LP3874ET-1.8/NOPB National Semiconductor, LP3874ET-1.8/NOPB Datasheet

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LP3874ET-1.8/NOPB

Manufacturer Part Number
LP3874ET-1.8/NOPB
Description
IC REG LDO 0.8A 1.8V TO220-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3874ET-1.8/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.8V
Voltage - Input
2.5 ~ 7 V
Number Of Regulators
1
Current - Output
800mA (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
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Other names
*LP3874ET-1.8
*LP3874ET-1.8/NOPB
LP3874ET-1.8
© 2006 National Semiconductor Corporation
LP3871/LP3874
0.8A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3871/LP3874 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 LP3871/LP3874
are developed on a CMOS process which allows low quies-
cent current operation independent of output load current.
This CMOS process also allows the LP3871/LP3874 to op-
erate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 24mV
at 80mA load current and 240mV at 0.8A load current.
Ground Pin Current: Typically 6mA at 0.8A load current.
Shutdown Mode: Typically 10nA 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
DS200631
±
3.0% over all
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.04%
n 10nA quiescent current in shutdown mode
n Guaranteed output current of 0.8A DC
n Available in TO-263, TO-220 and SOT-223 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%
September 2006
20063101
www.national.com

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LP3874ET-1.8/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 ...

Page 2

Typical Application Circuits *SD 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 20063190 Top View SOT223-5 Package www.national.com (Continued) 20063105 TO263-5 Package 2 20063145 ...

Page 3

Pin Descriptions for TO220-5 and TO263-5 Packages Pin # Name GND 4 V OUT 5 ERROR Pin Descriptions for SOT223-5 Package Pin # Name OUT 4 ERROR ...

Page 4

... Rail LP3874ES-1.8 Tape and Reel LP3871ET-5.0 Rail LP3871ET-3.3 Rail LP3871ET-2.5 Rail LP3871ET-1.8 Rail LP3874ET-5.0 Rail LP3874ET-3.3 Rail LP3874ET-2.5 Rail LP3874ET-1.8 Rail LH9B 1000 Units on Tape and Reel LH9B 2000 Units on Tape and Reel LH8B 1000 Units on Tape and Reel LH8B 2000 Units on Tape and Reel ...

Page 5

Ordering Information (Continued) TABLE 1. Package Marking and Ordering Information (Continued) Output Order Number Voltage (Current, Option) 5.0 LP3874EMP-5.0 0.8A, SENSE 5.0 LP3874EMPX-5.0 0.8A, SENSE 3.3 LP3874EMP-3.3 0.8A, SENSE 3.3 LP3874EMPX-3.3 0.8A, SENSE 2.5 LP3874EMP-2.5 0.8A, SENSE 2.5 LP3874EMPX-2.5 0.8A, ...

Page 6

Block Diagrams www.national.com LP3871 20063103 LP3874 20063129 6 ...

Page 7

... 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 8

Electrical Characteristics LP3871/LP3874 (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 9

Typical Performance Characteristics C = 10µF, S/D pin is tied OUT Dropout Voltage vs Output Load Current Shutdown I vs Junction Temperature Q DC Load Reg. vs Junction Temperature Unless ohterwise specified ...

Page 10

Typical Performance Characteristics C = 10µF, S/D pin is tied Noise vs Frequency Load Transient Response 100µF, OSCON IN OUT Load Transient Response 10µF, TANTALUM IN OUT www.national.com ...

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 10µF is required. Ceramic, Tantalum, or Electrolytic ...

Page 12

Application Hints (Continued) input, output, and ground pins of the regulator using traces which do not have other currents flowing in them (Kelvin connect). The best way to do this is to lay out C device with short traces to ...

Page 13

Application Hints (Continued) SENSE PIN In applications where the regulator output is not very close to the load, LP3874 can provide better remote load regulation using the SENSE pin. Figure 2 depicts the advantage of the SENSE option. LP3871 regulates ...

Page 14

Application Hints (Continued) DROPOUT VOLTAGE The dropout voltage of a regulator is defined as the minimum input-to-output differential required to stay within 2% of the nominal output voltage. For CMOS LDOs, the dropout volt- age is the product of the ...

Page 15

Application Hints (Continued) FIGURE 5. θ vs Copper(1 Ounce) Area for SOT-223 JA package The following figures show different layout scenarios for SOT-223 package. FIGURE 6. SCENARIO A, θ 20063191 FIGURE 7. SCENARIO B, θ 15 20063192 = 148˚C/W JA ...

Page 16

Physical Dimensions TO220 5-lead, Molded, Stagger Bend Package (TO220-5) For Order Numbers, refer to the “Ordering Information” section of this document. www.national.com inches (millimeters) unless otherwise noted NS Package Number T05D 16 ...

Page 17

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) TO263 5-Lead, Molded, Surface Mount Package (TO263-5) For Order Numbers, refer to the “Ordering Information” section of this document. NS Package Number TS5B 17 www.national.com ...

Page 18

... 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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