LP3875ET-ADJ/NOPB National Semiconductor, LP3875ET-ADJ/NOPB Datasheet

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LP3875ET-ADJ/NOPB

Manufacturer Part Number
LP3875ET-ADJ/NOPB
Description
IC REG LDO 1.5A ADJ VOLT TO220-5
Manufacturer
National Semiconductor
Datasheet

Specifications of LP3875ET-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
Adjustable
Voltage - Input
2.5 ~ 7 V
Voltage - Dropout (typical)
0.38V @ 1.5A
Number Of Regulators
1
Current - Output
1.5A (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
*LP3875ET-ADJ
*LP3875ET-ADJ/NOPB
LP3875ET-ADJ
© 2006 National Semiconductor Corporation
LP3875-ADJ
1.5A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3875-ADJ fast ultra low-dropout linear regulators op-
erate from a +2.5V to +7.0V input supply. These ultra low
dropout linear regulators respond very quickly to step
changes in load, which makes them suitable for low voltage
microprocessor applications. The LP3875-ADJ is developed
on a CMOS process which allows low quiescent current
operation independent of output load current. This CMOS
process also allows the LP3875-ADJ to operate under ex-
tremely 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.
Adjustable Output Voltage: The output voltage may be
programmed via two external resistors.
Typical Application Circuit
*See Application Hints
DS200746
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 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
September 2006
20074645
www.national.com

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LP3875ET-ADJ/NOPB Summary of contents

Page 1

... Adjustable Output Voltage: The output voltage may be programmed via two external resistors. Typical Application Circuit *See Application Hints © 2006 National Semiconductor Corporation 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 ...

Page 2

Connection Diagrams Top View TO220-5 Package Bent, Staggered Leads 20074681 Top View SOT223-5 Package Pin Description for TO220-5 and TO263-5 Packages Pin # Pin Description for SOT223-5 Package Pin # ...

Page 3

... Option) 1.5A, Adj SOT223-5 1.5A, Adj SOT223-5 1.5A, Adj TO263-5 1.5A, Adj TO263-5 1.5A, Adj TO220-5 3 20074631 Package Marking Supplied As: LHSB 1000 Units on Tape and Reel LHSB 2000 Units on Tape and Reel LP3875ES-ADJ Rail LP3875ES-ADJ Tape and Reel LP3875ET-ADJ Rail www.national.com ...

Page 4

Block Diagram www.national.com LP3875-ADJ 4 20074629 ...

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 LP3875-ADJ (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 AC ...

Page 7

Typical Performance Characteristics C = 10µF, S/D pin is tied OUT Dropout Voltage vs Output Load Current Shutdown I vs Junction Temperature Q DC Line Regulation vs Temperature Unless otherwise specified 2.5V, ...

Page 8

Typical Performance Characteristics C = 10µF, S/D pin is tied Load Transient Response 10µF, OSCON IN OUT Load Transient Response 100µF, POSCAP IN OUT Load Transient ...

Page 9

Application Hints SETTING THE OUTPUT VOLTAGE The output voltage is set using the resistors R1 and R2 (see Typical Application Circuit). The output is also dependent on the reference voltage (typically 1.216V) which is measured at the ADJ pin. The ...

Page 10

Application Hints (Continued) a severe temperature effect, losing more than 50% of nomi- nal capacitance at high and low limits of the temperature range. X7R and X5R dielectric ceramic capacitors are strongly rec- ommended if ceramics are used, as they ...

Page 11

Application Hints (Continued) the current drawn by the internal reference increases the total supply current (ground pin current). Using an optimized trade-off of ground pin current and die size, LP3875-ADJ achieves low noise performance and low quiescent current operation. The ...

Page 12

Application Hints (Continued) FIGURE 2. Maximum power dissipation vs ambient temperature for TO-263 package HEATSINKING SOT223-5 PACKAGE Figure 3 shows a curve for the θ of SOT-223 package for JA different copper area sizes, using a typical PCB with 1 ...

Page 13

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. NS Package Number T05D 13 www.national.com ...

Page 14

Physical Dimensions TO263 5-Lead, Molded, Surface Mount Package (TO263-5) For Order Numbers, refer to the “Ordering Information” section of this document. www.national.com inches (millimeters) unless otherwise noted (Continued) NS Package Number TS5B 14 ...

Page 15

... 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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