LP3892ES-1.2 National Semiconductor, LP3892ES-1.2 Datasheet

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LP3892ES-1.2

Manufacturer Part Number
LP3892ES-1.2
Description
1.5A Fast-Response Ultra Low Dropout Linear Regulators
Manufacturer
National Semiconductor
Datasheet

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© 2003 National Semiconductor Corporation
LP3892
1.5A Fast-Response Ultra Low Dropout Linear
Regulators
General Description
The LP3892 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 architectutre consumes extremely low qui-
escent 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:140mV (typ)
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.
Typical Application Circuit
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
@
1.5A load current.
DS200696
20069602
Features
n Ultra low dropout voltage (140 mV
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
TO-263, Top View
20069601
@
1.5A typ)
20069603
September 2003
www.national.com

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LP3892ES-1.2 Summary of contents

Page 1

... 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 © 2003 National Semiconductor Corporation Features n Ultra low dropout voltage (140 mV n Low ground pin current n Load regulation of 0 ...

Page 2

... Ordering Information Order Number LP3892ES-1.2 LP3892ESX-1.2 LP3892ET-1.2 LP3892ES-1.5 LP3892ESX-1.5 LP3892ET-1.5 LP3892ES-1.8 LP3892ESX-1.8 LP3892ET-1.8 Block Diagram www.national.com Package Type Package Drawing TO263-5 TS5B TO263-5 TS5B TO220-5 T05D TO263-5 TS5B TO263-5 TS5B TO220-5 T05D TO263-5 TS5B TO263-5 TS5B TO220-5 T05D 2 Supplied As Rail Tape and Reel ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Lead Temp. (Soldering, 5 seconds) ESD Rating Human Body Model (Note 3) Machine Model (Note 10) Power Dissipation (Note 2) V Supply Voltage (Survival) ...

Page 4

Electrical Characteristics over the full operating temperature range. Unless otherwise specified 10µ (Continued) OUT S/D BIAS Symbol Parameter AC Parameters PSRR (V ) Ripple Rejection for Voltage PSRR Ripple Rejection ...

Page 5

Typical Performance Characteristics 10 µF, S/D pin is tied 2.2V, V BIAS VSD GND DC Load Regulation Line Regulation vs V Unless otherwise specified 1.8V. OUT 20069605 20069607 BIAS 20069609 ...

Page 6

Typical Performance Characteristics µF, S/D pin is tied 2.2V, V BIAS VSD GND V Startup Waveform OUT Line Regulation vs V www.national.com Unless otherwise specified 1.8V. (Continued) OUT 20069612 20069615 ...

Page 7

Typical Performance Characteristics µF, S/D pin is tied 2.2V, V BIAS IN V PSRR IN V PSRR BIAS Unless otherwise specified 1.8V. (Continued) OUT 20069620 20069622 7 = 25˚ µF, ...

Page 8

Application Hints V RESTRICTIONS FOR PROPER START-UP BIAS To prevent misoperation, ensure that V before start-up is initiated. This scenario can occur in sys- tems with a backup battery using reverse-biased "blocking" diodes which may allow enough leakage current to ...

Page 9

Application Hints (Continued) HEATSINKING TO-220 PACKAGE The thermal resistance of a TO220 package can be reduced by attaching heat sink or a copper plane board copper plane used, the ...

Page 10

Application Hints (Continued) As shown in the graph below, increasing the copper area beyond 1 square inch produces very little improvement. The minimum value for θ for the TO-263 package mounted PCB is 32˚C/W. Figure 2 shows ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted TO220 5-lead, Molded, Stagger Bend Package (TO220-5) NS Package Number T05D 11 www.national.com ...

Page 12

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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