UNISONIC TECHNOLOGIES CO., LTD
LR3965 CMOS IC
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Copyright © 2012 Unisonic Technologies Co., Ltd QW-R102-037.P
1.5
A
LO
W
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.
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
Note: Pin Assignment: I:VIN O:VOUT G:GND S: SHDN A: ADJ/SENSE/SS/POK
Ordering Number Package Pin Assignment Packing
Lead Free Halogen Free 1 2 3 4 5 6 7 8
LR3965L-xx-AB3-C-R LR3965G-xx-AB3-C-R SOT-89 G I O - - - - - Tape Reel
LR3965L-xx-AA3-A-R LR3965G-xx-AA3-A-R SOT-223 G O I - - - - - Tape Reel
LR3965L-xx-AA3-D-R LR3965G-xx-AA3-D-R SOT-223 I G O - - - - - Tape Reel
LR3965L-xx-TN3-A-R LR3965G-xx-TN3-A-R TO-252 G O I - - - - - Tape Reel
LR3965L-xx-TN3-A-T LR3965G-xx-TN3-A-T TO-252 G O I - - - - - Tube
LR3965L-xx-TN3-D-R LR3965G-xx-TN3-D-R TO-252 I G O - - - - - Tape Reel
LR3965L-xx-TN3-D-T LR3965G-xx-TN3-D-T TO-252 I G O - - - - - Tube
LR3965L-xx-TQ2-A-R LR3965G-xx-TQ2-A-R TO-263 G O I - - - - - Tape Reel
LR3965L-xx-TQ2-A-T LR3965G-xx-TQ2-A-T TO-263 G O I - - - - - Tube
LR3965L-xx-TQ2-D-R LR3965G-xx-TQ2-D-R TO-263 I G O - - - - - Tape Reel
LR3965L-xx-TQ2-D-T LR3965G-xx-TQ2-D-T TO-263 I G O - - - - - Tube
LR3965L-xx-TN4-R LR3965G-xx-TN4-R TO-252-4 S I G O A - - - Tape Reel
LR3965L-xx-TN4-T LR3965G-xx-TN4-T TO-252-4 S I G O A - - - Tube
LR3965L-xx-TN5-R LR3965G-xx-TN5-R TO-252-5 S I G O A - - - Tape Reel
LR3965L-xx-TN5-T LR3965G-xx-TN5-T TO-252-5 S I G O A - - - Tube
LR3965L-xx-TQ5-R LR3965G-xx-TQ5-R TO-263-5 S I G O A - - - Tape Reel
LR3965L-xx-TQ5-T LR3965G-xx-TQ5-T TO-263-5 S I G O A - - - Tube
LR3965L-xx-S08-R LR3965G-xx-S08-R SOP-8 S I O A G G G G Tape Reel
LR3965L-xx-S08-T LR3965G-xx-S08-T SOP-8 S I O A G G G G Tube
LR3965 CMOS IC
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ORDERING INFORMATION(Cont.)
MARKING INFORMATION
PACKAGE VOLTAGE CODE MARKING
SOT-223
12 :1.2V
15 :1.5V
18 :1.8V
25 :2.5V
33 :3.3V
50 :5.0V
SOT-89
123
XX
LR3965X
Date Code
Voltage Code
L: Lead Free
G: Halogen Free
Pin Code
XX
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
LR3965 CMOS IC
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PIN CONFIGURATION
GND VOUT
VIN
TO-252/TO-263
SHDN
VIN
VOUT
GND
GND
GND
GND
8
7
6
54
3
2
1
SOP-8
123
VIN GND VOUT
SOT-223
123
GND VIN VOUT
SOT-89
123
1
2
3
4
5SENSE/ADJ/SS/POK
VOUT
GND
VIN
TO-252-4/TO-252-5/TO-263-5
SHDN SENSE/ADJ/SS/POK
PIN DESCRIPTION
PIN NAME DESCRIPTION
VIN Power Input Voltage. Supply voltage can range from 2.25V to 6V. Bypass with a 68µF capacitor
to GND.
GND Ground
SHDN 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 VIN for normal operation.
VOUT Output Voltage
ADJ
Voltage-adjust Input. Connect ADJ to GND for preset output. Connect an external resistive
voltage-divider from VOUT to ADJ to set the output voltage between 0.8V and 6V. The ADJ
regulation voltage is 800mV
SENSE Remote sense pin.
SS Soft start time setting. For adjustable soft start time version, connect a capacitor from SS to gnd
to set the soft start time.
POK Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (VOUT) is
below the POK threshold.
