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LP3878-ADJ Datasheet

Micropower 800mA Low Noise(Ceramic Stable) Adjustable Voltage Regulator

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May 2005
LP3878-ADJ
Micropower 800mA Low Noise "Ceramic Stable"
Adjustable Voltage Regulator for 1V to 5V Applications
General Description
The LP3878-ADJ is an 800 mA adjustable output voltage
regulator designed to provide high performance and low
noise in applications requiring output voltages as low as
1.0V.
Using an optimized VIP(Vertically Integrated PNP) pro-
cess, the LP3878-ADJ delivers superior performance:
Ground Pin Current: Typically 5.5 mA @ 800 mA load, and
www.DataS1h8e0eµt4AU@.co1m00 µA load.
Low Power Shutdown: The LP3878-ADJ 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 1.0V to 5.5V output
n Designed for use with low ESR ceramic capacitors
n Very low output noise
n 8 Lead PSOP and LLP surface mount package
n <10 µA quiescent current in shutdown
n Low ground pin current at all loads
n Over-temperature/over-current protection
n -40˚C to +125˚C operating 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
20120903
*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.
© 2005 National Semiconductor Corporation DS201209
www.national.com


National Semiconductor Electronic Components Datasheet

LP3878-ADJ Datasheet

Micropower 800mA Low Noise(Ceramic Stable) Adjustable Voltage Regulator

No Preview Available !

Connection Diagrams
8 Lead PSOP Package (MRA)
8 Lead LLP Surface Mount Package (SD)
20120930
Top View
See NS Package Number MRA08A
20120950
Top View
See NS Package Number SDC08A
Ordering Information
www.DataSheet4U.com
Output Voltage
ADJ
ADJ
ADJ
ADJ
TABLE 1. Package Marking and Ordering Information
Grade
STD
STD
STD
STD
Order Information
LP3878MR-ADJ
LP3878MRX-ADJ
LP3878SD-ADJ
LP3878SDX-ADJ
Supplied as:
95 Units per Rail
2500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
Pin Description
PIN
1
2
3
4
5
6
7
8
PSOP, LLP
DAP
NAME
BYPASS
N/C
GROUND
INPUT
OUTPUT
ADJ
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.
Provides feedback to error amplifier from the resistive divider that sets
the output voltage.
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 LP3878-ADJ
Description Micropower 800mA Low Noise(Ceramic Stable) Adjustable Voltage Regulator
Maker National Semiconductor
Total Page 13 Pages
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2 LP3878-ADJ Micropower 800mA Low Noise(Ceramic Stable) Adjustable Voltage Regulator
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