350mA LDO, 1.8V fixed output, ultra-low VIN (1.1V), 38μA IQ, high PSRR, WSON-6

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Manufacturer Part：

TPS72018DRVR

Package：

WSON-6 (2 x 2 x 0.75 mm)

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Description

Product Overview

The TPS72018DRVR from Texas Instruments is a 350mA, ultra-low VIN, high-PSRR, low-IQ, low-dropout linear regulator with a fixed 1.8V output. Featuring a bias pin architecture and WSON-6 package, it delivers outstanding AC performance with only 38μA quiescent current, making it ideal for battery-powered and RF-sensitive applications.

Key Specifications

Output Voltage 1.8V (fixed)
Maximum Output Current 350 mA
Input Voltage Range 1.1V to 4.5V
Dropout Voltage 110 mV @ 350mA
Quiescent Current 38 μA
PSRR 80 dB (VIN, 10Hz-10kHz)
Output Noise 48 μVRMS (10Hz-100kHz)
Package WSON-6 (2×2 mm)
Operating Temperature -40°C to +125°C

Features

  • Ultra-low VIN operation down to 1.1V for maximum efficiency
  • Dual-rail architecture with separate VIN and VBIAS supplies
  • Excellent load transient response: ±15mV for 0-350mA in 1μs
  • High PSRR: 80dB VIN, 70dB VBIAS (10Hz-10kHz)
  • Built-in soft-start with monotonic VOUT rise
  • Overcurrent and thermal protection
  • Stable with 2.2μF ceramic output capacitor

Applications

  • RF and wireless communication power supplies
  • Battery-powered portable devices
  • Post-regulation for DC-DC converters
  • Smartphone and tablet power management
  • Wearable electronics and IoT sensors

The TPS72018DRVR is a dual-rail, low-dropout linear regulator from Texas Instruments that offers outstanding AC performance including high PSRR and excellent load and line transient response while consuming only 38μA of quiescent current. The device features a unique bias pin architecture where the VBIAS rail powers the internal control circuitry and can be connected to any supply equal to or greater than 1.4V above the output voltage, while the main power path through VIN can operate as low as VOUT + VDO. This dual-rail approach enables high efficiency in power-sensitive applications where VIN can be sourced from a preceding DC-DC converter output. The fixed 1.8V output version supports up to 350mA load current with only 110mV dropout, and includes built-in soft-start, overcurrent, and thermal protection.

The TPS72018DRVR operates using a dual-rail LDO architecture. (1) The main power path flows from VIN through a P-channel pass transistor to the OUT pin, with VIN capable of operating as low as 1.1V to maximize efficiency in battery-powered applications. (2) The bias rail (VBIAS) powers the internal control circuitry including the error amplifier and bandgap reference, requiring at least 1.4V above the output voltage. This separation allows the control loop to maintain regulation even when VIN is very close to VOUT. (3) The error amplifier compares a fraction of the output voltage against the internal bandgap reference (1.8V set point), driving the pass transistor gate to maintain regulation. The integrated soft-start circuit limits inrush current to 100mA + ILOAD during startup, while overcurrent and thermal shutdown circuits provide fault protection.

Pin Name Function
1 OUT Regulated output voltage (1.8V)
2 NC No connection
3 EN Enable input (active high)
4 BIAS Bias supply input for internal circuitry
5 GND Ground
6 IN Main power supply input
Pad GND Thermal pad (connect to ground)
  • RF power supply for wireless transceivers requiring high PSRR and low noise
  • Post-regulation stage after DC-DC buck converters in portable devices
  • IoT sensor node power management with ultra-low quiescent current
  • Smartphone and wearable device always-on power rails
  • Battery-powered instrumentation requiring clean 1.8V supply
Model Manufacturer Key Difference
TPS72012DRVR TI 1.2V fixed output version
TPS72033DRVR TI 3.3V fixed output version
TLV75801PDRVR TI Adjustable output, 500mA, WSON-6
TPS79333DBVR TI 3.3V LDO, 150mA, SOT-23-5
AP2112K-1.8 Diodes Inc 1.8V LDO, 600mA, SOT-23-5
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