LR1108-XX-AB3-C-R [UTC]
1A FAST ULTRA LOW DROPOUT LINEAR REGULATOR; FAST 1A超低压差线性稳压器
| 型号： | LR1108-XX-AB3-C-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | 1A FAST ULTRA LOW DROPOUT LINEAR REGULATOR |
| 文件： | 总6页 (文件大小：142K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LR1108
CMOS IC
1A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR
1
1
SOT-89
DESCRIPTION
2
3
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.
5
4
SOT-25
The UTC LR1108 has ultra low dropout voltage; 300mV at
600mA load current typically.
*Pb-free plating product number: LR1108L
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
* Overtemperature protection and overcurrent protection
ORDERING INFORMATION
Ordering Number
Pin Assignment
Packing
Package
Normal
Lead Free Plating
1
G
G
I
2
O
I
3
I
4
-
5
-
LR1108-xx-AB3-A-R
LR1108-xx-AB3-C-R
LR1108-xx-AF5-R
LR1108L-xx-AB3-A-R
LR1108L-xx-AB3-C-R
LR1108L-xx-AF5-R
SOT-89
SOT-89
SOT-25
Tape Reel
Tape Reel
Tape Reel
O
-
-
G
SD ERROR
O
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Copyright © 2007 Unisonic Technologies Co., Ltd
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LR1108
CMOS IC
MARKING INFORMATION
VOLTAGE
CODE
PACKAGE
PIN CODE PIN 1 PIN 2 PIN 3 PIN 4 PIN 5
MARKING
A
C
GND
GND
VOUT
VIN
-
-
-
-
SOT-89
SOT-25
15 :1.5V
18:1.8V
25:2.5V
2J:2.85V
33:3.3V
VIN
VOUT
3
2
1
SPXX
4
-
VIN
GND
VOUT
SD
ERROR
Lead Plating
5
PIN DESCRIPTION
Pin Description for SOT-89 Package
PIN CODE & NO.
PIN NAME I/O
DESCRIPTION
A
2
1
3
C
3
1
2
VOUT
GND
VIN
O
Output Voltage
Ground
Input Supply
Pin Description for SOT-25 Package
PIN NO. PIN NAME
I/O
DESCRIPTION
1
2
VIN
Input supply
Ground
GND
Shutdown LR1108 enable; when the SD pin connects to GND will shutdown the
LR1108; At normal operation, SD must be tied to VDD through a 10KΩ pull up
resistor.
3
SD
I
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
4
5
O
O
ERROR
VOUT
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LR1108
CMOS IC
BLOCK DIAGRAM
VIN
SD
VOUT
ERROR
GND
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LR1108
CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VIN
RATINGS
2.5~7.0
UNIT
Input Voltage (Operating), (Note 10)
Input Voltage (Survival)
V
V
V
V
-0.3~+7.5
-0.3~VIN+0.3
-0.3~+7.5
Shutdown Input Voltage
VIN(SHDN)
VOUT
Output Voltage (Survival), (Note 4), (Note 5)
IOUT (Survival)
Short Circuit Protected
VIN+0.3
Maximum Voltage for ERROR Pin
Maximum Operating Current (DC)
Power Dissipation (Note 2)
Junction Temperature
V
A
1
PD
TJ
Internally Limited
+125
℃
℃
℃
Operating Temperature
TOPR
TSTG
-40~+125
-65~+150
Storage Temperature
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.
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℃, VIN = VO(NOM) + 1V, IL = 10 mA, COUT = 2.2µF, VSD = VIN-0.3V, unless otherwise specified.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
-1.5
-3
TYP
MAX
+1.5
+3
UNIT
%
0 mA ≤ IL ≤ 1A
OUT +1 ≤ VIN≤ 7.0V
Output Voltage Tolerance (Note 6)
Output Voltage Line Regulation (Note 6)
VOUT
0
V
△VOUT
VOUT+1V<VIN<7.0V
0.05
0.04
300
200
300
800
%
%
Output Voltage Load Regulation (Note 6) △VOUT/△IOUT 10 mA < IL < 1A
Dropout Voltage (Note 8)
Ground Pin Current In Normal Operation
Mode
VD
IL = 1A
500
mV
IL = 0 mA
IL = 1A
IGND
uA
Peak Output Current
IO(PEAK)
(Note 2)
600
mA
SHORT CIRCUIT PROTECTION
Short Circuit Current
ISC
2
A
OVER TEMPERATURE PROTECTION
Shutdown Threshold
TSHDN(THR)
TSHDN(HYS)
165
10
℃
℃
Thermal Shutdown Hysteresis
SHUTDOWN INPUT
Output = High
Output = Low
IL = 1A
VIN-0.3
VIN
0
Shutdown Threshold
VSHDN
V
0.2
0.1
Turn-off Delay
tD(OFF)
tD(ON)
ISD
20
25
1
µs
µs
nA
Turn-on Delay
IL = 1A
SD Input Current
VSD = VIN
ERROR FLAG COMPARATOR
ERROR Flag Saturation
ERROR Flag Pin Leakage Current
Threshold
VEF(SAT)
II(LEAK)
VT
ISINK = 100µA
0.02
1
V
nA
%
(Note 7)
(Note 7)
5
2
10
5
16
8
Threshold Hysteresis
Flag Reset Delay
VTHR
tD
%
1
µs
AC PARAMETERS
VIN = VOUT + 1.5V
60
40
C
OUT=100uF, VOUT = 3.3V
VIN = VOUT + 0.3V
OUT=100uF, VOUT = 3.3V
Ripple Rejection
PSRR
dB
C
Output Noise Density
Output Noise Voltage
ρn(l/f)
f = 120Hz
0.8
150
100
µV
BW = 10Hz – 100kHz
BW = 300Hz – 300kHz
eN
µVrms
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LR1108
CMOS IC
ELECTRICAL CHARACTERISTICS(Cont.)
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℃.
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 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℃ ≤ TJ ≤ 85℃cause 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
CMOS IC
TYPICAL APPLICATION CIRCUIT
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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