LP3878 Datasheet, PDF (1/11 Pages) National Semiconductor (TI) – Micropower 800mA Low Noise Ceramic Stable Voltage Regulator for Low Voltage Applications Designed for Use with Very Low ESR Output Capacitors

November 2004
LP3878
Micropower 800mA Low Noise "Ceramic Stable" Voltage
Regulator for Low Voltage Applications
Designed for Use with Very Low ESR Output Capacitors
General Description
The LP3878 is a 800 mA fixed-output voltage regulator
designed to provide high performance and low noise in
applications requiring output voltages between 1.0V and
1.2V.
Output noise can be reduced to 18µV (typical) by connecting
an external 10 nF capacitor to the bypass pin.
Using an optimized VIP™ (Vertically Integrated PNP) pro-
cess, the LP3878 delivers superior performance:
Ground Pin Current: Typically 5 mA @ 800 mA load, and
180 µA @ 100 µA load.
Sleep Mode: The LP3878 draws less than 2.0 µA quiescent
current when shutdown pin is pulled low.
Precision Output: Guaranteed output voltage accuracy is
1% at room temperature.
Features
n Standard output voltage: 1.00V
n Custom voltages available from 1.0V to 1.2V (50 mV
increments)
n Input voltage: 2.2 to 6.0V
n 1% initial output accuracy
n Guaranteed 800 mA continuous output current
n Designed for use with low ESR ceramic capacitors
n Very low output noise with external capacitor
n Sense option improves load regulation
n 8 Lead LLP surface mount package
n <2.0 µA quiescent current in shutdown
n Low ground pin current at all loads
n High peak current capability (1200 mA typical)
n Overtemperature/overcurrent protection
n 0˚C to +125˚C junction temperature range
Applications
n ASIC Power Supplies In:
- Desktops, Notebooks and Graphic Cards
- Set Top Boxes, Printers and Copiers
n DSP and FPGA Power Supplies
n SMPS Post-Regulator
Basic Application Circuit
20086803
*Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger output capacitor provides improved dynamic
response. Output capacitor must meet ESR requirements (see Application Hints).
**Shutdown must be actively terminated (see App. Hints). Tie to INPUT (Pin4) if not used.
VIP™ is a trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200868
www.national.com