UNISONIC TECHNOLOGIES CO., LTD
LR3866
Preliminary
LINEAR INTEGRATED CIRCUIT
3.0A LOW DROPOUT LINEAR
REGULATOR
DESCRIPTION
The
LR3866
is a low-noise, low-dropout linear regulator
operated from a 2.5V to 6V input voltage and is guaranteed to
deliver 3A output current. Wide range of preset output voltage
options are available. Built-in low on-resistance transistor provides
low dropout voltage and large output current. The
LR3866
is
designed and optimized for battery-powered systems to work with
low noise.
The
LR3866
is developed on a CMOS process technology
which allows low quiescent current operation independent of output
load current. This CMOS process also allows the
LR3866
to operate
under extremely low dropout conditions.
FEATURES
* 3A Guaranteed Output Current
* Ultra Low Dropout Voltage
* Low Ground Pin Current
* Low Temperature Coefficient
* Current Limiting Protection
* Thermal Shutdown Protection
* Excellent Line/Load Transient
* SENSE Option Improves Load Regulation
ORDERING INFORMATION
Pin Assignment
1
2
3
4
TO-263
G O
I
-
TO-263
G O
I
-
TO-263
I
G O
-
TO-263
I
G O
-
TO-263-5
E
I
G O
TO-263-5
E
I
G O
TO-263-5
E
I
G O
TO-263-5
E
I
G O
A: ADJ S: SENSE
Package
5
-
-
-
-
S
S
A
A
Packing
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
Ordering Number
Lead Free
Halogen Free
LR3866L-xx-TQ2-A-T
LR3866G-xx-TQ2-A-T
LR3866L-xx-TQ2-A-R
LR3866G-xx-TQ2-A-R
LR3866L-xx-TQ2-D-T
LR3866G-xx-TQ2-D-T
LR3866L-xx-TQ2-D-R
LR3866G-xx-TQ2-D-R
LR3866L-xx-TQ5-T
LR3866G-xx-TQ5-T
LR3866L-xx-TQ5-R
LR3866G-xx-TQ5-R
LR3866L-AD-TQ5-T
LR3866G-AD-TQ5-T
LR3866L-AD-TQ5-R
LR3866G-AD-TQ5-R
Note: Pin Assignment: G: GND
I: V
IN
O: V
OUT
E: EN
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Copyright © 2019 Unisonic Technologies Co., Ltd
1 of 6
QW-R102-100.b
LR3866
PACKAGE
VOLTAGE CODE
Preliminary
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
MARKING
TO-263
18 :1.8V
33 :3.3V
TO-263-5
18 :1.8V
33 :3.3V
AD: ADJ
PIN CONFIGURATION
PIN DESCRIPTION
PIN NAME
EN
V
IN
GND
V
OUT
ADJ
SENSE
DESCRIPTION
Chip Enable (Active High). EN is internally pulled up by a resistor.It can be floating for normal
operate.
Power Input Voltage. Supply voltage can range from 2.5V to 6V. Bypass with a 68µF capacitor to
GND.
Ground
Output Voltage
Voltage-adjust Input. Connect an external resistive voltage-divider from V
OUT
to ADJ to set the
output voltage between 0.6V and 5V.
Remote sense pin.
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QW-R102-100.b
LR3866
BLOCK DIAGRAM
For LR3866-xx
Preliminary
LINEAR INTEGRATED CIRCUIT
For LR3866-ADJ
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3 of 6
QW-R102-100.b
LR3866
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
(T
A
=25°С)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Supply Voltage(Survival)
V
IN
6
V
Enable Input Voltage(Survival)
V
EN
6
V
Power Dissipation
P
D
890
mW
Operation Junction Temperature
T
OPR
-40 ~ +125
°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.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified: V
IN
=V
O(NOM)
+1V or V
IN
=2.5V whichever is greater, I
L
=10mA, C
IN
=68µF, C
OUT
=33µF,
V
EN
=V
IN
-0.3V, T
J
=25°C.)
PARAMETER
SYMBOL
TEST CONDITION
MIN
TYP
MAX UNITS
10mA<I
L
<3A
-2
2
%
Output Voltage Tolerance
V
OUT
V
OUT
+1V<V
IN
<6V
10mA<I
L
<1.5A
Adjustable Pin Voltage
V
ADJ
0.588
0.6
0.612
V
(ADJ version)
V
OUT
+1V<V
IN
<6V
Line Regulation (Note 1)
REGLINE V
OUT
+1V≤V
IN
≤6V
0.08
0.18
%/V
Load Regulation (Note 1, 2)
REGLOAD 10mA≤I
L
≤3A
0.6
0.8
%/A
Dropout Voltage (Note 3)
V
DROP
I
L
=3A
650
800
mV
I
L
=300mA
200
360
I
GND1
µA
Ground Pin Current
I
L
=3A
200
360
I
GND2
V
EN
<0.2V
0.1
5
µA
Output Peak Current
I
PEAK
3.5
4.5
A
V
IH
Output=High
V
IN
/2+0.5
V
IN
Enable Threshold
V
V
IL
Output=Low
0
V
IN
/2-0.5
I
ENH
V
EN
=V
IN
0.05
2
µA
Enable Input Current
I
ENL
V
EN
<0.2V
3
10
Thermal Shutdown Temperature
T
SD
165
°С
Thermal Shutdown Hysteresis
DT
SD
30
°С
Notes: 1. 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.
2. 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 3.0A
3. 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 voltages of 2.5V and above.
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www.unisonic.com.tw
4 of 6
QW-R102-100.b
LR3866
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
*
LR3866
can deliver a continuous current of 3.0A over the full operating temperature. However, the output current is
limited by the restriction of power dissipation which differs from packages. A heat sink may be required depending
on the maximum power dissipation and maximum ambient temperature of application. With respect to the applied
package, the maximum output current of 3.0A may be still undeliverable.
* When a Pull-Up resistor is connected between V
EN
terminal and V
EN
Signal (or V
IN
line), the resistance of the
Pull-Up resistor should be kept under 10kΩ.
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FPGA/CPLD
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