LP3872EMPX-1.8/NOPB National Semiconductor, LP3872EMPX-1.8/NOPB Datasheet

IC REG ULDO 1.5A 1.8V SOT223-5

LP3872EMPX-1.8/NOPB

Manufacturer Part Number
LP3872EMPX-1.8/NOPB
Description
IC REG ULDO 1.5A 1.8V SOT223-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3872EMPX-1.8/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.8V
Voltage - Input
2.5 ~ 7 V
Number Of Regulators
1
Current - Output
1.5A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-223 (4 leads + Tab)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Other names
LP3872EMPX-1.8
© 2006 National Semiconductor Corporation
LP3872/LP3875
1.5A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3872/LP3875 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 LP3872/LP3875
are developed on a CMOS process which allows low quies-
cent current operation independent of output load current.
This CMOS process also allows the LP3872/LP3875 to op-
erate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 38mV
at 150mA load current and 380mV at 1.5A load current.
Ground Pin Current: Typically 6mA at 1.5A 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
DS200633
±
3.0% over all
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.06%
n 10nA quiescent current in shutdown mode
n Guaranteed output current of 1.5A 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%
20063301
September 2006
www.national.com

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LP3872EMPX-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 20063386 Top View SOT223-5 Package www.national.com (Continued) 20063305 TO263-5 Package 2 20063345 ...

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

... LP3872ESX-2.5 1.5A, Error Flag 1.8 LP3872ES-1.8 1.5A, Error Flag 1.8 LP3872ESX-1.8 1.5A, Error Flag 1.8 LP3872EMP-1.8 1.5A, Error Flag 1.8 LP3872EMPX-1.8 1.5A, Error Flag 5.0 LP3875EMP-5.0 1.5A, SENSE 5.0 LP3875EMPX-5.0 1.5A, SENSE 5.0 LP3875ES-5.0 1.5A, SENSE 5.0 LP3875ESX-5.0 1.5A, SENSE 3 ...

Page 5

Ordering Information (Continued) TABLE 1. Package Marking and Ordering Information (Continued) Output Order Number Voltage (Current, Option) 3.3 LP3875EMPX-3.3 1.5A, SENSE 3.3 LP3875ES-3.3 1.5A, SENSE 3.3 LP3875ESX-3.3 1.5A, SENSE 2.5 LP3875EMP-2.5 1.5A, SENSE 2.5 LP3875EMPX-2.5 1.5A, SENSE 2.5 LP3875ES-2.5 1.5A, ...

Page 6

Block Diagrams www.national.com LP3872 20063303 LP3875 20063329 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 LP3872/LP3875 (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 otherwise 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 Ceramic, Tantalum, or ...

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, LP3875 can provide better remote load regulation using the SENSE pin. Figure 2 depicts the advantage of the SENSE option. LP3872 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 20063387 FIGURE 7. SCENARIO B, θ 15 20063388 = 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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