UNISONIC TECHNOLOGIES CO., LTD
LR3865
2A LOW DROPOUT LINEAR
REGULATOR
1
CMOS IC
DESCRIPTION
SOT-223
The UTC
LR3865
belonged to low-dropout, linear regulators
operate from 2.5V to 6V input and are guaranteed to deliver 2A.
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
LR3865
is designed and optimized for
battery-powered systems to work with low noise.
The UTC
LR3865
consumes less than 0.5μA in shutdown
mode. Other features include ultra low dropout voltage, current
limiting protection, thermal shutdown protection and high ripple
rejection ratio.
SOP-8
HSOP-8
FEATURES
* 2A Guaranteed Output Current
* 0.5μA Shutdown Current
* Current Limiting Protection
* Thermal Shutdown Protection
* Excellent Line/Load Transient
ORDERING INFORMATION
Package
SOT-223
SOP-8
HSOP-8
Pin Assignment
1
2
3
G
O
I
Refer to PIN
CONFIGURATION
Packing
Tape Reel
Tape Reel
Tape Reel
Ordering Number
Lead Free
Halogen Free
LR3865L-xx-AA3-A-R
LR3865G-xx-AA3-A-R
LR3865L-xx-S08-X-R
LR3865G-xx-S08-X-R
LR3865L-xx-SH2-R
LR3865G-xx-SH2-R
Notes: 1. xx: Output Voltage, refer to Marking Information.
2. Pin Assignment: G:GND
O:OUT
I:V
IN
LR3865G-xx-AA3-X-R
(1)Packing Type
(2)Pin Code
(3)Package Type
(4)Output Voltage Code
(5)Green Package
(1) R: Tape Reel
(2) refer to PIN CONFIGURATION
(3) AA3: SOT-223, S08: SOP-8, SH2: HSOP-8
(4) xx: Refer to Marking Information
(5) G: Halogen Free and Lead Free, L: Lead Free
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LR3865
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
CMOS IC
Pin Code
LR3865
SOT-223
SOP-8
HSOP-8
15: 1.5V
18: 1.8V
20: 2.0V
25: 2.5V
30: 3.0V
33: 3.3V
50: 5.0V
AD: ADJ
Voltage Code
1
2
3
L: Lead Free
G: Halogen Free
Date Code
8 7 6 5
UTC
Pin
Code
Voltage
Code
1 2 3 4
LR3865
Date Code
L: Lead Free
G: Halogen Free
Lot
Code
PIN CONFIGURATION
POK 1
EN 2
V
IN
3
NC 4
LR3865-A
8 GND
7 SET/ADJ
6 OUT
5 SS
EN 1
V
IN
2
OUT 3
SS 4
LR3865-B
SOP-8
8 GND
7 GND
6 GND
5 GND
POK 1
EN 2
V
IN
3
NC 4
HSOP-8
8 GND
7 SET/ADJ
6 OUT
5 SS
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LR3865
PIN DESCRIPTION
PIN No.
SOP-8
A
8
6
3
B
5~8
3
2
PIN NAME
GND
OUT
V
IN
POK
DESCRIPTION
CMOS IC
SOT-223
1
2
3
HSOP-8
8
6
3
-
1
-
1
-
2
1
2
EN
Ground
Output
Power Input Voltage. Supply voltage can range from
2.5V to 6V. Bypass with a 10µF capacitor to GND.
Open-Drain Power-ok Output. POK Remains low while
the output voltage is below the POK threshold. Connect
a 100 kohm Pullup resistor from POK to OUT
Active-High Enable Input. A logic low at EN reduces
supply current to 0.5µA. In shutdown, the POK output is
low. Connect
EN
to V
IN
for normal operation.
Soft start time setting. For adjustable soft start time
version, connect a capacitor from SS to gnd to set the
soft start time.
Voltage-setting Input. Connect SET to GND for preset
output. Connect an external resistive voltage-divider
from OUT to SET to set the output voltage between
0.6V and 4.5V. The SET regulation voltage is 600mV
Voltage-adjust Input. Connect an external resistive
voltage-divider from OUT to ADJ to set the output
voltage between 0.6V and 4.5V. The ADJ regulation
voltage is 600mV
-
5
4
5
SS
SET
-
7
-
7
ADJ
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LR3865
BLOCK DIAGRAM
CMOS IC
V
IN
V
IN
MOSFET
DRIVER WITH
I
LIM
OUT
EN
SS
EN LOGIC
THERMAL
SENSOR
+
-
ERROR
AMPLIFIER
V
REF
0.6V
POK
+
-
93.75% V
REF
+
-
+
-
100mV
+
-
SET/
ADJ
GND
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LR3865
ABSOLUTE MAXIMUM RATING
(T
A
=25°С, unless otherwise specified)
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
Supply Voltage
V
IN
6.5
V
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 RESISTANCES CHARACTERISTICS
PARAMETER
SYMBOL
SOT-223
SOP-8
HSOP-8
θ
JA
RATINGS
165
150
UNIT
C/W
C/W
Junction to Ambient
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C, V
IN
= OUT + 1V or V
IN
=2.5V whichever is greater, C
IN
= 10µF+0.1µF, C
OUT
= 10uF + (0.1uF + 0.1uF),
unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage
V
IN
Note1
6
V
Output Voltage Accuracy
T
A
＝25°С
, I
OUT
= 1mA ~2A
OUT
-2
2
%
(Preset Mode)
Maximum Output Current
I
OUT
3.8
A
Short-Circuit Current Limit
I
LIMIT
OUT=0V
3.8
A
I
Q
I
OUT
=1mA
200
Ground Pin Current
µA
I
OFF
EN=GND
0.5
5
Dropout Voltage (Note 2)
V
D
I
OUT
=2.0A
650
mV
Line Regulation (Note 3)
Load Regulation (Note 3, 4)
Power Supply Rejection Ratio
Shutdown Threshold
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
ADJ Voltage
ΔV
OUT
ΔV
IN
× V
OUT
V
IN
=OUT+1V~6V
V
IN
=OUT+1V, OUT=2.5V,
I
OUT
=10mA~2.0A
F=1Khz
1.8
0.08
0.3
45
0.55
1.0
%/V
%
dB
V
V
°С
°С
V
ΔOUT
PSRR
V
IH
V
IL
T
SHDN
DT
SHDN
V
ADJ
0.5
165
30
Measured on SET/ADJ,
I
OUT
=10mA
0.588
0.6
0.612
ADJ Mode Threshold
100
mV
Adjustable Output Voltage
0.8
4.5
V
SoftStart Current
I
SS
V
SS
=0
1.2
uA
Power-OK Threshold
V
pokth
Referred to OUT (nominal)
93.75
%
Power-OK Hysteresis
V
pokhys
6.25
%
Power-OK output Low Voltage
V
pokL
Sinking 1mA
0.4
V
Notes: 1. The minimum operating value for V
IN
is equal to either [OUT
(NOM)
+V
D
] or 2.5V, whichever is greater.
2. Dropout voltage is defined as the voltage from the input to output when output is 2% below the nominal
value. Dropout voltage specification applies only to output voltage of 2.5V and above .
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 10ms current pulse.
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