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UNISONIC TECHNOLOGIES CO., LTD
L11831A/B
Preliminary
MAXIMUM 3A, ULTRA LOW
DROPOUT REGULATOR WITH
ENABLE
DESCRIPTION
The UTC L11831A/B 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 1V,1.05V, 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 L11831A/B can be low to 1.4V. There are two
additional pin in the UTC L11831A/B. One is EN pin and the other
is POK pin.
The UTC L11831A/B 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
* VIN as low as 1.4V and VDD voltage 5V
* Maximum 3A low-dropout voltage regulator
* High accuracy output voltage ±1.5%
* When disable VO pull low resistance
* Internal over current and over temperature protection
ORDERING INFORMATION
Ordering Number
L11831AG-xx-SH2-R
L11831BG-xx-SH2-R
Note: xx: Output Voltage, refer to Marking Information.
Package
HSOP-8
HSOP-8
CMOS IC
Packing
Tape Reel
Tape Reel
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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L11831A/B
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
HSOP-8
12: 1.2v
15 : 1.5V
18: 1.8V
25: 2.5V
Preliminary
MARKING
PIN CONFIGURATION
POK 1
EN 2
VIN 3
VDD 4
GND
8 GND
7 ADJ
6 VOUT
5 NC
CMOS IC
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8
PIN NAME
POK
EN
VIN
VDD
NC
VOUT
ADJ
GND
DESCRIPTION
This pin will indicate high under this situation: VO reaches 90% of its rating voltage.
Open-drain output.
Chip enable (active-high) / (active-low)
The pin of input voltage.
This pin is for input voltage to control circuit.
No internal connection
Output voltage
When this pin connected to the ground, VOUT will be set by the internal feedback
resistors. Otherwise, if using external feedback resistors to decide the VOUT, VOUT =
0.8(R1+R2)/R2 Volts.
Ground.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L11831A/B
BLOCK DIAGRAM
Preliminary
CMOS IC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L11831A/B
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
VDD, VIN
6
V
Power Dissipation
PD Internally limited
Junction Temperature
TJ 150 °C
Operation Temperature
TOPR
-40~+85
°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.
RECOMMENDED OPERATING CONDITIONS (Note 1)
PARAMETER
Supply Voltage
Control Voltage (VDDVOUT+1.5V)
Junction Temperature Range
Ambient Temperature Range
THERMAL DATA
SYMBOL
VIN
VDD
TJ
TA
RATINGS
1.4~5.5
3~5.5
-40~125
-40~85
UNIT
V
V
°C
°C
PARAMETER
Junction to Ambient
Junction to Case
SYMBOL
θJA
θJC
RATINGS
143
14
UNIT
°C/W
°C/W
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L11831A/B
Preliminary
CMOS IC
ELECTRICAL CHARACTERISTICS
(VIN=VOUT+500mV, VEN=VDD=5V, CIN=COUT=10µF, TA=TJ=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
POR Threshold
POR Hysteresis
Adjustable Pin Threshold
VTH_ADJ IOUT=1mA
Reference Voltage (ADJ Pin Voltage) VADJ IOUT=1mA
Fixed Output Voltage Range
VOUT
Line Regulation (VIN)
Load Regulation (Note 2)
VLINE_IN VIN=VOUT+0.5V to 5V, IOUT=1mA
VLOAD VIN=VOUT+1V, IOUT=1mA~3A
Dropout Voltage (Note 3)
VDROP
IOUT=2A
IOUT=3A
Quiescent Current (Note 4)
Current Limit
IQ VDD=5.5V
ILIM
Short Circuit Current
VOUT Pull Low Resistance
VOUT<0.2V
VEN=0V
Chip Enable
EN Input Bias Current
IEN VEN=0V
VDD Shutdown Current
L11831A
L11831B
ISHDN VEN=0V
EN Threshold Voltage
Logic-High
Logic-Low
VENH
VENL
VDD=5V
VDD=5V
Power Good
POK Rising Threshold
POK Hysteresis
POK Sink Capability
IPOK=10mA
POK Delay
MIN
2.4
0.788
-1.5
3.2
0.5
TYP MAX UNIT
2.7 3
V
0.2 V
0.2 0.4 V
0.8 0.812 V
0 1.5 %
0.2 0.6 %
0.4 1
%
200 250 mV
300 350 mV
0.9 mA
5.5 A
1.8 A
100
12 µA
10 20 µA
1 µA
1.2 V
0.7 V
90 93 %
3 10
%
0.2 0.4 V
0.5 1.5 5 ms
Thermal Protection
Thermal Shutdown Temperature
TSD
160 °C
Thermal Shutdown Hysteresis
TSD
30 °C
Notes: 1. The device is not guaranteed to function outside its operating conditions.
2. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested
for load regulation in the load range from 1mA to 3A.
3. The dropout voltage is defined as VIN-VOUT, which is measured when VOUT is VOUT(NORMAL)-100mV.
4. Quiescent, or ground current, is the difference between input and output currents. It is defined by
IQ=IIN-IOUT under no load condition (IOUT=0mA). The total current drawn from the supply is the sum of the
load current plus the ground pin current.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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