UNISONIC TECHNOLOGIES CO., LTD
LR18120
2A LOW DROPOUT REGULATOR
WITH ENABLE
DESCRIPTION
CMOS IC
The UTC
LR18120
is a positive voltage regulator with high
performance. It has low dropout voltage and low input voltage,
besides its output voltage can be fixed at 1.0V, 1.2V, 1.5V, 1.8V, or
2.5V depending on internal feedback resistors or ADJ (not connected
to the ground) with external feedback resistors. The input voltage of
UTC
LR18120
can be low to 1.4V. There are two additional pin in the
LR18120. One is EN pin and the other is POK pin.
The UTC
LR18120
is specially made for applications with low
input voltage, low dropout voltage, and low output voltage which is
almost the same as the input voltage. Typical applications include
motherboards, notebooks, set top boxes, network cards and
peripheral cards.
FEATURES
* V
IN
as Low as 1.4V and V
PP
Voltage 5V
* V
D
=320mV @ I
OUT
=2A, V
OUT
=1.2V
* Internal Over Current and Over Temperature Protection
* With Enable Pin
* Output Voltage: ±2%
* 1.0V, 1.2V, 1.5V, 1.8V and 2.5V Output Voltage
Adjustable Externally Using Resistors
* When Disable V
OUT
Pull Low Resistance
ORDERING INFORMATION
Ordering Number
LR18120xG-xx-S08-R
LR18120xG-xx-SH2-R
Package
SOP-8
HSOP-8
Packing
Tape Reel
Tape Reel
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Copyright © 2015 Unisonic Technologies Co., Ltd
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QW-R502-305.I
LR18120
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
10: 1.0V
12:1.2V
15:1.5V
18:1.8V
25:2.5V
MARKING
CMOS IC
SOP-8
HSOP-8
PIN CONFIGURATION
PIN DESCRIPTION
PIN NAME
POK
DESCRIPTION
This pin will Indicate high under this situation: V
O
reaches 92% of its rating voltage.
Open-drain output.
The enable control Input pin. As while as this pin’s voltage falls below 0.4V ,the
LR18120 will stop working. When there’s nothing connected with this pin, for active
High version, the device will be enabled, for active Low version，the device will be
shutdowned
The pin of input voltage.
Placing large capacitance closely to this pin is necessary. There should be
connected a 10µF ceramic capacitor.
This pin is for input voltage to control circuit.
Connected nothing.
The voltage output pin.
When this pin connected to the ground,V
OUT
will be set by the internal feedback
resistors. Otherwise, if using external feedback resistors to decide the V
OUT
, V
OUT
=
0.8(R1+R2)/R2 Volts.
Ground.
PIN NO.
1
2
V
EN
3
4
5
6
7
8
V
IN
V
PP
NC
V
OUT
ADJ
GND
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QW-R502-305.I
LR18120
BLOCK DIAGRAM
Enable Threshold Level High:
CMOS IC
+
-
+
-
Enable Threshold Level Low:
+
-
+
-
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LR18120
ABSOLUTE MAXIMUM RATING
PARAMETER
CMOS IC
UNIT
V
°C
°C
°C
SYMBOL
RATINGS
Input Voltage
V
PP
, V
IN
7
Power Dissipation
P
D
Internally limited
Junction Temperature
T
J
150
Ambient Operation Temperature
T
OPR
-40~ +85
Storage Temperature
T
STG
-65~ +150
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.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
V
IN
V
PP
T
OPR
SYMBOL
SOP-8
HSOP-8
SOP-8
HSOP-8
θ
JA
θ
JC
RATINGS
1.4 ~5.5
4.5~5.5
-40°C
≤T
OPR
≤
+85°C
RATINGS
150
143
20
14
UNIT
V
V
°C
UNIT
°C/W
°C/W
°C/W
°C/W
V
IN
Voltage
V
PP
Voltage
Ambient Operation Temperature
THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case
ELECTRICAL CHARACTERISTICS
UNIT
V
mA
V
mA
μA
V
%
V
PP
=5V, V
IN
=3.3V, V
EN
=V
PP
, I
OUT
=10mA, C
IN
=10µF, C
OUT
=10µF, T
A
=T
J
=25°C, unless otherwise specified.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
V
IN
Input Voltage Range
V
IN
1.4
5.5
Quiescent Current (Ground Current)
I
Q
V
OUT
=2.5V
1
2
V
PP
V
PP
Voltage Range
V
PP
4.5
5.5
I
PPH
V
OUT
=2.5V
0.23
0.5
V
PP
Current
I
PPL
V
EN
=0V
36
60
V
OUT
Output Voltage (Internal Fixed Voltage)
V
OUT
V
IN
= V
OUT
+0.5V, V
OUT
=2.5V
2.45
2.5
2.55
Line Regulation
∆V
OUT
∆V
IN
× V
OUT
V
IN
=( V
OUT
+0.5V) ~ 5V
0.2
1
Load Regulation
∆V
OUT
10mA≤I
OUT
≤2A
0.2
1
%
Dropout Voltage
V
D
I
OUT
=2A
300
420
mV
Short Circuit Current
1.4
A
V
OUT
Pull Low Resistance
V
EN
=0V
90
Ω
ADJ
Reference Voltage
V
REF
V
ADJ
= V
OUT
0.788 0.8 0.812
V
Adjust Pin Current
I
ADJ
20
100
nA
Adjust Pin Threshold
0.15
0.2
0.25
V
V
EN
V
EN
Pin Voltage High
V
H(EN)
1.6
V
V
EN
Pin Voltage Low
V
L(EN)
0.4
V
V
EN
Pin Bias Current
I
BIAS(EN)
V
EN
=0V
12
40
μA
POK
V
OUT
Power OK Voltage
V
THPOK
92
%
Hysteresis
V
HYPOK
7
%
OVER TEMPERATURE PROTECTION
Over Temperature
T
OT
150
°C
Over Temperature Hysteresis
T
OTHY
30
°C
Note: Low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
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www.unisonic.com.tw
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LR18120
TYPICAL APPLICATION CIRCUIT
CMOS IC
0.8(R1 + R2)
R2
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