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UNISONIC TECHNOLOGIES CO., LTD
L11831A/B/C
MAXIMUM 3A, ULTRA LOW
DROPOUT REGULATOR WITH
ENABLE
DESCRIPTION
The UTC L11831A/B/C 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. There
are two additional pin in the UTC L11831A/B/C. One is EN pin and
the other is POK pin.
The UTC L11831A/B/C 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
* 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
1
CMOS IC
HSOP-8
DFN3030-10
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
L11831XL-xx-SH2-R
L11831XG-xx-SH2-R
L11831XL-xx-K10-3030-R L11831XG-xx-K10-3030-R
Note: xx: Output Voltage, refer to Marking Information.
Package
HSOP-8
DFN3030-10
Packing
Tape Reel
Tape Reel
L11831XG-xx-SH2-R
(1)Packing Type
(2)Package Type
(3)Output Voltage Code
(4)Green Package
(5)EN Pin Function
(1) R: Tape Reel
(2) SH2: HSOP-8, K10-3030: DFN3030-10
(3) xx: Refer to Marking Information
(4) G: Halogen Free and Lead Free, L: Lead Free
(5) A: Internal Pull High, B: Internal Pull Low
C: Internal Pull Low, soft-start time
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Copyright © 2019 Unisonic Technologies Co., Ltd
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L11831A/B/C
MARKING INFORMATION
PACKAGE VOLTAGE CODE
HSOP-8
DFN3030-10
12: 1.2v
15 : 1.5V
18: 1.8V
25: 2.5V
AD: ADJ
CMOS IC
MARKING
8 765
A: Internal Pull High
B: Internal Pull Low
C: Internal Pull Low, soft-start time
Voltage Code
UTC
L11831X
1 234
Date Code
L: Lead Free
G: Halogen Free
Lot Code
Voltage Code
L
11831
A: Internal Pull High
B: Internal Pull Low
C: Internal Pull Low, soft-start time
Date Code
PIN CONFIGURATION
POK 1
EN 2
VIN 3
VDD 4
GND
HSOP-8
8 GND
7 ADJ
6 VOUT
5 NC
VOUT 1
VOUT 2
VOUT 3
ADJ 4
POK 5
10 VDD
9 VIN
GND
8 VIN
7 VIN
11 6 EN
Top View
DFN3030-10
PIN DESCRIPTION
PIN NO.
HSOP-8 DFN3030-10
15
26
3 7~9
4 10
5-
6 1~3
74
8 11
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)
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/C
BLOCK DIAGRAM
POK
VIN
VDD
EN
CMOS IC
Power Good
Circult
Sense Select
VOUT
R2
Over
Temperature
-+
0.8V
REF
-+
0.2V
R1
ADJ
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L11831A/B/C
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
2.5 ~ 5.5
3.0 ~ 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/C
CMOS IC
ELECTRICAL CHARACTERISTICS
(VIN=VOUT+500mV, VEN=VDD=5V, CIN=COUT=10µF, TA=TJ=25°C, unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNIT
POR Threshold
2.4 2.7 3
V
POR Hysteresis
0.2 V
Adjustable Pin Threshold
VTH_ADJ IOUT=1mA
0.2 0.4 V
Reference Voltage (ADJ Pin Voltage)
Fixed Output Voltage Range
Line Regulation (VIN)
Load Regulation (Note 2)
VADJ
ΔVOUT
ΔVLINE_IN
ΔVLOAD
IOUT=1mA
VIN=VOUT+0.5V to 5V, IOUT=1mA
VIN=VOUT+1V, IOUT=1mA~3A
0.788
-1.5
0.8 0.812
0 1.5
0.2 0.6
0.4 1
V
%
%
%
Dropout Voltage (Note 3)
VDROP
IOUT=2A
IOUT=3A
200 250 mV
300 350 mV
Quiescent Current (Note 4)
Current Limit
IQ VDD=5.5V
ILIM
1.1
3.2 5.5
mA
A
Short Circuit Current
VOUT Pull Low Resistance
Soft-Start
L11831C
Chip Enable
VOUT<0.2V
VEN=0V
TSS VOUT=10% to 90%
0.5 1.8
110
2.5
A
Ω
ms
EN Input Bias Current
L11831A
L11831B
L11831C
L11831A
VEN=0V
IEN VEN=5V
VEN=5V
12 µA
12 µA
12 µA
10 20 µA
VDD Shutdown Current L11831B
L11831C
ISHDN VEN=0V
1 µA
1 µA
EN Threshold Voltage
Power Good
Logic-High
Logic-Low
VENH
VENL
VDD=5V
VDD=5V
1.2 V
0.7 V
POK Rising Threshold
90 %
POK Hysteresis
3 10
%
POK Sink Capability
IPOK=10mA
0.2 0.4 V
POK Delay
L11831A/B
L11831C
TPOK VOUT90% to Pok Rising
0.25 ms
0.55 ms
Thermal Protection
Thermal Shutdown Temperature
TSD
Thermal Shutdown Hysteresis
ΔTSD
Notes: 1. The device is not guaranteed to function outside its operating conditions.
160 °C
30 °C
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. 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.
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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