BL1117C

BL1117C
1A Low Dropout Voltage Regulator
：
Outline：
Features：
：
• Other than a fixed version and an
adjustable version, output value can be
customized on command.
BL1117C is a series of low dropout threeterminal regulators with a dropout of 1.26V at
1A load current.
•
•
•
•
•
Other than a fixed version（Vout＝
1.2V,1.8V,2.5V,2.85V,3.3V,5V）, BL1117C
has an adjustable version, which can provide
an output voltage from 1.25 to 13.8V with
only two external resistors。
BL1117C offers thermal shut down and
current limit functions, to assure the stability
of chip and power system. And it uses
trimming technique to guarantee output
voltage accuracy within ±1.5％(1.2V version
is within ±2％).Other output voltage accuracy
can be customized on command, such as ±1
％ or ±2％.
Maximum output current is 1A
Range of operation input voltage: Max 15V
Line regulation: 0.2％
Load regulation: 0.4％
Environment Temperature: -40℃~85℃
Applications：
：
•
•
•
•
•
BL1117C is available in SOT-223,TO-252
and SOT89-3 power package。
Power Management for Computer Mother
Board, Graphic Card
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
Pin Configuration：
：
：
Selection Guide：
BL1117C-XX X X
Package Type：
X：SOT-223
M：SOT-89-3
Y：TO-252
Temp. Range & Rohs Std.：
A：140C & Pb-free Rhos
Std,Output voltage accuracy
within ±1％
C： 140C & Pb-free Rohs
Std,Output voltage accuracy
within ±1.5％(Default,1.2V
version is within ±2％)
D：140C & Pb-free Rohs
Std,Output voltage accuracy
within ±2％
A：
：
Means
Manufacture LOT
No.
B:
Means Output
Voltage Value
C:
Means Temp.
Range&Rohs Std
Output Voltage：
12……1.2V
18……1.8V
25……2.5V
33……3.3V
50……5.0V
Default：Adjustable Version
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BL1117C
Pin Description：
：
Fixed Version
Pin No.
1
2
3
Symbol
GND
Vout
Vin
Definition
Ground
Output
Input
Adjustable Version
Pin No.
1
2
3
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
Ordering Information:
Product No.
BL1117C-12AX
BL1117C-18AX
BL1117C-25AX
BL1117C-28AX
BL1117C-33AX
BL1117C-50AX
BL1117C-AX
BL1117C-12AM
BL1117C-18AM
BL1117C-25AM
BL1117C-28AM
BL1117C-33AM
BL1117C-50AM
BL1117C-AM
BL1117C-12AY
BL1117C-18AY
BL1117C-25AY
BL1117C-28AY
BL1117C-33AY
BL1117C-50AY
BL1117C-AY
Product No.
BL1117C-12CX
BL1117C-18CX
BL1117C-25CX
BL1117C-28CX
BL1117C-33CX
BL1117C-50CX
BL1117C-CX
BL1117C-12CM
BL1117C-18CM
BL1117C-25CM
BL1117C-28CM
BL1117C-33CM
BL1117C-50CM
BL1117C-CM
BL1117C-12CY
BL1117C-18CY
BL1117C-25CY
BL1117C-28CY
BL1117C-33CY
BL1117C-50CY
BL1117C-CY
Product No.
BL1117C-12DX
BL1117C-18DX
BL1117C-25DX
BL1117C-28DX
BL1117C-33DX
BL1117C-50DX
BL1117C-DX
BL1117C-12DM
BL1117C-18DM
BL1117C-25DM
BL1117C-28DM
BL1117C-33DM
BL1117C-50DM
BL1117C-DM
BL1117C-12DY
BL1117C-18DY
BL1117C-25DY
BL1117C-28DY
BL1117C-33DY
BL1117C-50DY
BL1117C-DY
Output Voltage
1.2V
1.8 V
2.5 V
2.85 V
3.3 V
5.0V
Adj.
