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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
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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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