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BL1118
Dual 1A Low Dropout Regulator
DESCRIPTION
FEATURES
BL1118 is a dual channel low-dropout regulator that
delivers a maximum current of 1A for each
individual output. Typical dropout voltage at 1A
load current is 1.3V. Each individual output voltage
can be set independently as fixed voltage (e.g 1.2V,
1.8V, 2.5V, 3.3V, 5V) or adjustable output which can
provide an output voltage from 1.25 to 12V with
two external resistors. The output accuracy of each
channel is set within 2% by trimming.

BL1118 offers thermal shut down and current limit
functions to ensure reliability of device and power
system.
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
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Dual channel output with each individual
output can be either fixed output version or
adjustable version.
Maximum output current for each channel is 1A
Range of operation input voltage: Max 12V
Standby current of each output: 2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
Environment Temperature: -20C~85C
Compatible with tantalum capacitor,
electrolytic capacitor and MLCC.
APPLICATIONS

Package input/output pin configuration can be
customized on demand ( i.e both output can share
one input to save one input capacitor and
corresponding PCB real estate).
BL1118 is available in lead (Pb)-free ESOP-8(with
exposed pad for heat dissipation) package.
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Power Management for Computer Mother
Board, Graphic Card
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
TYPICAL APPLICATION
BL1118
Fig.1. Typical Application of BL1118
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BL1118
ORDERING INFORMATION
ABSOLUTE MAXIMUM RATING
BL1118 □
1□
2□
3□
4□
5
Code
Description
Temperature&Rohs:
C:-40~85C , Pb Free Rohs Std.
Package type:
S8: ESOP-8
Packing type:
TR: Tape&Reel (Standard)
CH1 Output voltage:
e.g. 33=3.3V
AD=ADJ
CH2 Output voltage:
e.g. 33=3.3V
AD=ADJ
1
□
2
□
3
□
4
□
5
□
1118
Product Code
LLLL
Lot No.
Parameter
Input Voltage Range
Ambient Temperature
BL1118CS8TR□□□□
XXYY
YY：
Vo2 Output
Voltage
PIN CONFIGURATION
Symbol
1
2
3
4
5
6
7
8
GND
Vin1
GND
Vin2
Vout2
Vout2
Vout1
Vout1
Description
Ground
Channel 1 Input
Ground
Channel 2 Input
Channel 2 Output
Channel 2 Output
Channel 1 Output
Channel 1 Output
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12V
125C
-20C -85C
10C / W
-40C -150C
260C,10S
RECOMMENDED WORK CONDITIONS
XX：
Vo1 Output
Voltage
PIN
Value
Note:
1) Exceed these limits to damage to the device.
2) Exposure to absolute maximum rating conditions
may affect device reliability.
MARKING DESCRIPTON
Marking
Parameter
Max Input Voltage
Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
Package Thermal
ESOP8
Resistance (jc)
Storage Temperature(Ts)
Lead Temperature & Time
2
Value
Max. 12V
-20C ～ 85C
BL1118
ELECTRICAL CHARACTERISTICS
*For each individual channel output
Test Conditions: Cin=0.1uF, Cout=10uF, TA=25C, unless otherwise specified.
Symbol
Vref
Vout
ΔVout
ΔVout
Parameter
Reference Voltage
Output Voltage
Line Regulation
Load Regulation
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Conditions
BL1118-ADJ
10mA≤Iout≤1A , Vin=3.25V
BL1118-1.2V
0≤Iout≤1A , Vin=3.2V
BL1118-1.8V
0≤Iout≤1A , Vin=3.8V
BL1118-2.5V
0≤Iout≤1A , Vin=4.5V
BL1118-3.3V
0≤Iout≤1A , Vin=5.3V
BL1118-5.0V
0≤Iout≤1A , Vin=7.0V
BL1118-1.2V
Iout=10mA, 2.7V≤Vin≤10V
BL1118-ADJ
Iout=10mA, 2.75V≤Vin≤12V
BL1118-1.8V
Iout=10mA, 3.3V≤Vin≤12V
BL1118-2.5V
Iout=10mA, 4.0V≤Vin≤12V
BL1118-3.3V
Iout=10mA, 4.8V≤Vin≤12V
BL1118-5.0V
Iout=10mA, 6.5V≤Vin≤12V
BL1118-1.2V
Vin =2.7V, 10mA≤Iout≤1A
BL1118-ADJ
Vin =2.75V, 10mA≤Iout≤1A
BL1118-1.8V
Vin=3.3V, 10mA≤Iout≤1A
BL1118-2.5V
Vin=4.0V, 10mA≤Iout≤1A
BL1118-3.3V
Vin=4.8V, 10mA≤Iout≤1A
BL1118-5.0V
Vin=6.5V, 10mA≤Iout≤1A
3
Min
Typ
Max
Unit
1.225
1.25
1.275
V
1.176
1.2
1.224
V
1.764
1.8
1.836
V
2.45
2.5
2.55
V
3.234
3.3
3.366
V
4.9
5
5.1
V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
BL1118
ELECTRICAL CHARACTERISTICS continued
Symbol
Vdrop
Parameter
Dropout Voltage
Conditions
Min
Typ
Max
Unit
Iout=100mA
1.23
1.3
V
Iout=1A
1.3
1.5
V
Ilimit
Current Limit
Vin-Vout=2V, Tj=25°C
Imin
Minimum Load Current
BL1118-ADJ
2
10
mA
BL1118-1.2V, Vin =10V
2
5
mA
BL1118-1.8V, Vin =12V
2
5
mA
BL1118-2.5V,Vin =12V
2
5
mA
BL1118-3.3V, Vin =12V
2
5
mA
BL1118-5.0V, Vin =12V
2
5
mA
55
120
uA
0.2
10
uA
Iq
IAdj
Ichange
ΔV/ΔT
JA
Quiescent Current
Adjust Pin Current
Iadj change
Temperature coefficient
Junction-Ambient
Thermal Resistance
BL1118-ADJ
Vin =5V, 10mA≤Iout≤1A
BL1118-ADJ
Vin =5V, 10mA≤Iout≤1A
ESOP-8
1
A
±100
ppm
63
°C/W
Note:
1) All test are conducted under ambient temperature 25°C and within a short period of time 20ms
2) Load current smaller than minimum load current of BL1118-ADJ will lead to unstable or oscillation output.