1.2V
1.8 V
2.5 V
2.85 V
3.3 V
5.0V
Adj.
1.2 V
1.8 V
2.5 V
2.85 V
3.3 V
5.0V
Adj.
Package
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
Block Diagrams：
：
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BL1117C
：
Absolute Maximum Ratings：
Maximum Input Voltage --------------------------------------------------------------------------15V
Operating Junction Temperature (TJ) ---------------------------------------------------------150°C
Environment Temperature (TA) -----------------------------------------------------------------85°C
Storage Temperature (Ts) ------------------------------------------------------------------------65～150°C
Recommended Work Conditions：
：
Item
Input Voltage Range
Operating junction Temperature
Min
Recommended
-40
Max
15
125
Unit
V
°C
Electrical Characteristics (Table 1)：
：
Tj=25℃
Symbol
Parameter
Reference
Voltage
Vref
Vout
Output
Voltage
Conditions
Min
Typ
Max
Unit
Iout=10mA, Vin-Vout=2V
10mA≤Iout≤1A ,1.5V≤Vin-Vout≤12V
1.231
1.225
1.25
1.25
1.268
1.275
V
BL1117C-1.20V
Iout=10mA,Vin=3.2V,Tj=25℃
0≤Iout≤1A ,3.0V≤Vin≤12V
1.176
1.14
1.20
1.20
1.224
1.248
V
BL1117C-1.80V
Iout=10mA,Vin=3.8V,Tj=25℃
0≤Iout≤1A ,3.2V≤Vin≤12V
1.773
1.764
1.80
1.80
1.827
1.836
V
BL1117C-2.5V
Iout=10mA,Vin=4.5V,Tj=25℃
0≤Iout≤1A ,3.9V≤Vin≤12V
2.462
2.45
2.5
2.5
2.538
2.55
V
BL1117C-2.85V
Iout=10mA,Vin=4.85V,Tj=25℃
0≤Iout≤1A ,4.25V≤Vin≤12V
2.807
2.793
2.85
2.85
2.893
2.907
V
BL1117C-3.3V
Iout=10mA,Vin=5V,Tj=25℃
0≤Iout≤1A ,4.75V≤Vin≤12V
3.250
3.234
3.3
3.3
3.349
3.366
V
4.925
4.9
5
5
5.075
5.1
V
0.035
0.2
%
BL1117C-1.2V
Iout=10mA,3.0V≤Vin≤15V
10
15
mV
BL1117C-1.8V
Iout=10mA,3.8V≤Vin≤15V
10
15
mV
BL1117C-5V
Iout=10mA,Vin=7V,Tj=25℃
0≤Iout≤1A ,6.5V≤Vin≤12V
∆Vout
Line
Regulation
(note1)
BL1117C-ADJ
Iout=10mA,1.5V≤Vin-Vout≤13.775V
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BL1117C
∆Vout
Vin-Vout
Load
Regulation
(note1, 2)
Dropout
Voltage
（note3）
BL1117C-2.5V
Iout=10mA,3.9V≤Vin≤15V
10
15
mV
BL1117C-2.85V
Iout=10mA,4.25V≤Vin≤15V
10
15
mV
BL1117C-3.3V
Iout=10mA,4.75V≤Vin≤15V
10
15
mV
BL1117C-5V
Iout=10mA,6.5V≤Vin≤15V
10
15
mV
BL1117C-ADJ
Vin-Vout=3V, 10mA≤Iout≤1A
0.2
0.4
%
BL1117C-1.2V
Vin=3.0V, 0≤Iout≤1A
8
20
mV
BL1117C-1.8V
Vin=3.2V, 0≤Iout≤1A
8
20
mV
BL1117C-2.5V
Vin=3.9V, 0≤Iout≤1A
8
20
mV
BL1117C-2.85V
Vin=4.25V, 0≤Iout≤1A
8
20
mV
BL1117C-3.3V
Vin=4.75V, 0≤Iout≤1A
8
20
mV
BL1117C-5V
Vin=6.5V, 0≤Iout≤1A
8
20
mV
∆Vout, ∆Vref =1%，Iout=100mA
1.11
1.2
V
∆Vout, ∆Vref,=1%，Iout=500mA
1.18
1.25
V
∆Vout, ∆Vref,=1%，Iout=1A
1.26
1.3
V
1.2
1.4
A
Ilimit
Current Limit
Vin-Vout=2V, Tj=25℃
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BL1117C
Minimum
Load Current
（note4）
BL1117C-ADJ
5
10
mA
BL1117C-1.2V,Vin-Vout=1.25V
4
8
mA
BL1117C-1.8V,Vin-Vout=1.25V
4
8
mA
BL1117C-2.5V, Vin-Vout=1.25V
4
8
mA
BL1117C-2.85V, Vin-Vout=1.25V
4
8
mA
BL1117C-3.3V, Vin-Vout=1.25V
4
8
mA
BL1117C-5V, Vin-Vout=1.25V
4
8
mA
IAdj
Adjust Pin
