UNISONIC TECHNOLOGIES CO., LTD
LR1108
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR
DESCRIPTION
CMOS IC
The UTC
LR1108
operate from a +2.5V ~ +7.0V input supply
as fast ultra low-dropout linear regulators. Wide output voltage
range options are available. The fast response characteristic to
make UTC
LR1108
suitable for low voltage microprocessor
application. The low quiescent current operation and low dropout
quality caused by the CMOS process.
The UTC
LR1108
has ultra low dropout voltage
300mV at 1A load current typically.
The ground pin current is typically 200uA at 1mA load current.
ERROR Flag: When the output voltage drops 10% below
nominal value Error flag goes low.
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,
load and temperature.
FEATURES
* Ultra Low Dropout Voltage
* Low Ground Pin Current
* 0.04% Load Regulation
* The Guaranteed Output Current is 1A DC
* Output Voltage Accuracy ± 1.5%
* ERROR Flag Indicates Output Status
* Low Output Capacitor Required
* Over temperature Protection And Over current Protection
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LR1108L-xx-AA3--R
LR1108G-xx-AA3--R
LR1108L-xx-AB3--R
LR1108G-xx-AB3--R
LR1108L-xx-TN3--R
LR1108G-xx-TN3--R
LR1108L-xx-AF5-R
LR1108G-xx-AF5-R
Package
SOT-223
SOT-89
TO-252
SOT-25
Pin Assignment
A: GOI
C: GIO
D: IGO
I
G
SD
ERROR
Packing
Tape Reel
O
www.unisonic.com.tw
Copyright © 2013 Unisonic Technologies Co., Ltd
1 of 7
QW-R102-031.M
LR1108
MARKING INFORMATION
VOLTAGE CODE
MARKING
PACKAGE
CMOS IC
SOT-223
5
SOT-25
SPXX
1
2
4
G: Halogen Free
L : Lead Free
3
TO-252
15 : 1.5V
18: 1.8V
25: 2.5V
2J: 2.85V
33: 3.3V
50: 5.0V
SOT-89
PIN DESCRIPTION
I/O
O
DESCRIPTION
Output Voltage
Ground
Input Supply
For SOT-223/SOT-89/TO-252 Package
PIN CODE & NO
PIN NAME
A
C
D
2
3
3
V
OUT
1
1
2
GND
3
2
1
V
IN
For SOT-25 Package
PIN NO PIN NAME
1
V
IN
2
GND
3
4
5
SD
ERROR
V
OUT
I/O
DESCRIPTION
Input supply
Ground
Shutdown LR1108 enable; when the SD pin connects to GND will shutdown the
LR1108; At normal operation, SD must be tied to V
DD
through a 10KΩ pull up
resistor.
Error flag, active low; when the output dropout of regulation due to low input
voltage, the LR1108 produces a logic low signal at the ERROR pin.
Output voltage
I
O
O
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R102-031.M
LR1108
BLOCK DIAGRAM
CMOS IC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 7
QW-R102-031.M
LR1108
ABSOLUTE MAXIMUM RATINGS
CMOS IC
PARAMETER
SYMBOL
RATINGS
UNIT
2.5~7.0
V
Input Voltage (Operating) (Note 10)
V
IN
Input Voltage (Survival)
-0.3~+7.5
V
Shutdown Input Voltage
V
IN(SHDN)
-0.3~V
IN
+0.3
V
Output Voltage (Survival), (Note 4, 5)
V
OUT
-0.3~+7.5
V
I
OUT
(Survival)
Short Circuit Protected
Maximum Voltage for ERROR Pin
V
IN
+0.3
V
Maximum Operating Current (DC)
1
A
Power Dissipation (Note 2)
P
D
Internally Limited
Junction Temperature
T
J
+125
°C
Operating Temperature
T
OPR
-40~+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.
