LR1812G-12-AF5-R [UTC]
1.0A FAST ULTRA LOW DROPOUT LINEAR REGULATOR;
| 型号： | LR1812G-12-AF5-R |
| 厂家： | 
Unisonic Technologies |
| 描述： | 1.0A FAST ULTRA LOW DROPOUT LINEAR REGULATOR |
| 文件： | 总6页 (文件大小：243K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LR1812
CMOS IC
1.0A FAST ULTRA LOW
DROPOUT LINEAR
REGULATOR WITH REVERSE
CURRENT PROTECTION
DESCRIPTION
The UTC LR1812 operate from a +1.5V ~ +6V input supply as
fast ultra low-dropout linear regulators. Wide output voltage range
options are available. The fast response characteristic to make
UTC LR1812 suitable for low voltage microprocessor application.
The low quiescent current operation and low dropout quality
caused by the CMOS process.
The UTC LR1812 has low dropout voltage. The ground pin
current is typically 60uA.
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 and
load.
With the reverse current protection function of a driver
transistor, the reverse current flow is prohibited when VOUT
voltage is higher than VIN voltage. For an example, when a battery
is connected to the VOUT pin, battery current will not flow back to
the UTC LR1812
The output voltage types of UTC LR1812-xx are fixed one in
the IC.
FEATURES
* Low Dropout Voltage
* The Guaranteed Output Current is 1A DC
* Output Voltage Accuracy ± 1.5%
* Over temperature Protection And Over current Protection
* Reverse Current Protection
ORDERING INFORMATION
Ordering Number
LR1812G-xx-AF5-R
LR1812G-xx-SH2-R
Package
SOT-25
HSOP-8
Packing
Tape Ree
Tape Reel
Note: xx: Output Voltage, refer to Marking Information.
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LR1812
CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
SOT-25
12: 1.2V
15: 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
HSOP-8
PIN CONFIGURATION
VOUT
5
NC
4
VOUT
1
8
7
VIN
NC
ON/ OFF
NC
2
3
4
GND
6
5
NC
NC
GND
2
1
3
GND
VIN
ON/OFF
HSOP-8
SOT-25
PIN DESCRIPTION
PIN NO.
PIN NAME
PIN DESCRIPTION
HSOP-8
SOT-25
(Fixed)
1
5
VOUT
Output voltage
ON/OFF select pin, when connected to the ground the chip in
2
3
ON/OFF
operating normally.
No connection
GND
3, 5,6,7
4
2
1
NC
GND
VIN
4
8
Input voltage
Note: The NC pin is electrically open.
The NC pin can be connected to VIN or GND.
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LR1812
CMOS IC
BLOCK DIAGRAM
Fixed Output Voltage
Reverse
Current
Protection
VIN
VOUT
Current Limit
&
Thermal Shutdown
R1
R2
+
Error
Amp
-
each
circuit
ON/OFF
Control
VREF
ON/OFF
GND
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LR1812
CMOS IC
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VIN
RATINGS
UNIT
Input Voltage
7
-0.3~VIN
1
V
V
A
Shutdown Input Voltage
Maximum Operating Current (DC)
Power Dissipation (Note 3)
Junction Temperature
VIN(SHDN)
PD
TJ
Internally Limited
+125
°C
°C
Storage Temperature
TSTG
-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.
THERMAL DATA
PARAMETER
SYMBOL
RATINGS
143
UNIT
°C/W
°C/W
°C/W
°C/W
HSOP-8
SOT-25
HSOP-8
SOT-25
Junction to Ambient
Junction to Case
θJA
255
45
θJC
64
ELECTRICAL CHARACTERISTICS (TJ = 25°C, unless otherwise specified.)