Current
(Adjustable
Version)
55
120
uA
Ichange
Adjust Pin
Current
Change
0.2
Quiescent
Current
Iq
Temperature
Stability
θJC
Thermal
Resistor
uA
0.5
SOT-223
20
TO-252
10
%
℃/W
Note：
：
Note1：The Parameters of Line Regulation and Load Regulation in Table1 are tested under
constant junction temperature. The Curve of Load Regulation vs. Temperature is
shown in typical parameter curve that follows.
Note2： When Iout varies between 0~1A,Vin-Vout varies between 1.5V~12V under constant
junction temperature，the parameter is satisfied the criterion in table. If temperature
varies between -40℃≤TA≤85℃，it needs output current to be larger than 10mA to
satisfy the criterion.
Note3：Dropout Voltage is specified over the full output current range of the device, and it is
tested under following testing conditions: First step is to find out the Vout value(Vout1)
when Vin1=Vout+1.5V, second step is to decrease Vin(Vin2) until Vout value is equal
to 98.5%*Vout1(Vout2). Vdropout=Vin2-Vout2.
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BL1117C
Note4：Minimum Load Current is defined as the minimum output current required to maintain
regulation. When 1.5V≦Vin-Vout≦12V，the device is guaranteed to regulate if the
output current is greater than 10mA.
Detailed Description:
BL1117C is a series of low dropout voltage, three terminal regulators. Its application circuit is
very simple: the fixed version only needs two capacitors and the adjustable version only needs two
resistors and two capacitors to work. It is composed of some modules including start-up circuit,
bias circuit, bandgap, thermal shutdown, current limit, power transistors and its driver circuit and so
on.
The thermal shut down and current limit modules can assure chip and its application system
working safety when the junction temperature is larger than 140℃ or output current is larger than
1.2A.
The bandgap module provides stable reference voltage, whose temperature coefficient is
compensated by careful design considerations. The temperature coefficient is under 100ppm/℃.
And the accuracy of output voltage is guaranteed by trimming technique,
Typical Application ：
BL1117C has an adjustable version and five fixed versions, Chart1 is its typical application：
Chart 1: Application circuit of BL1117C fixed version
Application Hints：
：
1.
2.
3.
Recommend using 10uF tan capacitor as bypass capacitor(C1) for all application circuit.
Recommend using 22uF tan capacitor to assure circuit stability.
Using a bypass capacitor(CAdj) between the adjust terminal 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 the resistor’s(R1) which is
between output and adjust pins to prevent ripple from being amplified at any ripple
frequency. As R1 is normally in the range of 200Ω~350Ω,the value of CAdj should satisfy
this equation: 1/(2π*Fripple*Cadj)<R1. Recommend using 10uF tan capacitor.
