LP3881ESX-1.2/NOPB National Semiconductor, LP3881ESX-1.2/NOPB Datasheet

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

LP3881ESX-1.2/NOPB

Manufacturer Part Number
LP3881ESX-1.2/NOPB
Description
IC REG LDO 0.8A 1.2V TO-263-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3881ESX-1.2/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.2V
Voltage - Input
Up to 5.5V
Voltage - Dropout (typical)
0.075V @ 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
LP3881ESX-1.2
© 2006 National Semiconductor Corporation
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, TO-263 and PSOP-8 pack-
ages.
Dropout Voltage: 75 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 4.7 µF of input and output capacitance is required for stability.
@
0.8A load current.
DS200630
Features
n Ultra low dropout voltage (75 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 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
20063001
@
0.8A typ)
www.national.com
June 2006

Related parts for LP3881ESX-1.2/NOPB

LP3881ESX-1.2/NOPB Summary of contents

Page 1

... Shutdown Current (typ) when S/D pin is low. Precision Output Voltage: 1.5% room temperature accu- racy. Typical Application Circuit At least 4.7 µF of input and output capacitance is required for stability. © 2006 National Semiconductor Corporation Features n Ultra low dropout voltage ( Low ground pin current n Load regulation of 0.04%/ typical quiescent current in shutdown n 1.5% output accuracy (25˚ ...

Page 2

... Connection Diagrams TO-220, Top View Ordering Information Order Number Package Type LP3881ES-1.2 LP3881ESX-1.2 LP3881ET-1.2 LP3881ES-1.5 LP3881ESX-1.5 LP3881ET-1.5 LP3881ES-1.8 LP3881ESX-1.8 LP3881ET-1.8 LP3881EMR-1.2 LP3881EMRX-1.2 LP3881EMR-1.5 LP3881EMRX-1.5 LP3881EMR-1.8 LP3881EMRX-1.8 Block Diagram www.national.com 20063002 20063053 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 4.7 µ (Continued) OUT S/D BIAS Symbol Parameter AC Parameters PSRR (V ) Ripple Rejection for Voltage PSRR Ripple ...

Page 5

Typical Performance Characteristics 4.7µF, S/D pin is tied 2.2V, V BIAS IN Dropout Temperature OUT Line Regulation vs V Unless otherwise specified 1.8V OUT 20063004 20063006 IN 20063008 ...

Page 6

Typical Performance Characteristics 4.7µF, S/D pin is tied 2.2V, V BIAS BIAS L Noise Measurement Line Regulation vs V www.national.com Unless otherwise specified 1.8V (Continued) OUT 20063010 20063014 BIAS ...

Page 7

Typical Performance Characteristics 4.7µF, S/D pin is tied 2.2V, V BIAS IN V PSRR IN V PSRR BIAS Unless otherwise specified 1.8V (Continued) OUT 20063020 20063022 7 = 25˚ 4.7µF, Cin ...

Page 8

... PNP or P-FET LDO regulator can cause a loss of phase margin which can result in oscillations, even when a Tantalum output capacitor is in parallel with it. This is not unique to National Semiconductor LDO regulators true of any P-type LDO regulator. www.national.com The reason for this is that PNP or P-FET regulators have a ...

Page 9

Application Hints (Continued) POWER DISSIPATION/HEATSINKING A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Under all possible conditions, the junction tem- perature must be within the range specified under operating conditions. ...

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) TO263 5-Lead, Molded, Surface Mount Package (TO263-5) NS Package Number T05D NS Package Number TS5B 11 www.national.com ...

Page 12

... 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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