Key facts
- Model
- LP3990
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-06-05
Start here
National Semiconductor LP3990 150mA Linear Voltage Regulator for Digital Applications handbook
The LP3990 is a 150mA linear voltage regulator designed for portable, battery-powered systems providing an accurate output voltage, low noise, and low quiescent current. The LP3990 will provide a 0.8V output from the low input voltage of 2V at up to 150mA load current. When switched into shutdown mode via a logic signal at the enable pin, the power consumption is reduced to virtually zero. The LP3990 is designed to be stable with space saving ceramic capacitors as small as 0.47µF. Performance is specified for a -40˚C to 125˚C junction tem- perature range. For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V, 2.8V, or 3.3V please contact your local NSC sales office.
Read onlineNational Semiconductor LP3990 specifications
| Input Voltage Range | 2 V to 6 V |
|---|---|
| Output Voltage Range | 0.8 V to 3.3 V (selectable) |
| Maximum Output Current | 150 mA |
| Power Supply Rejection Ratio (PSRR) | 55 dB at 1 kHz |
| Turn‑On Time (to 95 % output) | 80 µs (0.8 V), 105 µs (1.5 V), 175 µs (3.3 V) |
| Dropout Voltage | 120 mV (0.8 V), 200 mV (1.5 V) |
| Thermal Shutdown Temperature | 155 °C |
Source: National Semiconductor LP3990 Linear Voltage Regulator Datasheet
All National Semiconductor LP3990 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the maximum output current of the LP3990?
The LP3990 can supply up to 150 mA of output current.
From: National Semiconductor LP3990 Linear Voltage Regulator Datasheet
What packages are available for the LP3990?
It is offered in a 4‑pin micro SMD package and a 6‑pin LLP (SOT‑23) package, both with lead‑free options.
From: National Semiconductor LP3990 Linear Voltage Regulator Datasheet