Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1801
CMOS IC
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR

DESCRIPTION
The UTC LR1801 operate from a +1.5V ~ +6V input supply as
fast ultra low-dropout linear regulators. Wide output voltage range
options are available. The fast response characteristic to make
UTC LR1801 suitable for low voltage microprocessor application.
The low quiescent current operation and low dropout quality
caused by the CMOS process.
The UTC LR1801 has low dropout voltage. The ground pin
current is typically 60uA.
Output Voltage Precision: Multiple output voltage options are
available and ranging from 1.2V ~ 5.0V at room temperature with a
guaranteed accuracy of ±1.5%, and ±3.0% when varying line and
load.
The output voltage types of UTC LR1801-xx are fixed one in
the IC and UTC LR1801-AD are adjustable one.

FEATURES
* Low Dropout Voltage
* The Guaranteed Output Current is 1A DC
* Output Voltage Accuracy ± 1.5%
* Over temperature Protection And Over current Protection

ORDERING INFORMATION
-
Ordering Number
Halogen Free
1 -R
LR1801G-xx-AA3-○
-
1 -R
LR1801G-xx-AB3-○
SOT-89
1 -R
LR1801L-xx-TN3-○
1 -R
LR1801G-xx-TN3-○
TO-252
LR1801G-xx-SH2-R
O: VOUT I: VIN
HSOP-8
Lead Free
Note: Pin Assignment: G: GND
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Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-223
Pin Assignment
1
○
Pin Code 1
A
G
B
O
C
G
D
I
2
O
G
I
G
Packing
3
I
I
O
O
refer to Pin Configuration
Tape Reel
Tape Reel
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LR1801

CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
LR1801G
SOT-223
Pin Code
Date Code
Voltage Code
1
SOT-89
2
3
12: 1.2V
15 : 1.5V
18: 1.8V
25: 2.5V
30: 3.0V
33: 3.3V
50: 5.0V
AD: ADJ
TO-252
HSOP-8

PIN CONFIGURATION
VOUT
1
ON/ OFF
2
8
VIN
VOUT
1
7
NC
ADJ
2
GND

8
VIN
7
ON/O
GND
NC
3
6
NC
NC
3
6
NC
GND
4
5
NC
GND
4
5
NC
PIN DESCRIPTION
PIN NO.
HSOP-8
HSOP-8
(Fixed)
(Adjustable)
4
4
1
1
8
8
2
PIN NAME
7
GND
VOUT
VIN
ON /OFF
PIN DESCRIPTION
GND
Output voltage
Input voltage
ON/OFF select pin, when connected to the ground the chip in
operating normally.
No connection
Adjustable Pin
3, 5,6,7
3, 5,6,
NC
2
ADJ
Note: The NC pin is electrically open.
The NC pin can be connected to VIN or GND.
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LR1801

CMOS IC
BLOCK DIAGRAM
Fixed Output Voltage
Adjustable Output Voltage
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LR1801

CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VIN
7
V
Shutdown Input Voltage
VIN(SHDN)
-0.3~VIN
V
Maximum Operating Current (DC)
1
A
Power Dissipation (Note 3)
PD
Internally Limited
Junction Temperature
TJ
+125
°C
Storage Temperature
TSTG
-65 ~ +150
°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.

THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case
SYMBOL
SOT-223
SOT-89
TO-252
HSOP-8
SOT-223
SOT-89
TO-252
HSOP-8
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θJA
θJC
RATINGS
165
185
115
143
23
85
20
45
UNIT
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
°C/W
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CMOS IC
ELECTRICAL CHARACTERISTICS (TJ = 25°C, unless otherwise specified.)
For LR1801-xx
PARAMETER
Input Voltage
SYMBOL
VIN
Output Voltage (Note 3)
VOUT(E)
Output Voltage Line
Regulation
Output Voltage Load
Regulation
TEST CONDITIONS
VIN=VOUT(S)+1V
IOUT=100mA
△VOUT2
VIN=VOUT(S)+1V,1mA≤IOUT≤300mA
Vdrop
IOUT=1000mA
Output Current(Note 5)
1.5V≤VOUT(S) ≤3.5V
IOUT
VIN=VOUT(S)+1V, ON/OFF pin=ON, No
Load
VIN=VOUT(S)+1V, ON/OFF pin=OFF,
ISS2
No Load
VIN=VOUT(S)+1V, ON/OFF pin=ON,
Short Circuit Current
ISC
VOUT=0V
△VOUT/ VIN=VOUT(S)+1V,IOUT=100mA,
Output Voltage Temperature
(△TA×VOUT) -40°C ≤ TA≤+85°C
Coefficient(Note 6)
ON/OFF Pin Input Voltage “H”
VSH
VIN=VOUT(S)+1V, RL=1.0KΩ
Determinied by VOUT output level
ON/OFF Pin Input Voltage “L”
VSL
ON/OFF Pin Input Current “H”
ISH
VIN=VOUT(S)+1V,VON/OFF=5.5V
ON/OFF Pin Input Current “L”
ISL
VIN=VOUT(S)+1V,VON/OFF=0V
VIN=VOUT(S)+1V, 1.2V≤VOUT(S)<3.0V
f=1khz,
Ripple Rejection
|RR|
3.0V≤VOUT(S) ≤3.5V
△Vrip=0.5Vrms,
3.5V≤VOUT(S) ≤5.0V
IOUT=100mA
Ground Pin Current In Normal
Operation Mode
Ground Pin Current In
Power-off Mode
Thermal Shutdown detection
temperature
Thermal Shutdown release
temperature
MAX
6
VOUT(S)
+
0.015
VOUT(S)
x 1.01
UNIT
V
0.05
0.2
%/V
-3
20
mV
0.34
0.10
0.07
0.70
0.40
0.32
0.23
0.38
0.15
0.10
V
V
V
1000
mA
(Note 7)
ISS1
60
90
uA
0.1
1.0
uA
2
A
±100
ppm/°C
1.5
0.3
0.1
0.1
-0.1
-0.1
V
uA
uA
65
60
dB
55
TSD
Junction temperature
150
°C
TSR
Junction temperature
120
°C
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-20
1.2V≤VOUT(S)<1.5V
1.5V≤VOUT(S)<2.6V
2.6V≤VOUT(S) ≤5.0V
1.2V≤VOUT(S)<1.5V
1.5V≤VOUT(S)<2.0V
2.0V≤VOUT(S)<2.6V
2.6V≤VOUT(S) ≤5.0V
VIN≥VOUT(S)+1V
TYP
－
VOUT(S)
0.015
VOUT(S)
VOUT(S)
x 0.99
△VOUT1/
+0.5V≤VIN≤5.5V,IOUT=100mA
V
(△VIN×VOUT) OUT(S)
IOUT=300mA
Dropout Voltage(Note 4)
1.0V≤VOUT(S)<1.5V
MIN
1.5
VOUT(S)
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LR1801
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CMOS IC
ELECTRICAL CHARACTERISTICS (Cont.)
For LR1801-AD
PARAMETER
Input Voltage
Reference Voltage for
Adjustable Voltage Regulator
Output Voltage Range
Internal Resistance Value of
Adjust Pin
Output Voltage Line
Regulation
Output Voltage Load
Regulation
SYMBOL
VIN
VOUT
TEST CONDITIONS
VOUT=VADJ, VIN=2.0V, IOUT=100mA
RVOUT
MIN
1.5
TYP
MAX
6
UNIT
V
1.176
1.200
1.224
V
VIN
V
1.200
RIC
1
△VOUT1/
+0.5V≤VIN≤5.5V,IOUT=100mA
V
(△VIN×VOUT) OUT(S)
△VOUT2
VIN=VOUT(S)+1V,1mA≤IOUT≤300mA
Dropout Voltage(Note 4)
Vdrop
VOUT=VADJ
Output Current(Note 5)
IOUT
VIN≥VOUT(S)+1V
-20
IOUT=300mA
IOUT=1000mA
1000
(Note 7)
mΩ
0.05
0.2
%/V
-3
20
mV
0.34
0.70
0.38
V
mA
VIN=VOUT(S)+1V, ON/OFF pin=ON,
60
90
uA
No Load
VIN=VOUT(S)+1V, ON/OFF pin=OFF,
ISS2
0.1
1.0
uA
No Load
VIN=VOUT(S)+1V, ON/OFF pin=ON,
2
A
Short Circuit Current
ISC
VOUT=0V
△VOUT/ VIN=VOUT(S)+1V,IOUT=100mA,
Output Voltage Temperature
±100
ppm/°C
(△TA×VOUT) -40°C ≤ TA≤+85°C
Coefficient(Note 6)
VIN=VOUT(S)+1V, RL=1.0KΩ
1.5
V
ON/OFF Pin Input Voltage “H”
VSH
Determinied by VOUT output level
ON/OFF Pin Input Voltage “L”
VSL
0.3
ON/OFF Pin Input Current “H”
ISH
VIN=VOUT(S)+1V,VON/OFF=5.5V
-0.1
0.1
uA
ON/OFF Pin Input Current “L”
ISL
VIN=VOUT(S)+1V,VON/OFF=0V
-0.1
0.1
uA
VIN=VOUT(S)+1V,
1.2V≤VOUT(S)<3.0V
65
f=1khz,
dB
Ripple Rejection
|RR|
△Vrip=0.5Vrms,
3.0V≤VOUT(S) ≤3.5V
60
IOUT=100mA
Thermal Shutdown detection
TSD
Junction temperature
150
°C
temperature
Thermal Shutdown release
TSR
Junction temperature
120
°C
temperature
Notes: 1. The UTC LR1801 output must be diode-clamped to ground. If used in a dual-supply system where the
regulator load is returned to a negative supply.
2. Devices must be derated based on package thermal resistance at elevated temperatures.
3. VOUT(S): Specified output voltage
VOUT(E): Actual output voltage
Output voltage when fixing IOUT(=100ma) and inputting VOUT(S)+1.0V
4. Vdrop=VIN1-(VOUT3×0.98)
VOUT3 is the output voltage when VIN=VOUT(S)+1.0V and IOUT=300mA, 1000mA.
5. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the
output current.
6. The change in temperature [mV/°C] is calculated using the following equation.
VOUT
VOUT
mV / C   VOUT ( S ) V  
 ppm / C   1000
TA 
TA  VOUT 
Ground Pin Current In Normal
Operation Mode
Ground Pin Current In
Power-off Mode
ISS1
7. The output current can be at least this value.
Due to restrictions on the package power dissipation, this value may not be satisfied. Attention should be
paid to the power dissipation of the package when the output current is large.
This specification is guaranteed by design.
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LR1801

