Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1811
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CMOS IC
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR

DESCRIPTION
The UTC LR1811 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
LR1811 suitable for low voltage microprocessor application. The low
quiescent current operation and low dropout quality caused by the
CMOS process.
The UTC LR1811 has low dropout voltage. The ground pin
current is typically 80μA.
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 LR1811 are fixed one in the IC.

FEATURES
* Low Dropout Voltage
* The Guaranteed Output Current is 1A DC
* Output Voltage Accuracy ± 1.5%
* Over temperature Protection And Over current Protection

Note:
ORDERING INFORMATION
Ordering Number
LR1811G-xx-SH2-R
xx: Output Voltage, refer to Marking Information
Package
HSOP-8
Packing
Tape Reel
LR1811G-xx-SH2-R
(1)Packing Type
(1) R: Tape Reel
(2)Package Type
(2) SH2: HSOP-8
(3)Output Voltage
(3) xx: Refer to Marking Information
(4)Green Package
(4) G: Halogen Free and Lead Free
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CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
HSOP-8
12: 1.2V
15 : 1.5V
18: 1.8V
25: 2.5V
30: 3.0V
33: 3.3V
50: 5.0V
MARKING
PIN CONFIGURATION
VOUT
1
8
VIN
ON/ OFF
2
7
NC
NC
3
6
NC
GND
4
5
NC
GND

PIN DESCRIPTION
PIN NO.
1
PIN NAME
VOUT
2
ON /OFF
PIN DESCRIPTION
Output voltage
ON/OFF select pin, when connected to the ground the chip in operating normally.
3, 5,6,7
NC
No connection
4
GND
GND
8
VIN
Input voltage
Note: The NC pin is electrically open.
The NC pin can be connected to VIN or GND.
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CMOS IC
BLOCK DIAGRAM
Fixed Output Voltage
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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
θJA
θJC
RATINGS
143
45
UNIT
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (TJ=25°C, unless otherwise specified.)
PARAMETER
Input Voltage
Output Voltage (Note 3)
Output Voltage Line
Regulation
Output Voltage Load
Regulation
SYMBOL
VIN
VOUT(E)
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
ISS1
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TYP
MAX
6
VOUT(S)
VOUT(S) + 0.015
0.015
VOUT(S)
VOUT(S)
VOUT(S)
x 0.99
x 1.01
-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, 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
(△T
A×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
Ground Pin Current In Normal
Operation Mode
Ground Pin Current In
Power-off Mode
-
△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)
V
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
mA
80
120
μA
0.1
1.0
μA
2
A
±100
ppm/°C
1.5
-0.1
-0.1
V
0.05
1000
(Note
7)
50
UNIT
V
0.3
0.1
0.1
V
μA
μA
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CMOS IC
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
Ripple Rejection
SYMBOL
|RR|
TEST CONDITIONS
VIN=VOUT(S)+1V, 1.2V≤VOUT(S)<3.0V
f=1khz,
3.0V≤VOUT(S)≤3.5V
△Vrip=0.5Vrms,
3.5V≤VOUT(S)≤5.0V
IOUT=100mA
MIN
TYP
MAX
UNIT
65
60
dB
55
Thermal Shutdown detection
TSD
Junction temperature
150
°C
temperature
Thermal Shutdown release
TSR
Junction temperature
120
°C
temperature
Notes: 1. The UTC LR1811 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 
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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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): 2.2μF or more
Output capacitor (CL): 2.2μF or more
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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