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PDF LP3881ES-1.8 Data sheet ( Hoja de datos )
| Número de pieza | LP3881ES-1.8 | |
| Descripción | 0.8A Fast-Response Ultra Low Dropout Linear | |
| Fabricantes | National Semiconductor | |
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August 2003
LP3881
0.8A Fast-Response Ultra Low Dropout Linear
Regulators
General Description
The LP3881 is a high current, fast response regulator which
can maintain output voltage regulation with minimum input to
output voltage drop. Fabricated on a CMOS process, the
device operates from two input voltages: Vbias provides
voltage to drive the gate of the N-MOS power transistor,
while Vin is the input voltage which supplies power to the
load. The use of an external bias rail allows the part to
operate from ultra low Vin voltages. Unlike bipolar regula-
tors, the CMOS architecture consumes extremely low quies-
cent current at any output load current. The use of an
N-MOS power transistor results in wide bandwidth, yet mini-
mum external capacitance is required to maintain loop sta-
bility.
The fast transient response of these devices makes them
suitable for use in powering DSP, Microcontroller Core volt-
ages and Switch Mode Power Supply post regulators. The
parts are available in TO-220 and TO-263 packages.
Dropout Voltage: 75 mV (typ) @ 0.8A load current.
Ground Pin Current: 3 mA (typ) at full load.
Shutdown Current: 60 nA (typ) when S/D pin is low.
Precision Output Voltage: 1.5% room temperature accu-
racy.
Features
n Ultra low dropout voltage (75 mV @ 0.8A typ)
n Low ground pin current
n Load regulation of 0.04%/A
n 60 nA typical quiescent current in shutdown
n 1.5% output accuracy (25˚C)
n TO-220, TO-263 packages
n Over temperature/over current protection
n −40˚C to +125˚C junction temperature range
Applications
n DSP Power Supplies
n Server Core and I/O Supplies
n PC Add-in-Cards
n Local Regulators in Set-Top Boxes
n Microcontroller Power Supplies
n High Efficiency Power Supplies
n SMPS Post-Regulators
Typical Application Circuit
At least 4.7 µF of input and output capacitance is required for stability.
Connection Diagrams
TO-220, Top View
20063002
© 2003 National Semiconductor Corporation DS200630
20063001
20063003
TO-263, Top View
www.national.com
1 page  
Typical Performance Characteristics
Unless otherwise specified: TA = 25˚C, COUT = 4.7µF, Cin
= 4.7µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V
Dropout vs IL
IGND vs VSD
VOUT vs Temperature
20063004
DC Load Regulation
20063005
Line Regulation vs VIN
20063006
Line Regulation vs VBIAS
20063007
20063008
5
20063009
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
TO220 5-lead, Molded, Stagger Bend Package (TO220-5)
NS Package Number T05D
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LP3881ES-1.8.PDF ] | |
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