CMOS IC
TYPICAL APPLICATION CIRCUIT
Fixed Output Voltage
(1) ON/OFF pins must be pulled high through a 10kΩ pull-up resistor.
(2) Generally a series regulator may cause oscillation, depending on the selection of external parts. The following
conditions are recommended for this IC. However, be sure to perform sufficient evaluation under the actual
usage conditions for selection, including evaluation of temperature characteristics.
Input capacitor (CIN):
Output capacitor (CL):
2.2μF or more
2.2μF or more
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LR1801

CMOS IC
TYPICAL APPLICATION CIRCUIT (Cont.)
Adjustable Output Voltage
VOUT
I2
R2
ADJ
VOUT
IIC
RIC
R3
GND
I3
1.2V
The Output Voltage may be adjustable for any output voltage between its 1.2V reference and its VDD setting level.
An external pair of resistors is required, as shown above.
The complete equation for the output voltage is described step by step as follows;
I2 = IIC + I3
(1)
I3 =1.2 / R3
(2)
I2 = IIC + 1.2 / R3
(3)
Thus,
Therefore,
VOUT = 1.2 + R2 × I2
(4)
Put Equation (3) into Equation (4), then
VOUT =1.2 + R2 ( IIC + 1.2 / R3 )
=1.2 (1 + R2 / R3 ) + R2 × IIC (5)
In 2nd term, or R2×IIC will produce an error in VOUT.
In Equation (5),
IIC =1.2 / RIC
(6)
R2 × IIC = R2 ×1.2 / RIC
=1.2 × R2 / RIC
(7)
For better accuracy, choosing R2 (<<RIC) reduces this error.
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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