For LR1812-xx
PARAMETER
SYMBOL
VIN
TEST CONDITIONS
MIN
1.5
TYP
MAX UNIT
Input Voltage
6
V
VOUT(S)
－
VOUT(S)
+
1.0V≤VOUT(S)<1.5V
VOUT(S)
V
VIN=VOUT(S)+1V
OUT=100mA
Output Voltage (Note 3)
VOUT(E)
0.015
VOUT(S)
x 0.99
0.015
VOUT(S)
x 1.01
I
1.5V≤VOUT(S) ≤3.5V
VOUT(S)
0.05
-3
V
△VOUT1
(△VIN×VOUT
/
Output Voltage Line
Regulation
VOUT(S)+0.5V≤VIN≤5.5V,IOUT=100mA
0.2
20
%/V
mV
)
Output Voltage Load
Regulation
△VOUT2
VIN=VOUT(S)+1V,1mA≤IOUT≤300mA
1.2V≤VOUT(S)<1.5V
-20
0.34
0.10
0.07
0.70
0.40
0.32
0.23
0.45
0.18
0.12
IOUT=300mA
1.5V≤VOUT(S)<2.6V
2.6V≤VOUT(S) ≤5.0V
1.2V≤VOUT(S)<1.5V
1.5V≤VOUT(S)<2.0V
2.0V≤VOUT(S)<2.6V
2.6V≤VOUT(S) ≤5.0V
Dropout Voltage(Note 4)
Output Current(Note 5)
Vdrop
V
I
OUT=1000mA
1000
(Note
7)
IOUT
VIN≥VOUT(S)+1V
mA
Ground Pin Current In Normal
Operation Mode
VIN=VOUT(S)+1V, ON/OFF pin=ON, No
Load
ISS1
ISS2
ISC
50
60
0.3
110
1.0
uA
uA
Ground Pin Current In
Power-off Mode
VIN=VOUT(S)+1V, ON/OFF pin=OFF,
No Load
VIN=VOUT(S)+1V, ON/OFF pin=ON,
Short Circuit Current
0.5
A
VOUT=0V
△VOUT
(△TA×VOUT
/
Output Voltage Temperature
Coefficient(Note 6)
VIN=VOUT(S)+1V,IOUT=100mA,
-40°C ≤ TA≤+85°C
±100
ppm/°C
)
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LR1812
CMOS IC
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SYMBOL
VSH
TEST CONDITIONS
VIN=VOUT(S)+1V, RL=1.0KΩ
Determinied by VOUT output level
MIN
1.5
TYP
MAX UNIT
ON/OFF Pin Input Voltage “H”
ON/OFF Pin Input Voltage “L”
ON/OFF Pin Input Current “H”
ON/OFF Pin Input Current “L”
Reverse Current(Note 8)
VOUT Pin Sink Current
V
VSL
0.3
ISH
VIN=VOUT(S)+1V,VON/OFF=5.5V
VIN=VOUT(S)+1V,VON/OFF=0V
VIN=0V, VOUT= 6.0V
-0.1
-0.1
0.1
0.1
1.5
uA
uA
uA
ISL
IREV
0.1
0.1
IREVS
|RR|
VIN=5.0V, VOUT=6.0V
1.5
uA
(Note 9)
VIN=VOUT(S)+1V,
f=1khz,
△Vrip=0.5Vrms,
1.2V≤VOUT(S)<3.0V
3.0V≤VOUT(S) ≤3.5V
3.5V≤VOUT(S) ≤5.0V
65
60
55
Ripple Rejection
dB
IOUT=100mA
Thermal Shutdown detection
temperature
TSD
TSR
Junction temperature
Junction temperature
150
120
°C
°C
Thermal Shutdown release
temperature
Notes: 1. The UTC LR1812 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. Devices must be derated based on package thermal resistance at elevated temperatures.
3. VOUT(S): Specified output voltage
V
OUT(E): Actual output voltage
Output voltage when fixing IOUT(=100ma) and inputting VOUT(S)+1.0V
4. Vdrop=VIN1-(VOUT3×0.98)
VOUT3 is the output voltage when VIN=VOUT(S)+1.0V and IOUT=300mA, 1000mA.
5. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the
output current.
6. The change in temperature [mV/°C] is calculated using the following equation.
VOUT
TA
VOUT
TA VOUT
mV /C V
V
OUT (S)
ppm / C 1000
7. 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.
8. Reverse current (IREV) flows from VOUT to VIN.
9. VOUT pin sink current (IREVS) flows from VOUT to GND.
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LR1812
CMOS IC
TYPICAL APPLICATION CIRCUIT
Fixed Output Voltage
(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 (CIN):
Output capacitor (CL):
2.2μF or more
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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