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TPS7A2401DBVR

200mA 18V ultra-low IQ (3.2uA) LDO regulator, adjustable 1.2-5.5V output, SOT-23-5

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Manufacturer Part：

TPS7A2401DBVR

Package：

SOT-23-5 (2.9 x 1.6 x 1.1mm)

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Description

Product Overview

The TPS7A2401DBVR is a 200mA, 18V ultra-low quiescent current low-dropout (LDO) voltage regulator from Texas Instruments in SOT-23-5 package. The TPS7A24 family features only 3.2uA IQ at no load, making it ideal for always-on battery-powered systems. The adjustable version outputs from 1.2V to 5.5V with 0.5V reference, while fixed voltage variants (01 suffix) provide pre-set outputs. The device supports input voltages from 2.7V to 18V with 200mV dropout at 200mA.

Key Specifications

Output Current 200mA
Input Voltage Range 2.7V to 18V
Dropout Voltage 200mV @ 200mA
Quiescent Current (IQ) 3.2uA (no load)
Output Voltage Accuracy +/-1.5% over temperature
PSRR 65dB @ 1kHz
Output Noise 16uVrms (10Hz-100kHz)
Package SOT-23-5 (2.9 x 1.6mm)
Operating Temperature -40°C to +125°C

Features

  • Ultra-low 3.2uA quiescent current for battery longevity
  • 18V maximum input voltage for industrial and automotive rails
  • 1.2V to 5.5V adjustable output with external resistors
  • Stable with 2.2uF ceramic output capacitor
  • Enable pin with 0.1uA shutdown current
  • Reverse current protection without external diode

Applications

  • Post-regulation after 12V switching converters
  • Battery-powered IoT sensor nodes
  • Always-on MCU power rails in standby systems
  • Industrial 4-20mA loop-powered transmitters
  • Automotive ECU keep-alive power supplies

The TPS7A2401DBVR is a 200mA low-dropout voltage regulator from Texas Instruments in SOT-23-5, designed for ultra-low-power always-on applications. With only 3.2uA quiescent current at no load, it extends battery life by months in standby systems. The 18V maximum input voltage covers 12V automotive and 24V industrial rails with margin. The adjustable output (1.2V to 5.5V) is set via an external resistor divider from the 0.5V feedback reference: VOUT = 0.5V x (1 + R1/R2). The 200mV dropout at 200mA allows 3.3V output from a 3.5V supply. The device is stable with any ceramic output capacitor >= 2.2uF (X5R or X7R recommended). An enable (EN) pin reduces shutdown current to 0.1uA. Reverse current protection prevents damage when VOUT exceeds VIN without an external blocking diode. The -01 suffix denotes the adjustable output variant in SOT-23-5 tape-and-reel packaging.

The TPS7A2401DBVR uses a P-channel MOSFET pass transistor in a source-follower (LDO) configuration. The error amplifier compares the feedback voltage (FB pin) with the internal 0.5V bandgap reference and drives the P-ch gate to maintain regulation. When the load increases, VFB drops below 0.5V; the error amplifier pulls the gate lower, increasing the pass transistor current until VFB returns to 0.5V. The ultra-low 3.2uA IQ is achieved by: (1) a sub-threshold bias circuit that operates at nanoamp current levels; (2) a dynamically biased error amplifier that increases current only when the output deviates from regulation. The dropout voltage (200mV at 200mA) equals ID x RDS(on) of the P-ch pass transistor. The PSRR of 65dB at 1kHz attenuates switching converter ripple; at higher frequencies, PSRR decreases to 30dB at 100kHz. The output noise of 16uVrms (10Hz-100kHz) is suitable for powering precision analog circuits. Reverse current protection uses a comparator that detects when VOUT > VIN and disables the pass transistor, preventing current flow from output to input through the P-ch body diode.

Pin Name Type Function
1 OUT Output Regulated output (200mA max, requires 2.2uF ceramic capacitor for stability)
2 GND Power Ground (connect to PCB ground plane)
3 EN Input Enable (HIGH=on, internal pull-up, LOW=shutdown, 0.1uA Iq)
4 FB Input Feedback (connect resistor divider from OUT to set VOUT: VOUT=0.5V x (1+R1/R2))
5 IN Input Input supply (2.7-18V, connect with 1uF ceramic capacitor)
  • IoT sensor node power: Regulates 12V bus to 3.3V for MCU and radio; 3.2uA IQ ensures years of battery life in sleep mode
  • Automotive keep-alive rail: Powers always-on ECU functions from 12V battery with 18V surge protection; EN pin enables system power sequencing
  • Industrial 4-20mA transmitter: Low-dropout operation from 5V loop-powered supply; low noise (16uVrms) preserves ADC resolution
  • Post-regulation after DC-DC: Filters switching converter ripple with 65dB PSRR at 1kHz, providing clean analog power
Manufacturer Part Number Package Notes
Texas Instruments TPS7A2400DBVR SOT-23-5 Fixed 5.0V output version
Texas Instruments TPS7A2501DBVR SOT-23-5 300mA version, higher current
Analog Devices LT3008ETS8-3.3#TRMPBF TSOT-23-8 3uA IQ, 20mA, 45V, ADI brand
onsemi NCP511SN330T1G SOT-23-5 3.3V 150mA LDO, onsemi brand
Microchip MCP1811AT-033/OT SOT-23-3 3.3V 150mA, 0.1uA IQ, Microchip
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