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PDF LP3893 Data sheet ( Hoja de datos )
| Número de pieza | LP3893 | |
| Descripción | 3A Fast-Response Ultra Low Dropout Linear Regulators | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LP3893 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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September 2003
LP3893
3A Fast-Response Ultra Low Dropout Linear Regulators
General Description
The LP3893 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: 270 mV (typ) @ 3A 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 (270 mV @ 3A 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 Linear Power Supplies for PC Add-in-Cards
n Set-Top Box Power Supplies
n Microprocessor Power Supplies
n High Efficiency Linear Power Supplies
n SMPS Post-Regulators
Typical Application Circuit
20069701
At least 10 µF of input and output capacitance is required for stability.
*Tantalum capacitors are recommended. Aluminum electrolytic capacitors may be used for restricted temperature range. See application hints.
Connection Diagrams
TO-220, Top View
20069702
© 2003 National Semiconductor Corporation DS200697
TO-263, Top View
20069703
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified: Tj = 25˚C, COUT = 10 µF, Cin = 10
µF, S/D pin is tied to VBIAS, VIN = 2.2V, VOUT = 1.8V.
IGND vs VSD
VOUT vs Temperature
DC Load Regulation
20069705
Line Regulation vs VIN
20069706
Line Regulation vs VBIAS
20069707
IBIAS vs IL
20069708
20069709
5
20069710
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 LP3893.PDF ] | |
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