National Semiconductor LP2987 LP2988 Micropower, 200 mA Ultra Low-Dropout Voltage User Manual
Summary
Discover the LP2987/LP2988 series, ultra-low-dropout LDO voltage regulators engineered for reliable power management in portable and noise-sensitive equipment. Ideal for applications like cellular phones, digital cameras, laptops, and complex electronics requiring stable output voltages (e.g., 3.3V, 5.0V). This resource provides comprehensive guidance on configuring and integrating the regulator, covering key features such as programmable power-on reset delay, ultra-low quiescent current draw, and noise reduction capabilities.
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LP2987/LP2988 Micropower, m A Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988) General Description Features
The LP2987/8 are fixed-output m A precision LDO volt- Ultra low dropout voltage
age regulators with power-ON reset delay which can be Power-ON reset delay requires only one component implemented using single external capacitor. Bypass pin for reduced output noise (LP2988) The LP2988 is specifically designed for noise-critical appli- Guaranteed continuous output current m A cations. single external capacitor connected to the Bypass Guaranteed peak output current m A pin reduces regulator output noise.
SO-8 and mini SO-8 surface mount packages
Using an optimized VIP™ (Vertically Integrated PNP) pro- <2 µA quiescent current when shutdown cess, these regulators deliver superior performance: Low ground pin current at all loads Dropout Voltage: m V m A load, and m V m A 0.5% output voltage accuracy (“A” grade) load (typical). Wide supply voltage range (16V max) Ground Pin Current: m A m A load, and µA Overtemperature/overcurrent protection m A load (typical). −40˚C to +125˚C junction temperature range Sleep Mode: The LP2987/8 draws less than µA quiescent current when shutdown pin is held low. Applications Error Flag/Reset: The error flag goes low when the output
Cellular Phone
drops approximately 5% below nominal. This pin also pro-
Palmtop/Laptop Computer
vides power-ON reset signal if capacitor is connected to
Camcorder, Personal Stereo, Camera
the DELAY pin. Precision Output: Standard product versions of the LP2987 and LP2988 are available with output voltages of 5.0V, 3.8V, 3.3V, 3.2V, 3.0V, or 2.8V, with guaranteed accuracy of 0.5% (“A” grade) and 1% (standard grade) at room temperature.
Block Diagrams
DS100017-1
DS100017-2
VIP™ is trademark of National Semiconductor Corporation.
National Semiconductor Corporation DS100017 www.national.com
Page Summary Contents For National Semiconductor LP2987 LP2988 Micropower, 200 mA Ultra Low-Dropout Voltage User Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 19 |
| File Size | 517.39 KB |
| Published | June 06, 2026 |
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Frequently Asked Questions
How do I implement the power-on reset delay?
It only requires a single external capacitor connected to the DELAY pin.
Which model is best for noise-critical applications?
The LP2988, which features a Bypass pin for reduced output noise, is specifically designed for these uses.
What are the operating temperature and protection limits?
The regulators support a junction temperature range of −40°C to +125°C and include overtemperature/overcurrent protection.
What standard output voltages can I order?
Available options include 5.0V, 3.8V, 3.3V, 3.2V, 3.0V, or 2.8V.