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National LP3999 Low Noise 150mA Voltage Regulator Datasheet
The LP3999 regulator is designed for portable wireless and battery‑powered applications, providing accurate output voltage with low noise and low quiescent current. It includes an enable pin for virtually zero power consumption when disabled and internal short‑circuit and over‑temperature protection.
Key features include a 2.5 V‑6.0 V input range, fixed output options from 1.5 V to 3.3 V, 60 mV typical dropout at 150 mA, 10 µVrms output noise (10 Hz‑100 kHz), and a guaranteed 150 mA output current. The device is offered in 5‑pin micro‑SMD and 6‑pin LLP packages and operates from –40 °C to +125 °C.
National Semiconductor LP3999 specifications
| Input Voltage Range | 2.5 V to 6.0 V |
|---|---|
| Output Voltage Range | 1.5 V to 3.3 V (fixed options) |
| Typical Dropout Voltage (150 mA load) | 60 mV |
| Quiescent Current (disabled) | Virtually zero (≈3 nA) |
| Output Noise | 10 µVrms (10 Hz‑100 kHz) |
| Maximum Output Current | 150 mA |
| Thermal Shutdown Temperature | 160 °C |
Source: National LP3999 Low Noise 150mA Voltage Regulator Datasheet
All National Semiconductor LP3999 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the typical dropout voltage at a 150 mA load?
The typical dropout voltage is 60 mV.
From: National LP3999 Low Noise 150mA Voltage Regulator Datasheet
How low is the quiescent current when the regulator is disabled?
When disabled, the regulator draws virtually zero current, about 3 nA.
From: National LP3999 Low Noise 150mA Voltage Regulator Datasheet
What is the enable input voltage range?
The enable pin accepts voltages from 0 V up to 6.0 V.
From: National Semiconductor LP3999 Low Noise 150mA Voltage Regulator Datasheet
Which package types are available for the LP3999?
It is offered in a 5‑pin micro‑SMD package and a 6‑lead LLP (SOT23) package.
From: National Semiconductor LP3999 Low Noise 150mA Voltage Regulator Datasheet