Output Voltage of Adjustable Version：
：
The BL1117C adjustable version provide 1.25V Reference Voltage. Any output voltage
between 1.25V~13.8V can be available by choosing two external resistors (connection method
is shown in chart 2). In chart 2, R1,R2 is the two external resistors
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BL1117C
Chart 2. Application Circuit of BL1117C adjustable version
Explanation ：
The output voltage of adjustable version satisfies this followed equation:
VOut=VRef*(1+R2/R1)+IAdj*R2. We can ignore IAdj because IAdj(about 50uA) is much less
than the current of R1(about 4mA).
How to choose R1：The value of R1 should be in the range of 200Ω～350Ω to assure chip
working normally without any load. To assure the electrical performance showed in table 1, the
output current should be larger than 5mA. If R1 is too large, the minimum output current should
be larger than 4mA , The best working condition is to assure that the output current exceeds
10mA.
Thermal Considerations：
：
We have to take heat dissipation into consideration when output current or differential
voltage of input and output voltage is large. Because in such cases, the power dissipation
consumed by BL1117C is very large. BL1117C series uses SOT-223 package type and its
thermal resistance is about 20℃/W. And the copper area of application board can affect the total
thermal resistance. If copper area is 5cm*5cm（two sides）, the resistance is about 30℃/W. So
total thermal resistance is about 20℃/W+30℃/W. We can decrease total thermal resistance by
increasing copper area in application board.
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BL1117C
：
Typical Characteristics：
1.BL1117C Dropout Voltage
2.BL1117C Line Regulation
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Line Regulation（Vout=3.3V，Iout=10mA）
Output Voltage（V）
Dropout Voltage
（V）
Dropout Voltage (TA=25℃,90℃)
T=90℃
0
200
400
600
800 1000
Output Current（mA）
1200
3.5
3.4
3.3
3.2
3.1
3
1400
4
6
8
10
12
Input Voltage（V）
14
16
3.BL1117C Load Regulation
Load Regulation (Vout=3.3V)
Output Voltage（V）
∆Vout/Vout*100％
Load Regulation VS. Temp（Iout from10mA to1A）
1
0.5
0
-0.5
-1
-50
-25
0
25
50
75
100
Temperature（℃）
125
3.35
3.3
3.25
3.2
3.15
3.1
0
150
200
400
600 800 1000 1200 1400 1600
Output Current (mA)
4.BL1117C Temperature Stability
Output Voltage VS. Temperature
Output Voltage
（V）
3.5
3
2.5
2
1.5
1
0.5
0
-50 -25
∆Vout/Vout*100%
Output Voltage（Vout＝3.3V）VS.Temperature
0
25 50 75 100 125 150 175 200
Temperature（℃）
0
25
50
75 100
Temperature(℃)
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Adj Pin Current（uA)
1
0
-1
-2
-50
-25
0
25
50
75
100
125
150
Temperature（℃）
Ch1: Load current change from 2mA to500 mA
Adj Pin Current VS. Temperature
-25
2
6.BL1117C Load Transient Response
5.BL1117C Adj Pin Current VS. Temperature
70
60
50
40
30
20
10
0
-50
3
125
150
<50mV
175
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BL1117C
Package outline:
1.SOT-223
Package
SOT-223
Devices per
reel
1000
Unit
mm
Package specification：
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BL1117C
Taping dimension：（M1：Standard Type ，M2：Customized）
Taping reel dimension：
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BL1117C
2.TO-252
Package
TO-252
Devices per
reel
2500
Unit
mm
Package specification：
Taping dimension：（M1：Standard Type ，M2：Customized）
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BL1117C
Taping reel dimension：
2.SOT-89-3
Package
SOT-89-3
Devices per
reel
1000
Unit
mm
Package Dimension:
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BL1117C
Taping Specification:（M1：Standard Type，M2：Customized）
Taping Reel Dimension：
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