LR3965 CMOS IC
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BLOCK DIAGRAM
SHDN
VREF
OFF
ON
80mV
93% VREF
GND
ADJ
SS
VOUT
SHDN
POK
VIN
SENSE
+
-
+
-
ERR AMP
+
-
UVLO Current Limit Thermal
Sensor
LR3965 CMOS IC
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ABSOLUTE MAXIMUM RATING (TA=25°С, unless otherwise specified)
PARAMETER SYMBOL RATINGS UNIT
Supply Voltage VIN 6.5 V
Power Dissipation
SOP-8
PD
606
mW
SOT-223 714
SOT-89 500
TO-252/TO-252-5/TO-252-4 952
TO-263/TO-263-5 1250
Junction Temperature TJ +125 °С
Operating Temperature TOPR -40 ~ +85 °С
Storage Temperature TSTG -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 SYMBOL RATINGS UNIT
Junction to Ambient
SOP-8
θJA
165
°C/W
SOT-223 150
SOT-89 180
TO-252/TO-252-5/TO-252-4 112
TO-263/TO-263-5 64
Junction to Case
SOP-8
θJC
20
°C/W
SOT-223 15
SOT-89 50
TO-252/TO-252-5/TO-252-4 12
TO-263/TO-263-5 4
LR3965 CMOS IC
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ELECTRICAL CHARACTERISTICS
(TA= 25°C, VIN = VOUT + 1V or VIN =2.25V whichever is greater, CIN = 68µF, COUT =33µF, unless otherwise specified)
PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT
Input Voltage VIN Note1 6 V
Output Voltage Accuracy
(Preset Mode) VOUT TA＝25°С , IOUT= 1mA ~1.5A -2 2 %
TA＝0~85°С, IOUT= 1mA~1.5A -3 3 %
Maximum Output Current IOUT 1.5 A
Short-Circuit Current Limit ILIMIT V
OUT=0V 2.5 A
Ground Pin Current IGND IOUT = 0mA 200 µA
IOUT= 1mA to 1.5A 250 µA
Dropout Voltage (Note 2) VD I
OUT=1.5A VOUT
(
NOM
)
<=1.8V 1000 1050 mV
1.8V<VOUT
(
NOM
)
550
Line Regulation (Note 3) OUTIN
OUT
V×ΔV
ΔVVIN=VOUT+VD~6V 0.08 0.55 %/V
Load Regulation (Note 3, 4) ΔVOUT V
IN=VOUT+VD, IOUT=10mA~1.5A 0.25 0.5 %
Output Voltage Noise eN f=10Hz to1MHz, COUT=33μF 300 µVRMS
Shutdown Supply Current IOFF GND=SHDN 0.01 5 µA
Shutdown Threshold VIH 1.6 V
VIL 0.6 V
Thermal Shutdown Temperature TSHDN 170 °С
Thermal Shutdown Hysteresis DTSHDN 20 °С
ADJ Voltage VREF Measured on ADJ, IOUT =10mA 0.774 0.8 0.826 V
ADJ Mode Threshold 80 mV
Adjustable Output Voltage 0.8 5 V
POK Output Low Voltage VOL Sinking 2mA 5 50 mV
Operating Voltage Range for
Valid POK Output Sinking 100µA 1.0 5.5 V
POK Output High Leakage
Current V
POK=5.5V 100 nA
POK Threshold Rising edge, referred to VOUT
(
NOM
)
90 93 96 %
Note 1: The minimum operating value for VIN is equal to either [VOUT(NOM)+VD] or 2.25V, whichever is greater
2: Dropout voltage is defined as the voltage from the input to output when output is 2% below the nominal
value.
3: Output voltage line regulation is defined as the change in output voltage from the nominal value resulting
from a change in the input line voltage. Output voltage load regulation is defined as the change in output
voltage from the nominal value as the load current increases from no load to full load.
4: Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested
for load regulation in the load range from 10mA to 1.5A
LR3965 CMOS IC
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TYPICAL APPLICATION CIRCUIT
LR3965
VIN VOUT
GND
VOUT
COUT
33µF
VIN CIN
68µF
LR3965
VIN
VOUT
COUT
33µF
VIN CIN
68μF
GND
SENSE
VOUT
SHDN
L
O
A
D
ON
OFF
++
LR3965 CMOS IC
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TYPICAL APPLICATION CIRCUIT (Cont.)
LR3965 CMOS IC
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TYPICAL CHARACTERISTICS
0123456
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Output Voltage, VOUT (V)
Input Voltage, VIN (V)
Output Voltage vs Input Voltage
IOUT=1.5A
IOUT=0mA
20 30 40 50 60 70 80 90 100 110120130 140
-2.00
-1.75
-1.50
-1.25
-1.00
-0.75
-0.50
-0.25
0.00
0.25
Vout Votalge Change (%)
Air Ambient Temperature(°С)
Ambient Temperature vs.
Output Voltage Change
0 200 400 600 800 1000 1200 1400 1600
0
50
100
150
200
250
300
350
400
Drop-Out (mV)
Output Current, IOUT (mA)
Drop-Out Voltage vs. Load Current Ground Pin Current vs. Input Voltage
23456
50
100
150
200
250
300
Ground Pin Current, IGND (µA)
Input Voltage, VIN (V)
Line Transient
VOUT
VIN
CIN=COUT=10μF(Ceramic,Y5V)
LR3965-2.5V
VIN(V)
2.7
2.5
2.3
5.0
4.0
3.0
VOUT(V)
IOUT=100mA
Line Transient
VOUT
VIN
CIN=COUT=10μF(Ceramic,Y5V)
LR3965-1.8V
VIN(V)
2.0
1.8
1.6
5.0
4.0
3.0
VOUT(V)
IOUT=100mA
LR3965-2.5V
LR3965 CMOS IC
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TYPICAL CHARACTERISTICS (Cont.)
Load Transient
VOUT
IOUT
CIN=COUT=10μF(Ceramic,Y5V)
LR3965-2.5V
1000
500
0
2.55
2.5
2.45
Shutdown
VSHDN
VOUT
IOUT
CIN=COUT=10μF(Ceramic,Y5V)
VIN=5V,T=25°C
100
0
2
1
0
5
0
LR3965-2.5V
ILOAD =1mA to 700mA
