LP38842T-1.5/NOPB National Semiconductor, LP38842T-1.5/NOPB Datasheet

IC REG LDO 1.5A 1.5V TO220-5

LP38842T-1.5/NOPB

Manufacturer Part Number
LP38842T-1.5/NOPB
Description
IC REG LDO 1.5A 1.5V TO220-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP38842T-1.5/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.5V
Voltage - Input
Up to 5.5V
Voltage - Dropout (typical)
0.115V @ 1.5A
Number Of Regulators
1
Current - Output
1.5A
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Straight Leads)
For Use With
LP38842EVAL - BOARD EVALUATION LP38842
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
*LP38842T-1.5
*LP38842T-1.5/NOPB
LP38842T-1.5
© 2006 National Semiconductor Corporation
LP38842
1.5A Ultra Low Dropout Linear Regulators
Stable with Ceramic Output Capacitors
General Description
The LP38842 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: 115 mV (typ)
Quiescent Current: 30 mA (typ) at full load.
Shutdown Current: 30 nA (typ) when S/D pin is low.
Precision Output Voltage: 1.5% room temperature accu-
racy.
Typical Application Circuit
* Minimum value required if Tantalum capacitor is used (see Application Hints).
@
1.5A load current.
DS201030
Features
n Ideal for conversion from 1.8V or 1.5V inputs
n Designed for use with low ESR ceramic capacitors
n 0.8V, 1.2V and 1.5V standard voltages available
n Ultra low dropout voltage (115mV
n 1.5% initial output accuracy
n Load regulation of 0.1%/A (typical)
n 30nA quiescent current in shutdown (typical)
n Low ground pin current at all loads
n Over temperature/over current protection
n Available in 5 lead TO220 and TO263 packages
n −40˚C to +125˚C junction temperature range
Applications
n ASIC Power Supplies In:
n Server Core and I/O Supplies
n DSP and FPGA Power Supplies
n SMPS Post-Regulator
- Desktops, Notebooks, and Graphics Cards, Servers
- Gaming Set Top Boxes, Printers and Copiers
20103001
@
1.5A typ)
September 2006
www.national.com

Related parts for LP38842T-1.5/NOPB

LP38842T-1.5/NOPB Summary of contents

Page 1

... Precision Output Voltage: 1.5% room temperature accu- racy. Typical Application Circuit * Minimum value required if Tantalum capacitor is used (see Application Hints). © 2006 National Semiconductor Corporation Features n Ideal for conversion from 1.8V or 1.5V inputs n Designed for use with low ESR ceramic capacitors n 0 ...

Page 2

... This provides a low power shutdown function which turns the regulated output OFF. Tie to V this function is not used. Ordering Information Order Number LP38842S-0.8 LP38842SX-0.8 LP38842T-0.8 LP38842T-0.8 LB03 LP38842S-1.2 LP38842SX-1.2 LP38842T-1.2 LP38842T-1.2 LB03 LP38842S-1.5 LP38842SX-1.5 LP38842T-1.5 LP38842T-1.5 LB03 www.national.com 20103002 Description Package Type Package Drawing TO263-5 ...

Page 3

Block Diagram 20103024 3 www.national.com ...

Page 4

... 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 9) Power Dissipation (Note 2) V Supply Voltage (Survival) ...

Page 5

Electrical Characteristics over the full operating temperature range. Unless otherwise specified µF CER µF CER, C OUT BIAS correlation, or design. (Continued) Symbol Parameter AC Parameters PSRR (V ) Ripple Rejection for ...

Page 6

Typical Performance Characteristics µF CER µF CER, S/D Pin is tied to V OUT BIAS V Transient Response BIAS Load Transient Response V vs Temperature OUT www.national.com Unless otherwise specified ...

Page 7

Typical Performance Characteristics = 22 µF CER µF CER, S/D Pin is tied to V BIAS 1V. (Continued) V PSRR BIAS Output Noise Voltage Unless otherwise specified 1.2V 10mA, V BIAS ...

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 An output capacitor is required on the LP3884X devices for loop stability. The minimum value of capacitance ...

Page 9

Application Hints (Continued) FIGURE 1. θ vs Copper (1 Ounce) Area for TO-263 JA package 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 ...

Page 10

Physical Dimensions TO220 5-lead, Molded, Stagger Bend Package (TO220-5) TO220 5-lead, Molded, Straight Lead Package (TO220-5) www.national.com inches (millimeters) unless otherwise noted NS Package Number T05D NS Package Number T05A 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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