LP3891ES-1.2/NOPB National Semiconductor, LP3891ES-1.2/NOPB Datasheet

IC REG LDO 0.8A 1.2V TO-263-5

LP3891ES-1.2/NOPB

Manufacturer Part Number
LP3891ES-1.2/NOPB
Description
IC REG LDO 0.8A 1.2V TO-263-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3891ES-1.2/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.2V
Voltage - Input
Up to 5.5V
Voltage - Dropout (typical)
0.1V @ 800mA
Number Of Regulators
1
Current - Output
800mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-5, D²Pak (5 leads + Tab), TO-263BA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
*LP3891ES-1.2
*LP3891ES-1.2/NOPB
LP3891ES-1.2
© 2006 National Semiconductor Corporation
LP3891
0.8A Fast-Response Ultra Low Dropout Linear
Regulators
General Description
The LP3891 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, TO-263 and PSOP-8 pack-
ages.
Dropout Voltage: 100 mV (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.
@
0.8A load current.
DS200695
Features
n Ultra low dropout voltage (100mV
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 and PSOP-8 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
20069501
@
0.8A typ)
www.national.com
June 2006

Related parts for LP3891ES-1.2/NOPB

LP3891ES-1.2/NOPB Summary of contents

Page 1

... 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. © 2006 National Semiconductor Corporation Features n Ultra low dropout voltage (100mV n Low ground pin current n Load regulation of 0 ...

Page 2

... Connection Diagrams TO-220, Top View Ordering Information Order Number Package Type LP3891ES-1.2 LP3891ESX-1.2 LP3891ET-1.2 LP3891ES-1.5 LP3891ESX-1.5 LP3891ET-1.5 LP3891ES-1.8 LP3891ESX-1.8 LP3891ET-1.8 LP3891EMR-1.2 LP3891EMRX-1.2 LP3891EMR-1.5 LP3891EMRX-1.5 LP3891EMR-1.8 LP3891EMRX-1.8 Block Diagram www.national.com 20069502 20069553 PSOP-8, Top View Package Drawing TO263-5 TS5B TO263-5 TS5B TO220-5 ...

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 µ (Continued) OUT S/D BIAS Symbol Parameter AC Parameters PSRR (V ) Ripple Rejection for V IN Voltage PSRR Ripple Rejection ...

Page 5

Typical Performance Characteristics 10µF, S/D pin is tied 2.2V, V BIAS VSD GND DC Load Regulation Line Regulation vs V Unless otherwise specified 1.8V OUT 20069505 20069507 BIAS 20069509 5 ...

Page 6

Typical Performance Characteristics 10µF, 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 20069512 20069515 ...

Page 7

Typical Performance Characteristics 10µF, S/D pin is tied 2.2V, V BIAS IN V PSRR IN Unless otherwise specified 1.8V (Continued) OUT 20069523 7 = 25˚ µF, Cin = J OUT ...

Page 8

Application Hints EXTERNAL CAPACITORS To assure regulator stability, input and output capacitors are required as shown in the Typical Application Circuit. OUTPUT CAPACITOR At least 10µF of output capacitance is required for stability (the amount of capacitance can be increased ...

Page 9

Application Hints (Continued) HEATSINKING TO-263 PACKAGE The TO-263 package uses the copper plane on the PCB as a heatsink. The tab of these packages are soldered to the copper plane for heat sinking. The graph below shows a curve for ...

Page 10

Physical Dimensions TO220 5-lead, Molded, Stagger Bend Package (TO220-5) TO263 5-Lead, Molded, Surface Mount Package (TO263-5) www.national.com inches (millimeters) unless otherwise noted NS Package Number T05D NS Package Number TS5B 10 ...

Page 11

... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...

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