LR3865L-18-S08-X-R [UTC]
2A LOW DROPOUT LINEAR REGULATOR;
| 型号： | LR3865L-18-S08-X-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | 2A LOW DROPOUT LINEAR REGULATOR |
| 文件： | 总6页 (文件大小：195K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LR3865
Advance
CMOS IC
2A LOW DROPOUT LINEAR
REGULATOR
DESCRIPTION
SOP-8
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.
HSOP-8
FEATURES
* 2A Guaranteed Output Current
* 0.5μA Shutdown Current
* Current Limiting Protection
* Thermal Shutdown Protection
* Excellent Line/Load Transient
ORDERING INFORMATION
Ordering Number
Package
Packing
Lead Free
Halogen Free
LR3865L-xx-S08-X-R
LR3865L-xx-SH2-R
LR3865G-xx-S08-X-R
LR3865G-xx-SH2-R
SOP-8
Tape Reel
Tape Reel
HSOP-8
Note: xx: Output Voltage, refer to Marking Information.
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LR3865
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CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
15: 1.5V
18: 1.8V
20: 2.0V
25: 2.5V
30: 3.0V
33: 3.3V
50: 5.0V
AD: ADJ
SOP-8
HSOP-8
PIN CONFIGURATION
1
2
3
4
POK
EN
8 GND
1
EN
VIN
8 GND
7
6
5
SET/ADJ
OUT
2
3
4
7
6
5
GND
GND
GND
VIN
OUT
SS
NC
SS
LR3865-A
LR3865-B
SOP-8
POK
1
GND
8
EN
VIN
2
3
7 SET/ADJ
6
OUT
NC 4
SS
5
HSOP-8
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CMOS IC
PIN DESCRIPTION
PIN No.
PIN NAME
EN
DESCRIPTION
SOP-8
HSOP-8
2
A
2
B
1
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 VIN for normal operation.
Power Input Voltage. Supply voltage can range from
2.5V to 6V. Bypass with a 10µF capacitor to GND.
Output
3
6
2
3
3
6
VIN
OUT
Soft start time setting. For adjustable soft start time
version, connect a capacitor from SS to gnd to set the
soft start time.
5
8
1
4
5
8
1
SS
5, 6, 7, 8
-
GND
POK
Ground
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
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
SET
ADJ
7
-
7
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LR3865
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CMOS IC
BLOCK DIAGRAM
VIN
VIN
THERMAL
SENSOR
MOSFET
DRIVER WITH
ILIM
OUT
EN
SS
EN LOGIC
VREF
0.6V
+
-
ERROR
AMPLIFIER
POK
SET/
ADJ
+
+
-
-
+
-
+
-
93.75% VREF
100mV
GND
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LR3865
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CMOS IC
ABSOLUTE MAXIMUM RATING (TA=25°С, unless otherwise specified)
PARAMETER
SYMBOL
VIN
RATINGS
6.5
UNIT
V
Supply Voltage
Power Dissipation
PD
606
mW
°С
Junction Temperature
Operating Temperature
Storage Temperature
TJ
+125
TOPR
TSTG
-40 ~ +85
-65 ~ +150
°С
°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
Junction to Ambient
SYMBOL
RATINGS
165
UNIT
θJA
C/W
ELECTRICAL CHARACTERISTICS
(TA= 25°C, VIN = OUT + 1V or VIN =2.5V whichever is greater, CIN = 10µF+0.1µF, COUT = 10uF + (0.1uF + 0.1uF),
unless otherwise specified)
PARAMETER
Input Voltage
SYMBOL
VIN
TEST CONDITIONS
MIN
TYP
MAX
6
UNIT
V
Note1
Output Voltage Accuracy
(Preset Mode)
TA＝25°С , IOUT= 1mA ~2A
OUT
-2
2
%
Maximum Output Current
Short-Circuit Current Limit
IOUT
ILIMIT
IQ
3.8
3.8
200
0.5
A
A
OUT=0V
IOUT=1mA
EN=GND
IOUT=2.0A
Ground Pin Current
µA
IOFF
5
Dropout Voltage (Note 2)
Line Regulation (Note 3)
VD
∆V
OUT
∆V × V
IN OUT
650
mV
VIN=OUT+1V~6V
0.08
0.55
1.0
%/V
VIN=OUT+1V, OUT=2.5V,
Load Regulation (Note 3, 4)
Power Supply Rejection Ratio
Shutdown Threshold
∆OUT
0.3
45
%
I
OUT=10mA~2.0A
PSRR
VIH
F=1Khz
dB
V
1.8
VIL
0.5
V
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSHDN
DTSHDN
165
30
°С
°С
Measured on SET/ADJ,
ADJ Voltage
VADJ
0.588
0.8
0.6
0.612
4.5
V
I
OUT =10mA
ADJ Mode Threshold
Adjustable Output Voltage
SoftStart Current
100
mV
V
ISS
VSS=0
1.2
93.75
6.25
uA
%
%
V
Power-OK Threshold
Power-OK Hysteresis
Power-OK output Low Voltage
Vpokth
Vpokhys
VpokL
Referred to OUT (nominal)
Sinking 1mA
0.4
Notes: 1. The minimum operating value for VIN is equal to either [OUT(NOM)+VD] 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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CMOS IC
TYPICAL APPLICATION CIRCUIT
VOUT
R1= R2(
- 1)
VADJ
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all UTC products described or contained herein.
UTC products are not designed for use in life support appliances, devices or systems where malfunction
of these products can be reasonably expected to result in personal injury. Reproduction in whole or in
part is prohibited without the prior written consent of the copyright owner. UTC reserves the right to
make changes to information published in this document, including without limitation specifications and
product descriptions, at any time and without notice. This document supersedes and replaces all
information supplied prior to the publication hereof.
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