UNISONIC TECHNOLOGIES CO., LTD
LR1801
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR
DESCRIPTION
Preliminary
CMOS IC
The UTC
LR1801
operate from a +2V ~ +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 ultra low dropout voltage
300mV at 1A load current typically. The ground pin current is
typically 60uA at 1mA load current.
Output Voltage Precision: Multiple output voltage options are
available and ranging from 1.2V ~ 3.5V at room temperature with a
guaranteed accuracy of ±1.5%, and ±3.0% when varying line, load
and temperature.
FEATURES
* Ultra Low Dropout Voltage
* Low Ground Pin Current
* The Guaranteed Output Current is 1A DC
* Output Voltage Accuracy ± 1.5%
* Over temperature Protection And Over current Protection
ORDERING INFORMATION
Ordering Number
Lead Free
LR1801L-xx-SH2-T
LR1801L-xx-SH2-R
Halogen Free
LR1801G-xx-SH2-T
LR1801G-xx-SH2-R
Package
HSOP-8
HSOP-8
Packing
Tube
Tape Reel
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LR1801
MARKING INFORMATION
VOLTAGE CODE
12: 1.2V
15 : 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
PACKAGE
Preliminary
MARKING
CMOS IC
HSOP-8
PIN CONFIGURATION
V
OUT
ON/ OFF
NC
GND
1
2
8
7
V
IN
NC
NC
NC
GND
3
4
6
5
PIN DESCRIPTION
PIN NO.
1
2
PIN NAME
V
OUT
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
V
IN
Input voltage
Note: The NC pin is electrically open.
The NC pin can be connected to V
IN
or GND.
BLOCK DIAGRAM
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LR1801
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Preliminary
CMOS IC
RATINGS
UNIT
Input Voltage
7
V
Shutdown Input Voltage
-0.3~V
IN
V
Maximum Operating Current (DC)
1
A
Power Dissipation (Note 3)
P
D
Internally Limited
Junction Temperature
T
J
+125
°C
Storage Temperature
T
STG
-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.
SYMBOL
V
IN
V
IN(SHDN)
THERMAL DATA
SYMBOL
θ
JA
θ
JC
RATINGS
143
45
UNIT
°C/W
°C/W
PARAMETER
Junction to Ambient
Junction to Case
ELECTRICAL CHARACTERISTICS
(T
J
= 25°C, unless otherwise specified.)
SYMBOL
V
IN
TEST CONDITIONS
MIN
2
TYP
MAX
6
V
OUT(S)
+
0.015
V
OUT(S)
x 1.01
0.2
20
0.38
0.15
0.10
V
UNIT
V
V
V
%/V
mV
PARAMETER
Input Voltage
Output Voltage (Note 4)
V
OUT(E)
V
IN
=V
OUT(S)
+1V
I
OUT
=100mA
1.0V≤V
OUT(S)
<1.5V
1.5V≤V
OUT(S)
≤3.5V
V
OUT(S)
-
V
OUT(S)
0.015
V
OUT(S)
V
OUT(S)
x 0.99
0.05
-20
-3
0.34
0.10
0.07
0.70
0.40
0.32
0.23
1000
(Note 8)
Output Voltage Line
Regulation
Output Voltage Load
Regulation
△
V
OUT1
/
V
OUT(S)
+0.5V≤V
IN
≤5.5V,I
OUT
=100mA
(
△
V
IN
×V
OUT
)
△
V
OUT2
V
IN
=V
OUT(S)
+1V,1mA≤I
OUT
≤300mA
I
OUT
=300mA
1.2V≤V
OUT(S)
<1.5V
1.5V≤V
OUT(S)
<2.6V
2.6V≤V
OUT(S)
≤3.5V
1.2V≤V
OUT(S)
<1.5V
1.5V≤V
OUT(S)
<2.0V
2.0V≤V
OUT(S)
<2.6V
2.6V≤V
OUT(S)
≤3.5V
Dropout Voltage(Note 5)
V
drop
I
OUT
=1000mA
Output Current(Note 6)
Ground Pin Current In Normal
Operation Mode
Ground Pin Current In
Power-off Mode
I
OUT
I
SS1
V
IN
≥V
OUT(S)
+1V
mA
60
0.1
200
±100
90
1.0
uA
uA
mA
ppm/°C
0.3
V
V
IN
=V
OUT(S)
+1V, ON/OFF pin=ON, No
Load
V
IN
=V
OUT(S)
+1V, ON/OFF pin=OFF,
I
SS2
No Load
V
IN
=V
OUT(S)
+1V, ON/OFF pin=ON,
Short Circuit Current
I
SC
V
OUT
=0V
Output Voltage Temperature
△
V
OUT
/ V
IN
=V
OUT(S)
+1V,I
OUT
=100mA,
Coefficient(Note 7)
(
△
T
A
×V
OUT
) -40°C
≤
T
A
≤+85°C
ON/OFF Pin Input Voltage “H”
V
SH
V
IN
=V
OUT(S)
+1V, R
L
=1.0KΩ
Determinied by V
OUT
output level
ON/OFF Pin Input Voltage “L”
V
SL
1.0
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PARAMETER
ON/OFF Pin Input Current “H”
ON/OFF Pin Input Current “L”
Ripple Rejection
SYMBOL
I
SH
I
SL
|RR|
Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS (Cont.)
TEST CONDITIONS
V
IN
=V
OUT(S)
+1V,V
ON/OFF
=5.5V
V
IN
=V
OUT(S)
+1V,V
ON/OFF
=0V
V
IN
=V
OUT(S)
+1V, 1.2V≤V
OUT(S)
<3.0V
f=1khz,
△V
rip
=0.5Vrms, 3.0V≤V
OUT(S)
≤3.5V
I
OUT
=100mA
MIN
-0.1
-0.1
TYP
MAX
0.1
0.1
UNIT
uA
uA
dB
65
60
Thermal Shutdown detection
T
SD
Junction temperature
150
°C
temperature
Thermal Shutdown release
T
SR
Junction temperature
120
°C
temperature
Notes: 1. The
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. Between the V
IN
and V
OUT
terminals the output PMOS structure contains a diode. This diode is reverse
biased normally. If the voltage at the output terminal is forced to be higher than the voltage at the input
terminal this diode will get forward biased. This diode can withstand 1Amp of peak current and 200mA of
DC current typically.
3. Devices must be derated based on package thermal resistance at elevated temperatures.
4. V
OUT(S)
: Specified output voltage
V
OUT(E)
: Actual output voltage
Output voltage when fixing I
OUT
(=100ma) and inputting V
OUT(S)
+1.0V
5. Vdrop=V
IN1
-(V
OUT3
×0.98)
V
OUT3
is the output voltage when V
IN
=V
OUT(S)
+1.0V and I
OUT
=300mA, 1000mA.
6. The output current at which the output voltage becomes 95% of V
OUT(E)
after gradually increasing the
output current.
7.The change in temperature [mV/°C] is calculated using the following equation.
V
OUT
V
OUT
mV
/
C
½
V
OUT
(
S
)
V
ppm
/
C
1000
T
V
T
A
A
OUT
8.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
TYPICAL APPLICATION CIRCUIT
Preliminary
CMOS IC
(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 (C
IN
): 2.2μF or more
Output capacitor (C
L
): 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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