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LP2981AIM5-3.3/NOPB

TI LDO regulator, 3.3V fixed, 100mA, 200mV dropout, SOT-23-5, -40 to 125C

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Manufacturer Part：

LP2981AIM5-3.3/NOPB

Package：

SOT-23-5 (DBV)

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Description

Product Overview

The LP2981AIM5-3.3/NOPB is a 3.3V fixed-output low-dropout (LDO) linear regulator from Texas Instruments. Featuring an ultra-low dropout voltage of 200 mV at 100 mA, low quiescent current of 65 uA, and SOT-23-5 package, this regulator is designed for battery-powered and noise-sensitive applications requiring a clean, stable 3.3V supply rail.

Key Specifications

Series LP2981
Output Voltage 3.3V (fixed)
Maximum Output Current 100 mA
Dropout Voltage 200 mV at 100 mA (typical)
Input Voltage Range 2.5V to 16V
Quiescent Current 65 uA (typical, no load)
Shutdown Current 0.01 uA (typical)
Output Noise 160 uVrms (300 Hz to 50 kHz)
PSRR at 1 kHz 63 dB
Output Accuracy +/-0.75% (A grade)
Package SOT-23-5 (DBV)
Operating Temperature -40C to +125C (A grade)
Enable Pin Yes (active high)
Bypass Pin Yes (for noise reduction)

Features

  • Ultra-low 200 mV dropout at 100 mA output
  • Very low quiescent current of 65 uA extends battery life
  • Near-zero shutdown current (0.01 uA) for power gating
  • Integrated enable pin for ON/OFF control
  • Bypass pin for external noise reduction capacitor
  • Low output noise ideal for RF and analog circuits
  • Over-temperature and over-current protection
  • SOT-23-5 footprint for compact designs

Applications

  • Battery-powered portable instruments
  • RF module power supply
  • Microcontroller 3.3V rail regulation
  • Sensor analog supply with low noise requirements
  • USB peripheral power management

The Texas Instruments LP2981AIM5-3.3/NOPB is a 3.3V fixed-output ultra-low-dropout (LDO) linear regulator optimized for battery-powered and noise-sensitive applications. With only 200 mV dropout at 100 mA output and 65 uA quiescent current, this regulator maximizes battery utilization while providing a clean 3.3V supply rail. The A-grade version supports the full -40C to +125C temperature range with +/-0.75% output accuracy. The enable pin enables power gating, while the bypass pin allows an external noise-reduction capacitor for ultra-low output noise performance.

The LP2981AIM5-3.3/NOPB uses a PNP pass transistor in a low-dropout configuration. Unlike NPN-based regulators that require the input voltage to exceed the output by at least 1.5-2V, the PNP pass element allows operation with only 200 mV of headroom. A bandgap reference provides a stable voltage reference, while an error amplifier compares a fraction of the output voltage (via internal resistor divider for fixed versions) with the reference and adjusts the pass transistor drive to maintain regulation. The bypass pin allows connecting an external capacitor to the reference node, forming a low-pass filter that reduces reference noise. The enable pin controls a bias circuit that can shut down the device to 0.01 uA, and over-current/over-temperature protection ensures safe operation under fault conditions.

Pin Name Type Function
1 OUT Output Regulated 3.3V output
2 GND Ground Ground reference
3 EN Input Enable (active high) – pull high to enable
4 BYP Input Bypass – connect 0.01uF cap to GND for noise reduction
5 IN Input Unregulated input supply (up to 16V)
  • 3.3V MCU power rail from Li-ion battery (3.7-4.2V)
  • RF module clean 3.3V supply from noisy 5V rail
  • Sensor analog 3.3V reference supply
  • USB peripheral LDO with enable power gating
  • Portable medical device 3.3V regulation
Manufacturer Part Number Package Notes
TI TLV1117LV33DCYR SOT-223 Higher current (800mA) LDO
Microchip MIC5219-3.3YM5 SOT-23-5 Comparable LDO, 150mA
ADI/Maxim MAX8867EUK33+T SOT-23-5 3.3V LDO, 150mA
Richtek RT9013-33GB SOT-23-5 3.3V LDO, 300mA
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