Datasheet

UNISONIC TECHNOLOGIES CO., LTD
LR1108/E
CMOS IC
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR

DESCRIPTION
The UTC LR1108/E 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/E suitable for low voltage microprocessor
application. The low quiescent current operation and low dropout
quality caused by the CMOS process.
The UTC LR1108/E has ultra low dropout voltage
300mV at 1A load current typically.
The ground pin current is typically 70uA at 1mA load current.
ERROR Flag: When the output voltage drops 10% below nominal
value Error flag goes low.
SET/ADJ Mode (for LR1108): Connect an external resistive voltage-divider from VOUT to this pin to set the
output voltage from 1.145V to 5V.
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
* Sense option improves better load regulation
* Low Output Capacitor Required
* Over temperature Protection And Over current
Protection
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LR1108G-xx-AA3--R
LR1108G-xx-AB3--R
LR1108G-xx-AE3--R
LR1108L-xx-TN3--R
LR1108G-xx-TN3--R
Package
Pin Assignment

Packing
SOT-223
SOT-89
SOT-23
TO-252
A: GOI
B: OGI
C: GIO
D: IGO
Tape Reel
-
LR1108G-xx-AF5-R
SOT-25
I
G
SD
S
O
Tape Reel
-
LR1108EG-xx-AF5-R
SOT-25
I
G
SD
E
O
Tape Reel
Note: Pin Assignment: I:VIN O:VOUT G:GND
SD: SD
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Copyright © 2015 Unisonic Technologies Co., Ltd
E: ERROR S:SET/ADJ
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LR1108/E

CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
SOT-223
SOT-89
12: 1.2V
15: 1.5V
18: 1.8V
25: 2.5V
2J: 2.85V
33: 3.3V
50: 5.0V
SOT-23
SOT-25
(LR1108E)
SPXXG
Voltage Code
SOT-25
(LR1108)
TO-252

PIN DESCRIPTION
For SOT-23/SOT-223/SOT-89/TO-252 Package
PIN CODE & NO
PIN NAME
I/O
A
B
C
D
2
1
3
3
VOUT
O
1
2
1
2
GND
3
3
2
1
VIN
For SOT-25 Package
PIN NO
PIN NAME
1
VIN
2
GND
DESCRIPTION
Output Voltage
Ground
Input Supply
I/O
DESCRIPTION
Input supply
Ground
Shutdown LR1108/E enable; when the SD pin connects to GND will
3
4
5
SD
I
ERROR
(For LR1108E)
O
SET/ADJ
(For LR1108)
VOUT
O
O
shutdown the LR1108/E; At normal operation, SD must be tied to VDD
through a 10KΩ pull up resistor.
ERROR flag, active low; when the output dropout of regulation due to low
input voltage, the LR1108E produces a logic low signal at the ERROR pin.
Voltage-Setting Input. Connect an external resistive voltage-divider from
VOUT to this pin to set the output voltage.
Output voltage
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LR1108/E

CMOS IC
BLOCK DIAGRAM
VIN
SD
VOUT
ERROR
GND
LR1108E
VIN
SD
VOUT
SET/ADJ
80mV
GND
LR1108
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LR1108/E

CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Voltage (Operating) (Note 10)
Input Voltage (Survival)
Shutdown Input Voltage
Output Voltage (Survival), (Note 4, 5)
IOUT (Survival)
SYMBOL
VIN
VIN(SHDN)
VOUT
Maximum Voltage for ERROR Pin
RATINGS
2.5~7.0
-0.3~+7.5
-0.3~VIN+0.3
-0.3~+7.5
Short Circuit Protected
UNIT
V
V
V
V
VIN+0.3
V
Maximum Operating Current (DC)
1
A
Power Dissipation (Note 2)
PD
Internally Limited
Junction Temperature
TJ
+125
°C
Operating Temperature
TOPR
-40~+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
SOT-23
SOT-25
TO-252
SOT-223
SOT-89
SOT-23
SOT-25
TO-252
θJA
θJC
RATINGS
165
179
325
260
112
15
47
130
110
12
UNIT
°C/W
°C/W
ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature
range. (TJ = 25°C, VIN = VO(NOM) + 1V, IL = 10mA, COUT = 2.2μF, VSD = VIN-0.3V, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
+1.5
0mA ≤ IL ≤ 1A
-1.5
%
0
Output Voltage Tolerance (Note 6)
VOUT
+3
VOUT +1 ≤ VIN≤ 7.0V
-3
Output Voltage Line Regulation (Note 6)
△VOUT
VOUT+1V<VIN<7.0V
0.5
%
Output Voltage Load Regulation (Note 6) △VOUT/△IOUT 10mA < IL < 1A
0.65
%
Dropout Voltage (Note 8)
VD
IL = 1A
300
500
mV
Ground Pin Current In Normal Operation
IL = 0mA
70
100
IGND
uA
Mode
IL = 1A
300
Peak Output Current
IO(PEAK)
(Note 2)
1
A
SHORT CIRCUIT PROTECTION
Short Circuit Current
ISC
2
A
OVER TEMPERATURE PROTECTION
Shutdown Threshold
TSHDN(THR)
165
°C
Thermal Shutdown Hysteresis
TSHDN(HYS)
10
°C
SHUTDOWN INPUT
Output = High
VIN-0.3
VIN
Shutdown Threshold
VSHDN
V
Output = Low
0
0.2
Turn-off Delay
tD(OFF)
IL = 1A
20
μs
Turn-on Delay
tD(ON)
IL = 1A
25
μs
SD Input Current
ISD
VSD = VIN
1
nA
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LR1108/E

CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL
ERROR FLAG COMPARATOR (LR1108E)
ERROR Flag Saturation
VEF(SAT)
ERROR Flag Pin Leakage Current
II(LEAK)
Threshold
Threshold Hysteresis
Flag Reset Delay
SET/ADJ Mode (LR1108 5pins)
VT
VTHR
tD
SET Voltage
VSET
TEST CONDITIONS
MIN
ISINK = 100μA
TYP
MAX
UNIT
0.02
0.1
V
1
(Note 7)
(Note 7)
Measured on ADJ,
VIN=2.8V, IOUT =10mA
nA
5
2
10
5
1
16
8
%
%
μs
0.784
0.8
0.816
V
AC PARAMETERS
VIN = VOUT + 1.5V
60
COUT=100uF, VOUT = 3.3V
dB
Ripple Rejection
PSRR
VIN = VOUT + 0.3V
40
COUT=100uF, VOUT = 3.3V
Output Noise Density
ρN(L/F)
f = 120Hz
0.8
μV
BW = 10Hz ~ 100kHz
150
Output Noise Voltage
eN
μVRMS
BW = 300Hz ~ 300kHz
100
Notes: 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/E 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 VIN and VOUT 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 ≤ TJ ≤ +85°Ccause under shutdown conditions the temperature rise
of the device is negligible.
10. The minimum operating VIN value is equal to [VOUT(NOM) + VDROPOUT] or 2.5V, just the greater.
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LR1108/E

CMOS IC
TYPICAL APPLICATION CIRCUIT
INPUT
3.3V±10%
VIN
VOUT
2.5V, 500mA
VOUT
UTC LR1108
CIN
1µF
SD*
SD
ERROR
ERROR (Note)
COUT
4.7µF
GND
Note: SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this
function is not used.
Note: SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to
ground if this function is not used
Note: SD pins must be pulled high through a 10kΩ pull-up resistor.
Connect the SET/ADJ pin to ground if this function is not used.
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LR1108/E
CMOS IC
TYPICAL CHARACTERISTICS
Dropout Voltage, VD (mV)

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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