NSC LP3965ET-ADJ, LP3965ET-5.0, LP3965ET-3.3, LP3965ET-2.5, LP3965ESX-ADJ Datasheet
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May 2000
LP3962/LP3965
1.5A Fast Ultra Low Dropout Linear Regulators
General Description
The LP3962/LP3965 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 LP3962/LP3965 are developed on a CMOS process which allows low quiescent current operation independent of output load current. This CMOS process also allows the LP3962/LP3965 to operate 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 5mA at 1.5A 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 LP3962).
SENSE: Sense pin improves regulation at remote loads. (For LP3965)
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 0.04%
n15µA quiescent current in shutdown mode
nGuaranteed output current of 1.5A DC
nAvailable in SOT-223,TO-263 and TO-220 packages
nOutput voltage accuracy ± 1.5%
nError flag indicates output status (LP3962)
nSense option improves better load regulation (LP3965)
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
DS101266-1
# 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 5A.1 LP3962/LP3965
© 2000 National Semiconductor Corporation |
DS101266 |
www.national.com |
LP3962/LP3965
Typical Application Circuits (Continued)
DS101266-34
# 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 LP3962
DS101266-3
www.national.com |
2 |
Block Diagram LP3965
DS101266-29
Block Diagram LP3965-ADJ
DS101266-35
Connection Diagrams
DS101266-4
Top View
SOT 223-5 Package
LP3962/LP3965
3 |
www.national.com |
LP3962/LP3965
Connection Diagrams (Continued)
DS101266-5
Top View
TO220-5 Package
Bent, Staggered Leads
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DS101266-6 |
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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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LP3962 |
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LP3965 |
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Name |
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Function |
Name |
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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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2 |
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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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4 |
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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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LP3962 |
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LP3965 |
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Function |
Name |
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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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2 |
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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
DS101266-31
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 |
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Description |
Package |
Package |
Supplied As: |
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Voltage |
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(Current, Option) |
Type |
Marking |
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5.0 |
LP3962EMP-5.0 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBTB |
1000 units on Tape |
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and Reel |
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5.0 |
LP3962EMPX-5.0 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBTB |
2000 units on Tape |
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and Reel |
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3.3 |
LP3962EMP-3.3 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBEB |
1000 units on Tape |
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and Reel |
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3.3 |
LP3962EMPX-3.3 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBEB |
2000 units on Tape |
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and Reel |
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2.5 |
LP3962EMP-2.5 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBDB |
1000 units on Tape |
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and Reel |
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2.5 |
LP3962EMPX-2.5 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBDB |
2000 units on Tape |
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and Reel |
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1.8 |
LP3962EMP-1.8 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBCB |
1000 units on Tape |
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and Reel |
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1.8 |
LP3962EMPX-1.8 |
1.5A, |
Error |
Flag |
SOT223-5 |
LBCB |
2000 units on Tape |
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and Reel |
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5.0 |
LP3965EMP-5.0 |
1.5A, SENSE |
SOT223-5 |
LBVB |
1000 units on Tape |
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and Reel |
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5.0 |
LP3965EMPX-5.0 |
1.5A, SENSE |
SOT223-5 |
LBVB |
2000 units on Tape |
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and Reel |
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3.3 |
LP3965EMP-3.3 |
