National Semiconductor LP3961, LP3964 Technical data
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LP3961/LP3964
800mA Fast Ultra Low Dropout Linear Regulators
LP3961/LP3964 800mA Fast Ultra Low Dropout Linear Regulators
May 2000
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
±
3.0% over all conditions ( varying line, load, and tempera-
ture).
±
1.5% at room temperature, and
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.02%
n 15µA quiescent current in shutdown mode
n Guaranteed output current of 0.8A DC
n Available in SOT-223,TO-263 and TO-220 packages
n Output voltage accuracy
n Error flag indicates output status (LP3961)
n Sense option improves better load regulation (LP3964)
n Extremely low output capacitor requirements
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
±
1.5%
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
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.
© 2000 National Semiconductor Corporation DS101129 www.national.com
Typical Application Circuits (Continued)
LP3961/LP3964
#
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.
DS101129-2
Block Diagram LP3961
DS101129-3
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Block Diagram LP3964
Block Diagram LP3964-ADJ
LP3961/LP3964
DS101129-29
Connection Diagrams
DS101129-30
DS101129-4
Top View
SOT 223-5 Package
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Connection Diagrams (Continued)
LP3961/LP3964
DS101129-5
Top View
TO220-5 Package
Bent, Staggered Leads
DS101129-6
Top View
TO263-5 Package
Pin Description for SOT223-5 Package
#
Pin
Name Function Name Function
1SD
2V
3V
IN
OUT
4 ERROR
5 GND Ground GND Ground
LP3961 LP3964
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE/ADJ Remote Sense Pin
Pin Description for TO220-5 and TO263-5 Packages
#
Pin
Name Function Name Function
1SD
2V
IN
3 GND Ground GND Ground
4V
OUT
5 ERROR
LP3961 LP3964
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE/ADJ Remote Sense Pin
Input Supply
Output Voltage
or output Adjust Pin
Input Supply
Output Voltage
or output Adjust Pin
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Ordering Information
Package Type Designator is ″MP″ for SOT223 package, ″T″ for TO220 package, and ″S″ for TO263 package.
TABLE 1. Package Marking and Ordering Information
LP3961/LP3964
DS101129-31
Output
Voltage
5.0 LP3961EMP-5.0 800mA, Error Flag
5.0 LP3961EMPX-5.0 800mA, Error Flag
3.3 LP3961EMP-3.3 800mA, Error Flag
3.3 LP3961EMPX-3.3 800mA, Error Flag
2.5 LP3961EMP-2.5 800mA, Error Flag
2.5 LP3961EMPX-2.5 800mA, Error Flag
1.8 LP3961EMP-1.8 800mA, Error Flag
1.8 LP3961EMPX-1.8 800mA, Error Flag
5.0 LP3964EMP-5.0 800mA, SENSE SOT223-5 LBUB 1000 units on
5.0 LP3964EMPX-5.0 800mA, SENSE SOT223-5 LBUB 2000 units on
3.3 LP3964EMP-3.3 800mA, SENSE SOT223-5 LBJB 1000 units on
3.3 LP3964EMPX-3.3 800mA, SENSE SOT223-5 LBJB 2000 units on
2.5 LP3964EMP-2.5 800mA, SENSE SOT223-5 LBHB 1000 units on
2.5 LP3964EMPX-2.5 800mA, SENSE SOT223-5 LBHB 2000 units on
1.8 LP3964EMP-1.8 800mA, SENSE SOT223-5 LBFB 1000 units on
1.8 LP3964EMPX-1.8 800mA, SENSE SOT223-5 LBFB 2000 units on
ADJ LP3964EMP-ADJ 800mA, ADJ SOT223-5 LBPB 1000 units on
Order Number Description
(Current, Option)
Package
Type
SOT223-5 LBSB 1000 units on
SOT223-5 LBSB 2000 units on
SOT223-5 LAZB 1000 units on
SOT223-5 LAZB 2000 units on
SOT223-5 LBBB 1000 units on
SOT223-5 LBBB 2000 units on
SOT223-5 LBAB 1000 units on
SOT223-5 LBAB 2000 units on
Package Marking Supplied As:
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
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Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output
Voltage
LP3961/LP3964
ADJ LP3964EMPX-ADJ 800mA, ADJ SOT223-5 LBPB 2000 units on
5.0 LP3961ES-5.0 800mA, Error Flag
5.0 LP3961ESX-5.0 800mA, Error Flag
3.3 LP3961ES-3.3 800mA, Error Flag
