NSC LP3964EMP-ADJ, LP3964EMP-5.0, LP3964EMP-3.3, LP3964EMP-1.8, LP3961ET-3.3 Datasheet
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May 2000
LP3961/LP3964
800mA Fast Ultra Low Dropout Linear Regulators
General Description
The LP3961/LP3964 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 fast to step changes in load which makes them suitable for low voltage microprocessor applications. The LP3961/LP3964 are developed on a CMOS process which allows low quiescent current operation independent of output load current. This CMOS process also allows the LP3961/LP3964 to operate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 24mV at 80mA load current and 240mV at 800mA load current.
Ground Pin Current: Typically 4mA at 800mA load current.
Shutdown Mode: Typically 15µA quiescent current when the shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage drops 10% below nominal value (for LP3961).
SENSE: Sense pin improves regulation at remote loads. (For LP3964)
Precision Output Voltage: Multiple output voltage options are available ranging from 1.2V to 5.0V and adjustable, with a guaranteed accuracy of ±1.5% at room temperature, and
±3.0% over all conditions ( varying line, load, and temperature).
Features
nUltra low dropout voltage
nLow ground pin current
nLoad regulation of 0.02%
n15µA quiescent current in shutdown mode
nGuaranteed output current of 0.8A DC
nAvailable in SOT-223,TO-263 and TO-220 packages
nOutput voltage accuracy ± 1.5%
nError flag indicates output status (LP3961)
nSense option improves better load regulation (LP3964)
nExtremely low output capacitor requirements
nOvertemperature/overcurrent protection
n−40ÊC to +125ÊC junction temperature range
Applications
nMicroprocessor power supplies
nGTL, GTL+, BTL, and SSTL bus terminators
nPower supplies for DSPs
nSCSI terminator
nPost regulators
nHigh efficiency linear regulators
nBattery chargers
nOther battery powered applications
Typical Application Circuits
DS101129-1
# Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin.
*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 applications section for more information.
Regulators Linear Dropout Low Ultra Fast 800mA LP3961/LP3964
© 2000 National Semiconductor Corporation |
DS101129 |
www.national.com |
LP3961/LP3964
Typical Application Circuits (Continued)
DS101129-2
# Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin.
*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 applications section for more information.
Block Diagram LP3961
DS101129-3
www.national.com |
2 |
Block Diagram LP3964
DS101129-29
Block Diagram LP3964-ADJ
DS101129-30
Connection Diagrams
DS101129-4
Top View
SOT 223-5 Package
LP3961/LP3964
3 |
www.national.com |
LP3961/LP3964
Connection Diagrams (Continued)
DS101129-5
Top View
TO220-5 Package
Bent, Staggered Leads
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DS101129-6 |
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Top View |
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TO263-5 Package |
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Pin Description for SOT223-5 Package |
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Pin # |
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LP3961 |
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LP3964 |
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Function |
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Function |
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1 |
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Shutdown |
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Shutdown |
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SD |
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SD |
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VIN |
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Input Supply |
VIN |
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Input Supply |
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3 |
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VOUT |
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Output Voltage |
VOUT |
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Output Voltage |
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Flag |
SENSE/ADJ |
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Remote Sense Pin |
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ERROR |
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ERROR |
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or output Adjust Pin |
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5 |
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GND |
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Ground |
GND |
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Ground |
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Pin Description for TO220-5 and TO263-5 Packages |
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Pin # |
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LP3961 |
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LP3964 |
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Function |
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Function |
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1 |
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Shutdown |
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Shutdown |
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SD |
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SD |
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VIN |
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Input Supply |
VIN |
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Input Supply |
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3 |
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GND |
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Ground |
GND |
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Ground |
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4 |
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VOUT |
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Output Voltage |
VOUT |
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Output Voltage |
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5 |
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SENSE/ADJ |
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Remote Sense Pin |
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ERROR |
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ERROR |
Flag |
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or output Adjust Pin |
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www.national.com |
4 |
Ordering Information
DS101129-31
Package Type Designator is ²MP² for SOT223 package, ²T² for TO220 package, and ²S² for TO263 package.
