Key facts
- Model
- LP3985
- Industry
- Industrial
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- Last added
- 2012-06-04
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National Semiconductor LP3985 Datasheet
The LP3985 is a micropower LDO designed for portable and wireless applications with demanding space requirements. It operates from a 2.5 V to 6 V input and is stable with a 1 pF +30 % ceramic or high‑quality tantalum output capacitor, allowing a PCB area smaller than 2.0 mm × 2.5 mm.
Key features include ultra‑low output noise, fast turn‑on (200 µs typ.), low quiescent current (<1.5 µA in shutdown), high power‑supply rejection (500 dB at 1 kHz), and thermal shutdown protection. The device is offered in several micro‑SMD and SOT‑23‑5 packages and operates from –40 °C to +125 °C.
National Semiconductor LP3985 specifications
| Input voltage range | 2.5 V to 6.0 V |
|---|---|
| Maximum output current | 150 mA |
| Power‑supply rejection ratio (PSRR) | 500 dB at 1 kHz |
| Quiescent current (shutdown) | <1.5 µA |
| Turn‑on time (typ.) | 200 µs |
| Maximum dropout voltage (150 mA load) | 100 mV |
| Operating temperature range | –40 °C to +125 °C |
| Available packages | 5‑bump micro SMD, thin micro SMD, 5‑pin SOT‑23 |
All National Semiconductor LP3985 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 LP3985?
The LP3985 provides up to 150 mA of guaranteed output current.
What is the typical turn‑on time of the LP3985?
The typical turn‑on time is 200 µs.
What is the maximum output current of the LP3985?
The LP3985 can deliver up to 150 mA of output current.
From: National Semiconductor LP3985 Voltage Regulator Datasheet
What is the quiescent current when the device is shut down?
The shutdown quiescent current is less than 1.5 µA.
From: National Semiconductor LP3985 Voltage Regulator Datasheet