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LP3879 Datasheet

Micropower 800mA Low Noise Ceramic Stable Voltage Regulator

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June 2006
LP3879
Micropower 800mA Low Noise "Ceramic Stable" Voltage
Regulator for Low Voltage Applications
General Description
The LP3879 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.
Using an optimized VIP(Vertically Integrated PNP) pro-
cess, the LP3879 delivers superior performance:
Ground Pin Current: Typically 5.5 mA @ 800 mA load, and
www.DataS2h0e0eµt4AU@.co1m00 µA load.
Low Power Shutdown: The LP3879 draws less than 10 µA
quiescent current when shutdown pin is pulled low.
Precision Output: Guaranteed output voltage accuracy is
1% at room temperature.
Low Noise: Broadband output noise is only 18 µV (typical)
with 10 nF bypass capacitor.
Features
n Standard output voltage: 1.00V, 1.20V
n Custom voltages available from 1.0V to 1.2V (50 mV
increments)
n Input voltage: 2.5 to 6V
n 1% initial output accuracy
n Designed for use with low ESR ceramic capacitors
n Very low output noise
n Sense option improves load regulation
n 8 Lead PSOP and LLP surface mount packages
n <10 µA quiescent current in shutdown
n Low ground pin current at all loads
n High peak current capability
n Over-temperature/over-current protection
n -40˚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
n Medical Instrumentation
Basic Application Circuit
20161303
*Capacitance values shown are minimum required to assure stability. Larger output capacitor provides improved dynamic response. Output capacitor must
meet ESR requirements (see Application Information).
**The Shutdown pin must be actively terminated (see Application Information). Tie to INPUT (Pin 4) if not used.
VIPis a trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201613
www.national.com


National Semiconductor Electronic Components Datasheet

LP3879 Datasheet

Micropower 800mA Low Noise Ceramic Stable Voltage Regulator

No Preview Available !

Connection Diagrams
8 Lead PSOP Package (MRA)
8 Lead LLP Surface Mount Package (SD)
20161330
Top View
See NS Package Number MRA08A
20161350
Top View
See NS Package Number SDC08A
Ordering Information
www.DataSheet4U.com
Output Voltage
1.00
1.00
1.00
1.00
1.20
1.20
1.20
1.20
TABLE 1. Package Marking and Ordering Information
Grade
STD
STD
STD
STD
STD
STD
STD
STD
Order Information
LP3879MR-1.0
LP3879MRX-1.0
LP3879SD-1.0
LP3879SDX-1.0
LP3879MR-1.2
LP3879MRX-1.2
LP3879SD-1.2
LP3879SDX-1.2
Supplied as:
95 Units per Rail
2500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
95 Units per Rail
2500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
Pin Descriptions
Pin
1
2
3
4
5
6
7
8
PSOP, LLP
DAP
Name
BYPASS
N/C
GROUND
INPUT
OUTPUT
SENSE
N/C
SHUTDOWN
SUBSTRATE
GROUND
Function
The capacitor connected between BYPASS and GROUND lowers
output noise voltage level and is required for loop stability.
DO NOT CONNECT. This pin is used for post package test and must
be left floating.
Device ground.
Input source voltage.
Regulated output voltage.
Remote Sense. Tie directly to output or remotely at point of load for
best regulation.
No internal connection.
Output is enabled above turn-on threshold voltage. Pull down to turn off
regulator output.
The exposed die attach pad should be connected to a thermal pad at
ground potential. For additional information on using National
Semiconductor’s Non Pull Back LLP package, please refer to LLP
application note AN-1187
www.national.com
2


Part Number LP3879
Description Micropower 800mA Low Noise Ceramic Stable Voltage Regulator
Maker National Semiconductor
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LP3879 Datasheet PDF






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