UNISONIC TECHNOLOGIES CO., LTD
LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
700mA HIGH SPEED LDO
REGULATOR WITH REVERSE
CURRENT PROTECTION
1
SOT-89-5
DESCRIPTION
4
The UTC LR1803 operate from a +1.7V ~ +6V input supply as
fast low-dropout linear regulators. Wide output voltage range
options are available. The fast response characteristic to make
UTC LR1803 suitable for low voltage microprocessor application.
The low quiescent current operation and low dropout quality
caused by the CMOS process.
The UTC LR1803 has low dropout voltage. The ground pin
current is typically 100μA. Output Voltage Precision: Multiple
output voltage options are available and ranging from 1.5V~5V at
room temperature with a guaranteed accuracy of ±1.5%, and
±3.0% when varying line and load. With the reverse current
protection unction of a driver transistor, the reverse current flow is
prohibited when VOUT voltage is higher than VIN voltage. For an
example, when a battery is connected to the VOUT pin, battery
current will not flow back to the UTC LR1803.
5
1 2
3
SOT-25
FEATURES
* The Guaranteed Output Current is 700mA DC
* Low Power Consumption: 100μA
* Dropout Voltage: 120mV @IOUT=300mA (VOUT=3.0V)
* Output Voltage Accuracy ±1.5%
* The reverse current protection
ORDERING INFORMATION
Note:
Ordering Number
LR1803G-xx-AB5-R
LR1803G-xx-AF5-R
xx: Output Voltage, refer to Marking Information.
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Copyright © 2016 Unisonic Technologies Co., Ltd
Package
SOT-89-5
SOT-25
Packing
Tape Reel
Tape Reel
1 of 7
QW-R102-081.a
LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT-25
15 : 1.5V
18: 1.8V
25: 2.5V
28: 2.8V
30: 3.0V
33: 3.3V
50: 5.0V
SOT-89-5
PIN CONFIGURATION
PIN DESCRIPTION
PIN NO.
SOT-25
SOT-89-5
1
4
2
2
3
1
4
3
5
5
MARKING
PIN NAME
VIN
VSS
CE
NC
VOUT
DESCRIPTION
Power Input
Ground
ON/OFF Control
No Connection
Output
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QW-R102-081.a
LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
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LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
VIN
VOUT
VCE
RATINGS
UNIT
6.5
V
6.5
V
6.5
V
SOT-25
250
mW
Power Dissipation
PD
SOT-89-5
500
mW
Operating Ambient Temperature
TOPR
-40 ~ +85
°C
Storage Temperature
TSTG
-55 ~ +125
°C
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.
Input Voltage
Output Voltage
CE Input Voltage
ELECTRICAL CHARACTERISTICS (TA=25°C)
PARAMETER
Output Voltage
Output Current
Load Regulation
Dropout Voltage
Supply Current
Stand-by Current
Line Regulation
Input Voltage
Output Voltage
Temperature
Characteristics
Power Supply
Rejection Ratio
Limit Current
Short Current
CE High Level Voltage
CE Low Level Voltage
CE High Level Current
CE Low Level Current
Reverse Current
VOUT Pin Sink Current
Thermal Shutdown
Detect Temperature
Thermal Shutdown
Release Temperature
SYMBOL CIRCUIT
TEST CONDITIONS
MIN
TYP
MAX UNIT
VOUT(E)
1
VCE=VIN, IOUT=10mA
×0.985 VOUT(T) ×1.015
V
IOUTMAX
1
VCE=VIN, VIN=VOUT(T)+1.0V
700
mA
∆VOUT
1
VCE=VIN, 0.1mA≤IOUT≤300mA
-20
5
20
mV
Vdif
1
IOUT=300mA, VCE=VIN
120
300
mV
ISS
2
VIN=VCE=VOUT(T)+1.0V, IOUT=0mA
100
200
μA
ISTBY
2
VIN=6.0V, VCE=VSS
0.3
1.5
μA
VOUT(T)+0.5V≤VIN≤6.0V
∆VOUT/
1
0.01
0.1
%/V
(∆VIN · VOUT)
VCE=VIN, IOUT=30mA
VIN
1
6.0
V
∆VOUT/
(∆TA · VOUT)
1
PSRR
3
ILIM
Ishort
VCEH
VCEL
ICEH
ICEL
IREV
IREVS
1
1
1
1
1
1
1
1
TTSD
1
TTSR
1
VCE=VIN, IOUT=30mA
-40°C≤TA≤85°C
±100
ppm
/°C
65
dB
950
450
0.3
0.3
mA
mA
V
V
μA
μA
μA
μA
Junction Temperature
150
°C
Junction Temperature
125
°C
VIN={VOUT(T)+1.0}VDC+0.5Vp-pAC
VCE=VIN, IOUT=30mA, f=1kHz
VCE=VIN, VIN=VOUT(T)+1.0V
VCE=VIN, Short VOUT to VSS Level
1.5
0.3
VCE=VIN=6.0V
VCE=VSS
VIN=0V, VOUT=6.0V
VIN=5.0V, VOUT=6.0V
UNISONIC TECHNOLOGIES CO., LTD
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720
2.0
-0.1
0.1
4 of 7
QW-R102-081.a
LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
Circuit 1
A
VIN
V
CIN(ceramic)
A
CE
A
VOUT
V
V
CL
(ceramic)
VSS
Circuit 2
VIN
V
CIN(ceramic)
CE
VOUT
CL (ceramic)
VSS
A
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QW-R102-081.a
LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT (Cont.)
Circuit 3
VIN
IOUT
V
A
VOUT
CE
VSS
CL
(ceramic)
V
CIN: 2.2μF or higher
CL: 2.2μF or higher (VOUT=2.5~5.0V)
4.7μF or higher (VOUT=2.1~2.45V)
6.8μF or higher (VOUT=0.8~2.05V)
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LR1803
Preliminary
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
USB 5V
VIN
VOUT Sink Current
(TYP: 0.1μA)
CIN:2.2μF
(ceramic)
CE
UTC
LR1803
VOUT
To System LSI
CL:2.2μF
(ceramic)
VSS
IOUT
Battery
VIN
Step-Up
DC/DC VOUT
Converter
VSS
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. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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