LP3876ET-2.5/NOPB National Semiconductor, LP3876ET-2.5/NOPB Datasheet

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LP3876ET-2.5/NOPB

Manufacturer Part Number
LP3876ET-2.5/NOPB
Description
IC REG LDO 3A 2.5V TO220-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3876ET-2.5/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
2.5V
Voltage - Input
Up to 7V
Voltage - Dropout (typical)
0.8V @ 3A
Number Of Regulators
1
Current - Output
3A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-220-5 (Bent and Staggered Leads)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
*LP3876ET-2.5
*LP3876ET-2.5/NOPB
LP3876ET-2.5
© 2006 National Semiconductor Corporation
LP3873/LP3876
3A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3873/LP3876 series of fast ultra low-dropout linear
regulators operate from a +2.5V to +7.0V input supply. Wide
range of preset output voltage options are available. These
ultra low dropout linear regulators respond very quickly to
step changes in load, which makes them suitable for low
voltage microprocessor applications. The LP3873/LP3876
are developed on a CMOS process which allows low quies-
cent current operation independent of output load current.
This CMOS process also allows the LP3873/LP3876 to op-
erate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 80mV
at 300mA load current and 800mV at 3A load current.
Ground Pin Current: Typically 6mA at 3A load current.
Shutdown Mode: Typically 1µA quiescent current when the
shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage
drops 10% below nominal value.
SENSE: Sense pin improves regulation at remote loads.
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.8V to 5.0V with a guaranteed
accuracy of
conditions (varying line, load, and temperature).
Typical Application Circuits
*SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See application hints
for more information.
±
1.5% at room temperature, and
DS200605
±
3.0% over all
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.08%
n 1µA quiescent current in shutdown mode
n Guaranteed output current of 3A DC
n Available in TO-263 and TO-220 packages
n Output voltage accuracy
n Error flag indicates output status
n Sense option improves load regulation
n Minimum output capacitor requirements
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Microprocessor power supplies
n GTL, GTL+, BTL, and SSTL bus terminators
n Power supplies for DSPs
n SCSI terminator
n Post regulators
n High efficiency linear regulators
n Battery chargers
n Other battery powered applications
±
1.5%
20060501
September 2006
www.national.com

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LP3876ET-2.5/NOPB Summary of contents

Page 1

... Typical Application Circuits *SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See application hints for more information. © 2006 National Semiconductor Corporation Features n Ultra low dropout voltage n Low ground pin current n Load regulation of 0.08% n 1µ ...

Page 2

Typical Application Circuits *SD pins must be pulled high through a 10kΩ pull-up resistor. See application hints for more information. Connection Diagrams Top View TO220-5 Package Bent, Staggered Leads Pin Descriptions for TO220-5 and TO263-5 Packages Pin # Name 1 ...

Page 3

... LP3876ES-5.0 Rail LP3876ES-5.0 Tape and Reel LP3876ES-3.3 Rail LP3876ES-3.3 Tape and Reel LP3876ES-2.5 Rail LP3876ES-2.5 Tape and Reel LP3876ES-1.8 Rail LP3876ES-1.8 Tape and Reel LP3873ET-5.0 Rail LP3873ET-3.3 Rail LP3873ET-2.5 Rail LP3873ET-1.8 Rail LP3876ET-5.0 Rail LP3876ET-3.3 Rail LP3876ET-2.5 Rail LP3876ET-1.8 Rail www.national.com ...

Page 4

Block Diagram LP3873 Block Diagram LP3876 www.national.com 20060503 20060529 4 ...

Page 5

... 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 Temperature (Soldering, 5 sec.) ESD Rating (Note 3) Power Dissipation (Note 2) Input Supply Voltage (Survival) Shutdown Input Voltage (Survival) ...

Page 6

Electrical Characteristics LP3873/LP3876 (Continued) Limits in standard typeface are for T Unless otherwise specified Symbol Parameter SHUTDOWN INPUT V Shutdown Threshold SDT T Turn-off delay dOFF T Turn-on delay dON I SD Input Current SD ERROR ...

Page 7

Typical Performance Characteristics C = 10µF, S/D pin is tied OUT Dropout Voltage Vs Output Load Current Ground Current vs Output Voltage Error Flag Threshold vs Junction Temperature Unless otherwise ...

Page 8

Typical Performance Characteristics C = 10µF, S/D pin is tied Line Regulation vs Temperature Noise vs Frequency Load Transient Response 100µF, OSCON IN OUT www.national.com Unless otherwise specified: T ...

Page 9

Typical Performance Characteristics C = 10µF, S/D pin is tied OUT Load Transient Response 10µF, TANTALUM IN OUT Load Transient Response 10µF, OSCON IN OUT Load ...

Page 10

Typical Performance Characteristics C = 10µF, S/D pin is tied Load Transient Response 100µF, TANTALUM IN OUT www.national.com Unless otherwise specified 2.5V 1V, I ...

Page 11

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are re- quired to assure stability. these capacitors must be correctly selected for proper performance. INPUT CAPACITOR: An input capacitor of at least 1µF is required. Ceramic or Tantalum may ...

Page 12

Application Hints (Continued) PCB LAYOUT Good PC layout practices must be used or instability can be induced because of ground loops and voltage drops. The input and output capacitors must be directly connected to the input, output, and ground pins ...

Page 13

Application Hints (Continued) SENSE PIN In applications where the regulator output is not very close to the load, LP3876 can provide better remote load regulation using the SENSE pin. Figure 2 depicts the advantage of the SENSE option. LP3873 regulates ...

Page 14

Application Hints (Continued) SHUTDOWN OPERATION A CMOS Logic level signal at the shutdown ( SD) pin will turn-off the regulator. Pin SD must be actively terminated through a 10kΩ pull-up resistor for a proper operation. If this pin is driven ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted TO220 5-lead, Molded, Stagger Bend Package (TO220-5) For Order Numbers, refer to the “Ordering Information” section of this document. TO263 5-Lead, Molded, Surface Mount Package (TO263-5) For Order Numbers, refer to the “Ordering ...

Page 16

... 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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