TABLE 1. Package Marking and Ordering Information
Output |
Order Number |
Description |
Package |
Package Marking |
Supplied As: |
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Voltage |
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(Current, Option) |
Type |
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5.0 |
LP3961EMP-5.0 |
800mA, |
Error |
Flag |
SOT223-5 |
LBSB |
1000 units on |
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Tape and Reel |
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5.0 |
LP3961EMPX-5.0 |
800mA, |
Error |
Flag |
SOT223-5 |
LBSB |
2000 units on |
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Tape and Reel |
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3.3 |
LP3961EMP-3.3 |
800mA, |
Error |
Flag |
SOT223-5 |
LAZB |
1000 units on |
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Tape and Reel |
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3.3 |
LP3961EMPX-3.3 |
800mA, |
Error |
Flag |
SOT223-5 |
LAZB |
2000 units on |
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Tape and Reel |
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2.5 |
LP3961EMP-2.5 |
800mA, |
Error |
Flag |
SOT223-5 |
LBBB |
1000 units on |
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Tape and Reel |
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2.5 |
LP3961EMPX-2.5 |
800mA, |
Error |
Flag |
SOT223-5 |
LBBB |
2000 units on |
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Tape and Reel |
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1.8 |
LP3961EMP-1.8 |
800mA, |
Error |
Flag |
SOT223-5 |
LBAB |
1000 units on |
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Tape and Reel |
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1.8 |
LP3961EMPX-1.8 |
800mA, |
Error |
Flag |
SOT223-5 |
LBAB |
2000 units on |
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Tape and Reel |
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5.0 |
LP3964EMP-5.0 |
800mA, SENSE |
SOT223-5 |
LBUB |
1000 units on |
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Tape and Reel |
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5.0 |
LP3964EMPX-5.0 |
800mA, SENSE |
SOT223-5 |
LBUB |
2000 units on |
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Tape and Reel |
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3.3 |
LP3964EMP-3.3 |
800mA, SENSE |
SOT223-5 |
LBJB |
1000 units on |
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Tape and Reel |
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3.3 |
LP3964EMPX-3.3 |
800mA, SENSE |
SOT223-5 |
LBJB |
2000 units on |
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Tape and Reel |
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2.5 |
LP3964EMP-2.5 |
800mA, SENSE |
SOT223-5 |
LBHB |
1000 units on |
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Tape and Reel |
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2.5 |
LP3964EMPX-2.5 |
800mA, SENSE |
SOT223-5 |
LBHB |
2000 units on |
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Tape and Reel |
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1.8 |
LP3964EMP-1.8 |
800mA, SENSE |
SOT223-5 |
LBFB |
1000 units on |
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Tape and Reel |
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1.8 |
LP3964EMPX-1.8 |
800mA, SENSE |
SOT223-5 |
LBFB |
2000 units on |
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Tape and Reel |
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ADJ |
LP3964EMP-ADJ |
800mA, ADJ |
SOT223-5 |
LBPB |
1000 units on |
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Tape and Reel |
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LP3961/LP3964
5 |
www.national.com |
LP3961/LP3964
Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output |
Order Number |
Description |
Package |
Package Marking |
Supplied As: |
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Voltage |
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(Current, Option) |
Type |
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ADJ |
LP3964EMPX-ADJ |
800mA, ADJ |
SOT223-5 |
LBPB |
2000 units on |
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Tape and Reel |
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5.0 |
LP3961ES-5.0 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-5.0 |
Rail |
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5.0 |
LP3961ESX-5.0 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ESX-5.0 |
Tape and Reel |
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3.3 |
LP3961ES-3.3 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-3.3 |
Rail |
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3.3 |
LP3961ESX-3.3 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-3.3 |
Tape and Reel |
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2.5 |
LP3961ES-2.5 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-2.5 |
Rail |
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2.5 |
LP3961ESX-2.5 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-2.5 |
Tape and Reel |
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1.8 |
LP3961ES-1.8 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-1.8 |
Rail |
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1.8 |
LP3961ESX-1.8 |
800mA, |
Error |
Flag |
TO263-5 |
LP3961ES-1.8 |
Tape and Reel |
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5.0 |
LP3964ES-5.0 |
800mA, SENSE |
TO263-5 |
LP3964ES-5.0 |
Rail |
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5.0 |
LP3964ESX-5.0 |
800mA, SENSE |
TO263-5 |
LP3964ES-5.0 |
Tape and Reel |
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3.3 |
LP3964ES-3.3 |
800mA, SENSE |
TO263-5 |
LP3964ES-3.3 |
Rail |
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3.3 |
LP3964ESX-3.3 |
800mA, SENSE |
TO263-5 |
LP3964ES-3.3 |
Tape and Reel |
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2.5 |
LP3964ES-2.5 |
800mA, SENSE |
TO263-5 |
LP3964ES-2.5 |
Rail |
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2.5 |
LP3964ESX-2.5 |
800mA, SENSE |
TO263-5 |
LP3964ES-2.5 |
Tape and Reel |
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1.8 |
LP3964ES-1.8 |
800mA, SENSE |
TO263-5 |
LP3964ES-1.8 |
Rail |
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1.8 |
LP3964ESX-1.8 |
800mA, SENSE |
TO263-5 |
LP3964ES-1.8 |
Tape and Reel |
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ADJ |
LP3964ES-ADJ |
800mA, ADJ |
TO263-5 |
LP3964ES-ADJ |
Rail |
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ADJ |
LP3964ESX-ADJ |
800mA, ADJ |
TO263-5 |
LP3964ES-ADJ |
Tape and Reel |
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5.0 |
LP3961ET-5.0 |
800mA, |
Error |
Flag |
TO220-5 |
LP3961ET-5.0 |
Rail |
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3.3 |
LP3961ET-3.3 |
800mA, |
Error |
Flag |
TO220-5 |
LP3961ET-3.3 |
Rail |
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2.5 |
LP3961ET-2.5 |
800mA, |
Error |
Flag |
TO220-5 |
LP3961ET-2.5 |
Rail |
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1.8 |
LP3961ET-1.8 |
800mA, |
Error |
Flag |
TO220-5 |
LP3961ET-1.8 |
Rail |
5.0 |
LP3964ET-5.0 |
800mA, SENSE |
TO220-5 |
LP3964ET-5.0 |
Rail |
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3.3 |
LP3964ET-3.3 |
800mA, SENSE |
TO220-5 |
LP3964ET-3.3 |
Rail |
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2.5 |
LP3964ET-2.5 |
800mA, SENSE |
TO220-5 |
LP3964ET-2.5 |
Rail |
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1.8 |
LP3964ET-1.8 |
800mA, SENSE |
TO220-5 |
LP3964ET-1.8 |
Rail |
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ADJ |
LP3964ET-ADJ |
800mA, ADJ |
TO220-5 |
LP3964ET-ADJ |
Rail |
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6 |
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