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BL1118
BLOCK DIAGRAM
Fig.2 Block Diagram for each individual Channel
DETAILED DESCRIPTION
BL1118 is a series of dual channel low-dropout regulator that delivers a maximum current of 1A for each
individual output. Typical dropout voltage at 1A load current is 1.3V. Each individual output voltage can be
set independently as fixed voltage (i.e. 1.2V, 1.8V, 2.5V, 3.3V, 5V) or adjustable output which can provide
an output voltage ranges from 1.25 to 12V with two external resistors. The output accuracy of each channel
is set within 2% by trimming.
The device has build-in modules including start-up circuit, bias circuit, bandgap, thermal shutdown, current
limit, power transistors and driver circuit. Thermal shut down and current limit functions ensure reliability
of device and power system.
The bandgap module provides stable reference voltage whose temperature coefficient is compensated by
careful design considerations. The temperature coefficient is under 100 ppm/°C. The accuracy of output
voltage is guaranteed by trimming technique.
Package input/output pin configuration can be customized on demand ( i.e both output can share one input
to save one input capacitor and corresponding PCB real estate).
BL1118 is available in lead (Pb)-free ESOP-8 package.
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BL1118
TYPICAL APPLICATION
BL1118
Fig.3. Typical Application Schematic of BL1118
BL1118 has both fixed voltage version (1.2V, 1.8V, 2.5V, 3.3V, 5V ) and adjustable voltage version. The
input and output capacitors of each channel can be either tantalum, electrolytic or ceramic capacitor.
Figure 3 shows both fixed voltage and adjustable voltage application schematic. Channel 1 (designated as
pin 1\2\7\8) is a typical application of fixed voltage. Channel 2 (designated as pin 3\4\5\6) is the schematic
of adjustable version application. The adjustable version provides a 1.25V reference voltage with regard to
its ADJ pin (shown as PIN 5\6 as its output and PIN3 as its adjustable pin in Fig.3). The output voltage of
adjustable version follows the equation:
Vout=1.25(1+R2/R1)+IAdjR2.
We can ignore IAdj because IAdj (about 50uA) is much less than the current of R1 ( in the order of several
milliamps).
1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower.
2) Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection. This bypass
capacitor prevents ripple from being amplified as the output voltage is increased. The impedance of CADJ
should be less than R1 to prevent ripple from being amplified. As R1 is normally in the range of 100Ω~500Ω,
the value of CADJ should satisfy this equation: 1/(2frippleCADJ)<R1.
THERMAL CONSIDERATIONS
Thermal consideration has to be taken account into to ensure proper function of the device. Power
dissipation of BL1118 can be calculated as
Power Dissipation = (Vin1-Vout1)×Iout1+ (Vin2-Vout2)×Iout2
For proper function and safe operation of the device, power dissipation is recommended to be limited
within 2W.
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BL1118
TYPICAL PERFORMANCE CHARACTERISTICS
Line Regulation
Load Regulation
LC1117-ADJ
VoutVs.Vs.
Vin
ADJ Vout
Vin
LC1117-ADJ
Vs. Iout
ADJ VoutVout
Vs. Iout
1.5
1.5
1.2
1.2
0.9
0.9
Vout(V)
Vout(V)
T=25°C unless specified.
0.6
0.6
0.3
0.3
0
0
0
2
4
6
8
10
12
0
14
0.2
0.4
0.6
1
1.2
Iout (A)
Vin (V)
Dropout Voltage
Thermal performance with OTP
LC1117-ADJ
Dropout
Vs. Iout
ADJ Dropout
Vs. Iout
LC1117-ADJ
Vout
Temp
ADJ Vout
Vs. Vs.
Temp
1.5
1.5
1.2
1.2
0.9
0.9
Vout(V)
Dropout voltage (V)
0.8
0.6
0.3
0.6
0.3
0
0
0
0.2
0.4
0.6
0.8
1
1.2
-50
Iout (A)
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0
50
100
Temperature (C)
7
150
200
BL1118
PACKAGE OUTLINE
Package
ESOP-8
Devices per reel
2500Pcs
Package specification：
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8
Unit
mm