UNISONIC TECHNOLOGIES CO., LTD
LR3965
1.5A LOW DROPOUT LINEAR
REGULATOR
DESCRIPTION
The UTC
LR3965
belonged to low-noise, low-dropout, linear
regulators operate from 2.25V to 6V input and are guaranteed to
deliver 1.5A.
Wide range of preset output voltage options are
available. Built-in low on-resistance transistor provides low dropout
voltage and large output current.
The UTC
LR3965
is designed and
optimized for battery-powered systems to work with low noise.
The UTC
LR3965
consumes less than 0.01μA in shutdown
mode.
Other
features include ultra low dropout voltage, current
limiting protection, thermal shutdown protection and high ripple
rejection ratio.
CMOS IC
FEATURES
* 1.5A Guaranteed Output Current
* 0.01μA Shutdown Current
* 40mV Dropout at 150mA Load
* Low Temperature Coefficient
* Current Limiting Protection
* Thermal Shutdown Protection
* Excellent Line/Load Transient
* Sense Option Improves Load Regulation
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LR3965L-xx-AB3-C-R
LR3965G-xx-AB3-C-R
LR3965L-xx-AA3-A-R
LR3965G-xx-AA3-A-R
LR3965L-xx-AA3-D-R
LR3965G-xx-AA3-D-R
LR3965L-xx-TN3-A-R
LR3965G-xx-TN3-A-R
LR3965L-xx-TN3-A-T
LR3965G-xx-TN3-A-T
LR3965L-xx-TN3-D-R
LR3965G-xx-TN3-D-R
LR3965L-xx-TN3-D-T
LR3965G-xx-TN3-D-T
LR3965L-xx-TQ2-A-R
LR3965G-xx-TQ2-A-R
LR3965L-xx-TQ2-A-T
LR3965G-xx-TQ2-A-T
LR3965L-xx-TQ2-D-R
LR3965G-xx-TQ2-D-R
LR3965L-xx-TQ2-D-T
LR3965G-xx-TQ2-D-T
LR3965L-xx-TN4-R
LR3965G-xx-TN4-R
LR3965L-xx-TN4-T
LR3965G-xx-TN4-T
LR3965L-xx-TN5-R
LR3965G-xx-TN5-R
LR3965L-xx-TN5-T
LR3965G-xx-TN5-T
LR3965L-xx-TQ5-R
LR3965G-xx-TQ5-R
LR3965L-xx-TQ5-T
LR3965G-xx-TQ5-T
LR3965L-xx-S08-R
LR3965G-xx-S08-R
LR3965L-xx-S08-T
LR3965G-xx-S08-T
Note: Pin Assignment: I:V
IN
O:V
OUT
G:GND
Package
SOT-89
SOT-223
SOT-223
TO-252
TO-252
TO-252
TO-252
TO-263
TO-263
TO-263
TO-263
TO-252-4
TO-252-4
TO-252-5
TO-252-5
TO-263-5
TO-263-5
SOP-8
SOP-8
1
G
G
I
G
G
I
I
G
G
I
I
S
S
S
S
S
S
S
S
Pin Assignment
2 3 4 5 6 7 8
I O - - - - -
O I - - - - -
G O - - - - -
O I - - - - -
O I - - - - -
G O - - - - -
G O - - - - -
O I - - - - -
O I - - - - -
G O - - - - -
G O - - - - -
I G O A - - -
I G O A - - -
I G O A - - -
I G O A - - -
I G O A - - -
I G O A - - -
I O A G G G G
I O A G G G G
Packing
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
S: SHDN
A: ADJ/SENSE/SS/POK
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Copyright © 2012 Unisonic Technologies Co., Ltd
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LR3965
ORDERING INFORMATION(Cont.)
CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
SOT-223
SOT-89
Date Code
XX
LR3965X
1
2
TO-252
TO-263
TO-252-4
TO-252-5
TO-263-5
12 :1.2V
15 :1.5V
18 :1.8V
25 :2.5V
33 :3.3V
50 :5.0V
AD :ADJ
SOP-8
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
XX
12
15
18
25
33
50
:1.2V
:1.5V
:1.8V
:2.5V
:3.3V
:5.0V
Voltage Code
Pin Code
L: Lead Free
G: Halogen Free
3
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LR3965
PIN CONFIGURATION
CMOS IC
1
GND
2
V
IN
SOT-89
3
V
OUT
1
V
IN
2
GND
SOT-223
3
V
OUT
1
V
IN
2
GND
3
V
OUT
TO-252/TO-263
5
4
3
2
1
SENSE/ADJ/SS/POK
V
OUT
GND
V
IN
SHDN
SHDN 1
V
IN
2
V
OUT
3
8 GND
7 GND
6 GND
5 GND
SOP-8
SENSE/ADJ/SS/POK 4
TO-252-4/TO-252-5/TO-263-5
PIN DESCRIPTION
PIN NAME
V
IN
GND
SHDN
V
OUT
ADJ
SENSE
SS
POK
DESCRIPTION
Power Input Voltage. Supply voltage can range from 2.25V to 6V. Bypass with a 68µF capacitor
to GND.
Ground
Active-Low Shutdown Input. A logic low at SHDN reduces supply current to 0.01µA. In
shutdown, the POK output is low. Connect SHDN to V
IN
for normal operation.
Output Voltage
Voltage-adjust Input. Connect ADJ to GND for preset output. Connect an external resistive
voltage-divider from V
OUT
to ADJ to set the output voltage between 0.8V and 6V. The ADJ
regulation voltage is 800mV
Remote sense pin.
Soft start time setting. For adjustable soft start time version, connect a capacitor from SS to gnd
to set the soft start time.
Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (VOUT) is
below the POK threshold.
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QW-R102-037.P
LR3965
BLOCK DIAGRAM
V
IN
CMOS IC
ON
SHDN
SHDN
UVLO
Current Limit
OFF
Thermal
Sensor
V
OUT
SENSE
+
ERR AMP
V
REF
SS
-
POK
+
-
+
-
ADJ
93% V
REF
80mV
GND
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QW-R102-037.P
LR3965
ABSOLUTE MAXIMUM RATING
(T
A
=25°С, unless otherwise specified)
PARAMETER
SYMBOL
V
IN
CMOS IC
RATINGS
UNIT
Supply Voltage
6.5
V
SOP-8
606
SOT-223
714
Power Dissipation SOT-89
P
D
500
mW
TO-252/TO-252-5/TO-252-4
952
TO-263/TO-263-5
1250
Junction Temperature
T
J
+125
°С
Operating Temperature
T
OPR
-40 ~ +85
°С
Storage Temperature
T
STG
-65 ~ +150
°С
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
THERMAL DATA
PARAMETER
SOP-8
SOT-223
Junction to Ambient SOT-89
TO-252/TO-252-5/TO-252-4
TO-263/TO-263-5
SOP-8
SOT-223
Junction to Case
SOT-89
TO-252/TO-252-5/TO-252-4
TO-263/TO-263-5
SYMBOL
RATINGS
165
150
180
112
64
20
15
50
12
4
UNIT
θ
JA
°C/W
θ
JC
°C/W
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QW-R102-037.P
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