THERMAL DATA
PARAMETER
SYMBOL
SOT-223
SOT-25
TO-252
SOT-89
SOT-223
SOT-25
TO-252
SOT-89
θ
JA
RATINGS
165
249
112
179
15
165
12
47
UNIT
°C/W
Junction to Ambient
Junction to Case
θ
JC
°C/W
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
J
= 25°C, and limits in
boldface type
apply over the full operating temperature
range. (T
J
= 25°C, V
IN
= V
O(NOM)
+ 1V, I
L
= 10mA, C
OUT
= 2.2μF, V
SD
= V
IN
-0.3V, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
+1.5
0mA
≤
I
L
≤
1A
-1.5
%
0
Output Voltage Tolerance (Note 6)
V
OUT
+3
V
OUT
+1
≤
V
IN
≤
7.0V
-3
Output Voltage Line Regulation (Note 6)
△
V
OUT
V
OUT
+1V<V
IN
<7.0V
0.5
%
Output Voltage Load Regulation (Note 6)
△
V
OUT
/
△
I
OUT
10mA < I
L
< 1A
0.65
%
Dropout Voltage (Note 8)
V
D
I
L
= 1A
300
500
mV
I
L
= 0mA
200
Ground Pin Current In Normal Operation
I
GND
uA
Mode
I
L
= 1A
300
Peak Output Current
I
O(PEAK)
(Note 2)
1
A
SHORT CIRCUIT PROTECTION
Short Circuit Current
I
SC
2
A
OVER TEMPERATURE PROTECTION
Shutdown Threshold
T
SHDN(THR)
165
°C
Thermal Shutdown Hysteresis
T
SHDN(HYS)
10
°C
SHUTDOWN INPUT
Output = High
V
IN
-0.3
V
IN
Shutdown Threshold
V
SHDN
V
Output = Low
0
0.2
Turn-off Delay
t
D(OFF)
I
L
= 1A
20
μs
Turn-on Delay
t
D(ON)
I
L
= 1A
25
μs
SD Input Current
I
SD
V
SD
= V
IN
1
nA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 7
QW-R102-031.M
LR1108
ELECTRICAL CHARACTERISTICS(Cont.)
SYMBOL
V
EF(SAT)
I
I(LEAK)
V
T
V
THR
t
D
TEST CONDITIONS
I
SINK
= 100μA
(Note 7)
(Note 7)
5
2
MIN
TYP
0.02
1
10
5
1
PARAMETER
ERROR FLAG COMPARATOR
ERROR Flag Saturation
ERROR Flag Pin Leakage Current
Threshold
Threshold Hysteresis
Flag Reset Delay
AC PARAMETERS
CMOS IC
MAX
0.1
16
8
UNIT
V
nA
%
%
μs
V
IN
= V
OUT
+ 1.5V
60
C
OUT
=100uF, V
OUT
= 3.3V
dB
Ripple Rejection
PSRR
V
IN
= V
OUT
+ 0.3V
40
C
OUT
=100uF, V
OUT
= 3.3V
Output Noise Density
ρ
N(L/F)
f = 120Hz
0.8
μV
BW = 10Hz ~ 100kHz
150
Output Noise Voltage
e
N
μV
RMS
BW = 300Hz ~ 300kHz
100
Note 1. Conditions for which the device is intended to be functional is indicated by operating ratings, but specific
performance limits isn’t be guaranteed. To make sure of specifications and test conditions, read Electrical
Characteristics. Only for the test conditions listed the guaranteed specifications can be applied. When the
device is not operated under the listed test conditions some performance characteristics may degrade.
2. Devices must be derated based on package thermal resistance at elevated temperatures.
3. The most likely parametric norm represents at 25°C.
4. The
LR1108
output must be diode-clamped to ground. If used in a dual-supply system where the regulator
load is returned to a negative supply.
5. 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.
6. Output voltage line regulation is the change in output voltage from the nominal value which is due to change
in the input line voltage. Which is defined as the change in output voltage from the nominal value due to
change in load current is output voltage load regulation. The load regulation and line regulation specification
include the typical number only. But, the limits for load and line regulation are included in the output voltage
tolerance specification.
7. Error Flag hysteresis and threshold are specified as regulated output voltage’s percentage.
8. At which the output drops 2% below the normal value dropout voltage is defined as the minimum input to
output differential voltage. Only to output voltages of 2.5V and above dropout voltage specification applies.
For output voltages below 2.5V, since the minimum input voltage is 2.5V, the drop-out voltage is nothing but
the input to output differential.
9. Specification has been tested at -40°C
≤
T
J
≤
+85°Ccause under shutdown conditions the temperature rise
of the device is negligible.
10. The minimum operating V
IN
value is equal to [V
OUT(NOM)
+ V
DROPOUT
] or 2.5V, just the greater.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R102-031.M
京公网安备 11010802033920号
EEWORLD
