LP3983 is a micro power, low quiescent current, CMOS voltage regulator in micro SMD package manufactured by National Semiconductor Corporation.
The LP3983 is a fixed‑voltage, low‑current regulator designed for standby‑type, battery‑powered equipment. It operates from 2.5 V to 6.0 V input and provides output voltages of 1.6 V, 1.8 V or 2.5 V with a maximum output current of 5 mA. The device features a logic‑controlled enable pin, virtually zero quiescent current when disabled, and short‑circuit protection.
The regulator is supplied in a 5‑pin micro‑SMD package (TLA05) and is intended for use with small ceramic capacitors. Detailed electrical characteristics, absolute maximum ratings, and application hints—including power‑dissipation calculations and mounting guidelines—are provided.
| Input Voltage Range | 2.5 V to 6.0 V |
|---|---|
| Output Voltage Options | 1.6 V, 1.8 V, 2.5 V |
| Maximum Output Current | 5 mA |
| Quiescent Current (Disabled) | 1.0 pA |
| Package Size | 5‑pin micro SMD, 0.828 mm × 1.387 mm |
The regulator is enabled by applying a high voltage to the ENABLE pin and disabled by pulling the pin low.
The maximum power dissipation is approximately 392 mW for the micro‑SMD package at 25 °C ambient.
Yes, the device remains stable and in regulation with no external load.