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National Semiconductor LP2981 Micropower 100 mA Ultra Low‑Dropout Regulator Datasheet
The LP2981 Micropower 100 mA Ultra Low‑Dropout Regulator is designed for battery‑powered applications. It offers a very low dropout voltage, precise output, and minimal quiescent current, making it suitable for cellular phones, PDAs, camcorders and other portable devices.
Key features include a typical 200 mV dropout at 100 mA load, ground‑pin current of 600 µA at full load, sleep‑mode current below 1 µA, and eleven fixed output‑voltage options from 2.5 V to 5.0 V. The device operates from 2.1 V to 16 V supply, tolerates −40 °C to +125 °C junction temperature, and provides a guaranteed 100 mA output current.
National Semiconductor LP2981 specifications
| Dropout Voltage (typical) | 200 mV @ 100 mA load |
|---|---|
| Ground Pin Current (typical) | 600 µA @ 100 mA load |
| Sleep‑mode Quiescent Current | < 1 µA |
| Output Voltage Tolerance | ±0.75 % |
| Input Supply Voltage (operating) | 2.1 V to 16 V |
| Operating Junction Temperature Range | −40 °C to +125 °C |
| Maximum Output Current | 100 mA (guaranteed) |
| Available Output Voltages | 2.5 V – 5.0 V (eleven options) |
Source: National Semiconductor LP2981 Micropower 100 mA Ultra Low‑Dropout Regulator Datasheet
All National Semiconductor LP2981 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the typical dropout voltage of the LP2981?
The typical dropout voltage is 200 mV at a 100 mA load.
From: National Semiconductor LP2981 Micropower 100 mA Ultra Low‑Dropout Regulator Datasheet
How much quiescent current does the LP2981 draw in sleep mode?
In sleep mode the device draws less than 1 µA when the ON/OFF pin is pulled low.
From: National Semiconductor LP2981 Micropower 100 mA Ultra Low‑Dropout Regulator Datasheet
What is the dropout voltage at 100 mA load?
The typical dropout voltage is 200 mV at a 100 mA load.
From: National Semiconductor LP2981 Ultra Low-Dropout Regulator Datasheet
What is the ground pin current at 1 mA load?
The ground pin current is typically 80 pA at a 1 mA load.
From: National Semiconductor LP2981 Ultra Low-Dropout Regulator Datasheet
What is the typical dropout voltage of the LP2981?
The typical dropout voltage is 200 mV at a 100 mA load.
From: National Semiconductor LP2981 Ultra Low-Dropout Regulator Datasheet
What is the output voltage accuracy of the LP2981?
The regulator provides a 0.75 % tolerance output voltage (A‑grade).
From: National Semiconductor LP2981 Ultra Low-Dropout Regulator Datasheet