3.3 LP3961ESX-3.3 800mA, Error Flag
2.5 LP3961ES-2.5 800mA, Error Flag
2.5 LP3961ESX-2.5 800mA, Error Flag
1.8 LP3961ES-1.8 800mA, Error Flag
1.8 LP3961ESX-1.8 800mA, Error Flag
5.0 LP3964ES-5.0 800mA, SENSE TO263-5 LP3964ES-5.0 Rail
5.0 LP3964ESX-5.0 800mA, SENSE TO263-5 LP3964ES-5.0 Tape and Reel
3.3 LP3964ES-3.3 800mA, SENSE TO263-5 LP3964ES-3.3 Rail
3.3 LP3964ESX-3.3 800mA, SENSE TO263-5 LP3964ES-3.3 Tape and Reel
2.5 LP3964ES-2.5 800mA, SENSE TO263-5 LP3964ES-2.5 Rail
2.5 LP3964ESX-2.5 800mA, SENSE TO263-5 LP3964ES-2.5 Tape and Reel
1.8 LP3964ES-1.8 800mA, SENSE TO263-5 LP3964ES-1.8 Rail
1.8 LP3964ESX-1.8 800mA, SENSE TO263-5 LP3964ES-1.8 Tape and Reel
ADJ LP3964ES-ADJ 800mA, ADJ TO263-5 LP3964ES-ADJ Rail
ADJ LP3964ESX-ADJ 800mA, ADJ TO263-5 LP3964ES-ADJ Tape and Reel
5.0 LP3961ET-5.0 800mA, Error Flag
3.3 LP3961ET-3.3 800mA, Error Flag
2.5 LP3961ET-2.5 800mA, Error Flag
1.8 LP3961ET-1.8 800mA, Error Flag
5.0 LP3964ET-5.0 800mA, SENSE TO220-5 LP3964ET-5.0 Rail
3.3 LP3964ET-3.3 800mA, SENSE TO220-5 LP3964ET-3.3 Rail
2.5 LP3964ET-2.5 800mA, SENSE TO220-5 LP3964ET-2.5 Rail
1.8 LP3964ET-1.8 800mA, SENSE TO220-5 LP3964ET-1.8 Rail
ADJ LP3964ET-ADJ 800mA, ADJ TO220-5 LP3964ET-ADJ Rail
Order Number Description
(Current, Option)
Package
Type
TO263-5 LP3961ES-5.0 Rail
TO263-5 LP3961ESX-5.0 Tape and Reel
TO263-5 LP3961ES-3.3 Rail
TO263-5 LP3961ES-3.3 Tape and Reel
TO263-5 LP3961ES-2.5 Rail
TO263-5 LP3961ES-2.5 Tape and Reel
TO263-5 LP3961ES-1.8 Rail
TO263-5 LP3961ES-1.8 Tape and Reel
TO220-5 LP3961ET-5.0 Rail
TO220-5 LP3961ET-3.3 Rail
TO220-5 LP3961ET-2.5 Rail
TO220-5 LP3961ET-1.8 Rail
Package Marking Supplied As:
Tape and Reel
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LP3961/LP3964
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
(Survival) Short Circuit Protected
I
OUT
Maximum Voltage for ERROR Pin
Maximum Voltage for SENSE Pin V
Distributors for availability and specifications.
Storage Temperature Range −65˚C to +150˚C
Lead Temperature
(Soldering, 5 sec.) 260˚C
ESD Rating (Note 3) 2 kV
Power Dissipation (Note 2) Internally Limited
Input Supply Voltage (Survival) −0.3V to +7.5V
Shutdown Input Voltage (Survival) −0.3V to V
+0.3V
IN
Operating Ratings
Input Supply Voltage (Operating) 2.5V to 7.0V
Shutdown Input Voltage
(Operating) −0.3V to V
Maximum Operating Current
(DC) 0.8A
Operating Junction Temp. Range −40˚C to +125˚C
Output Voltage (Survival), (Note
6), (Note 7) −0.3V to +7.5V
Electrical Characteristics
LP3961/LP3964
Limits in standard typeface are for TJ= 25˚C, and limits in boldface type apply over the full operating temperature
range. Unless otherwise specified: VIN=V
Symbol Parameter Conditions Typ(Note
Output Voltage
V
O
Tolerance
(Note 8)
∆V
OL
Output Voltage Line
Regulation (Note 8)
∆V
/
O
∆I
OUT
Output Voltage Load
Regulation
(Note 8)
V
-
IN
V
OUT
Dropout Voltage
(Note 10)
Ground Pin Current In
I
GND
Normal Operation
Mode
I
GND
Ground Pin Current In
Shutdown Mode
(Note 11)
I
O(PK)
Peak Output Current (Note 2) 1.5 1.2
SHORT CIRCUIT PROTECTION
I
SC
Short Circuit Current 2.8 A
OVER TEMPERATURE PROTECTION
Tsh(t) Shutdown Threshold 165 ˚C
Tsh(h) Thermal Shutdown
Hysteresis
SHUTDOWN INPUT
T
V
T
SDT
dOFF
dON
I
SD
Shutdown Threshold
Turn-off delay IL= 800 mA 20 µs
Turn-on delay IL= 800 mA 25 µs
SD Input Current VSD=V
+ 1V, IL= 10 mA, C
O(NOM)
=10µF, VSD=VIN-0.3V.
OUT
LP3961/4 (Note 5) Units
+1V<V
V
OUT
10 mA
3.135 ≤ V
V
+1V<V
OUT
4)
<
7.0V
IN
<
<
I
800 mA
L
≤ 7.0 for
IN
= 2.5V
V
OUT
<
7.0V, 0.02
IN
0
Min Max
-1.5
-3.0
0.06
<
<
I
10 mA
800 mA 0.02
L
0.08
I
=80mA 24 30
L
= 800 mA 240 300
I
L
=80mA 3 9
I
L
= 800 mA 4 14
I
L
≤ 0.2V 15 25
V
SD
1.1
10 ˚C
Output = High V
IN
VIN–0.3
Output = Low 0 0.2
IN
1nA
+1.5
+3.0
35
350
10
15
75
VIN+0.3V
+0.3V
OUT
+0.3V
IN
%
%
%
mV
mA
µA
A
V
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