1.5A, SENSE |
SOT223-5 |
LBNB |
1000 units on Tape |
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and Reel |
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3.3 |
LP3965EMPX-3.3 |
1.5A, SENSE |
SOT223-5 |
LBNB |
2000 units on Tape |
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and Reel |
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2.5 |
LP3965EMP-2.5 |
1.5A, SENSE |
SOT223-5 |
LBLB |
1000 units on Tape |
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and Reel |
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2.5 |
LP3965EMPX-2.5 |
1.5A, SENSE |
SOT223-5 |
LBLB |
2000 units on Tape |
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and Reel |
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1.8 |
LP3965EMP-1.8 |
1.5A, SENSE |
SOT223-5 |
LBKB |
1000 units on Tape |
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and Reel |
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1.8 |
LP3965EMPX-1.8 |
1.5A, SENSE |
SOT223-5 |
LBKB |
2000 units on Tape |
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and Reel |
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ADJ |
LP3965EMP-ADJ |
1.5A, ADJ |
SOT223-5 |
LBRB |
1000 units on Tape |
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and Reel |
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LP3962/LP3965
5 |
www.national.com |
LP3962/LP3965
Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output |
Order Number |
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Description |
Package |
Package |
Supplied As: |
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Voltage |
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(Current, Option) |
Type |
Marking |
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ADJ |
LP3965EMPX-ADJ |
1.5A, ADJ |
SOT223-5 |
LBRB |
2000 units on Tape |
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and Reel |
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5.0 |
LP3962ES-5.0 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-5.0 |
Rail |
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5.0 |
LP3962ESX-5.0 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ESX-5.0 |
Tape and Reel |
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3.3 |
LP3962ES-3.3 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-3.3 |
Rail |
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3.3 |
LP3962ESX-3.3 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-3.3 |
Tape and Reel |
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2.5 |
LP3962ES-2.5 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-2.5 |
Rail |
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2.5 |
LP3962ESX-2.5 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-2.5 |
Tape and Reel |
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1.8 |
LP3962ES-1.8 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-1.8 |
Rail |
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1.8 |
LP3962ESX-1.8 |
1.5A, |
Error |
Flag |
TO263-5 |
LP3962ES-1.8 |
Tape and Reel |
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5.0 |
LP3965ES-5.0 |
1.5A, SENSE |
TO263-5 |
LP3965ES-5.0 |
Rail |
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5.0 |
LP3965ESX-5.0 |
1.5A, SENSE |
TO263-5 |
LP3965ES-5.0 |
Tape and Reel |
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3.3 |
LP3965ES-3.3 |
1.5A, SENSE |
TO263-5 |
LP3965ES-3.3 |
Rail |
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3.3 |
LP3965ESX-3.3 |
1.5A, SENSE |
TO263-5 |
LP3965ES-3.3 |
Tape and Reel |
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2.5 |
LP3965ES-2.5 |
1.5A, SENSE |
TO263-5 |
LP3965ES-2.5 |
Rail |
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2.5 |
LP3965ESX-2.5 |
1.5A, SENSE |
TO263-5 |
LP3965ES-2.5 |
Tape and Reel |
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1.8 |
LP3965ES-1.8 |
1.5A, SENSE |
TO263-5 |
LP3965ES-1.8 |
Rail |
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1.8 |
LP3965ESX-1.8 |
1.5A, SENSE |
TO263-5 |
LP3965ES-1.8 |
Tape and Reel |
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ADJ |
LP3965ES-ADJ |
1.5A, ADJ |
TO263-5 |
LP3965ES-ADJ |
Rail |
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ADJ |
LP3965ESX-ADJ |
1.5A, ADJ |
TO263-5 |
LP3965ES-ADJ |
Tape and Reel |
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5.0 |
LP3962ET-5.0 |
1.5A, |
Error |
Flag |
TO220-5 |
LP3962ET-5.0 |
Rail |
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3.3 |
LP3962ET-3.3 |
1.5A, |
Error |
Flag |
TO220-5 |
LP3962ET-3.3 |
Rail |
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2.5 |
LP3962ET-2.5 |
1.5A, |
Error |
Flag |
TO220-5 |
LP3962ET-2.5 |
Rail |
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1.8 |
LP3962ET-1.8 |
1.5A, |
Error |
Flag |
TO220-5 |
LP3962ET-1.8 |
Rail |
5.0 |
LP3965ET-5.0 |
1.5A, SENSE |
TO220-5 |
LP3965ET-5.0 |
Rail |
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3.3 |
LP3965ET-3.3 |
1.5A, SENSE |
TO220-5 |
LP3965ET-3.3 |
Rail |
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2.5 |
LP3965ET-2.5 |
1.5A, SENSE |
TO220-5 |
LP3965ET-2.5 |
Rail |
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1.8 |
LP3965ET-1.8 |
1.5A, SENSE |
TO220-5 |
LP3965ET-1.8 |
Rail |
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ADJ |
LP3965ET-ADJ |
1.5A, ADJ |
TO220-5 |
LP3965ET-ADJ |
Rail |
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www.national.com |
6 |
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