BL1117

BL1117
1A Low Dropout Voltage Regulator
：
Outline：
Features：
：
• Other than a fixed version and an
adjustable version, output value can be
customized on command.
BL1117 is a series of low dropout threeterminal regulators with a dropout of 1.2V at
1A load current.
•
•
•
Other than a fixed version（Vout＝
1.8V,2.5V,2.85V,3.3V,5V）, BL1117 has an
adjustable version, which can provide an
output voltage from 1.25 to 13.8V with only
two external resistors。
Maximum output current is 1A
Output voltage accuracy is within ±1％
Range of operation input voltage: Max
15V
•
•
•
BL1117 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％.
Line regulation: 0.2％
Load regulation: 0.4％
Environment Temperature: -40℃~85℃
Applications：
：
•
BL1117 is available in SOT-223,TO-252
and TO-220 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：
BL1117-XX X X
A：
：
Means
Manufacture
weeks
Package Type：
X：SOT-223
Y：TO-252
Z：TO-220
Temp. Range & Rohs Std.：
C：140C & Pb-free Rhos Std
Z: 140C & Pb/Sn Plating
C:
Means Output
Voltage Value
D:
Means Temp.
Range&Rohs Std
Output Voltage：
18……1.8V
25……2.5V
28……2.85V
50……5.0V
Default：Adjustable
Version
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B：
：
Means
Manufacture LOT
No.
-1Total 13 Pages
1/29/2008
BL1117
Pin Description：
：
Fixed Version
Pin No.
1
2
3
Symbol
GND
Vout
Vin
Definition
Ground
Output
Input
Ordering Information:
Package Marking
BL1117-18CX
BL1117-25CX
BL1117-28CX
BL1117-33CX
BL1117-50CX
BL1117-CX
BL1117-18CY
BL1117-25CY
BL1117-28CY
BL1117-33CY
BL1117-50CY
BL1117-CY
BL1117-18CZ
BL1117-25CZ
BL1117-28CZ
BL1117-33CZ
BL1117-50CZ
BL1117-CZ
Adjustable Version
Pin No.
1
2
3
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
Output Voltage
Package Type
1.8 V
2.5 V
2.85V
3.3 V
5.0V
Adj.
1.8 V
2.5 V
2.85V
3.3 V
5.0V
Adj.
1.8 V
2.5 V
2.85V
3.3 V
5.0V
Adj.
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
SOT-223
TO-252
TO-252
TO-252
TO-252
TO-252
TO-252
TO-220
TO-220
TO-220
TO-220
TO-220
TO-220
Block Diagrams：
：
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BL1117
Absolute Maximum Ratings：
：
Maximum Input Voltage --------------------------------------------------------------------------18V
Operating Junction Temperature (TJ) ---------------------------------------------------------150°C
Environment Temperature (TA) -----------------------------------------------------------------85°C
Storage Temperature (Ts) ------------------------------------------------------------------------65～150°C
Lead Temperature and Time --------------------------------------------------------------------260°C,10S
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
1.238
1.225
1.25
1.25
1.262
1.275
V
BL1117-1.80V
Iout=10mA,Vin=3.8V,Tj=25℃
0≤Iout≤1A ,3.2V≤Vin≤12V
1.782
1.764
1.80
1.80
1.818
1.836
V
BL1117-2.5V
Iout=10mA,Vin=4.5V,Tj=25℃
0≤Iout≤1A ,3.9V≤Vin≤12V
2.475
2.45
2.5
2.5
2.525
2.55
V
BL1117-2.85V
Iout=10mA,Vin=4.85V,Tj=25℃
0≤Iout≤1A ,4.25V≤Vin≤12V
2.822
2.793
2.85
2.85
2.878
2.907
V
BL1117-3.3V
Iout=10mA,Vin=5V,Tj=25℃
0≤Iout≤1A ,4.75V≤Vin≤12V
3.267
3.234
3.3
3.3
3.333
3.366
V
4.95
4.9
5
5
5.05
5.1
V
0.035
0.2
%
BL1117-1.8V
Iout=10mA,3.2V≤Vin≤15V
9
12
mV
BL1117-2.5V
Iout=10mA,3.9V≤Vin≤15V
9
12
mV
BL1117-2.85V
Iout=10mA,4.25V≤Vin≤15V
9
12
mV
BL1117-5V
Iout=10mA,Vin=7V,Tj=25℃
0≤Iout≤1A ,6.5V≤Vin≤12V
∆Vout
Line
Regulation
(note1)
BL1117-ADJ
Iout=10mA,1.5V≤Vin-Vout≤13.775V
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BL1117
BL1117-3.3V
Iout=10mA,4.75V≤Vin≤15V
9
12
mV
BL1117-5V
Iout=10mA,6.5V≤Vin≤15V
9
12
mV
0.2
0.4
%
BL1117-1.8V
Vin=3.2V, 0≤Iout≤1A
3
10
mV
BL1117-2.5V
Vin=3.9V, 0≤Iout≤1A
3
10
mV
BL1117-2.85V
Vin=4.25V, 0≤Iout≤1A
3
10
mV
BL1117-3.3V
Vin=4.75V, 0≤Iout≤1A
3
10
mV
BL1117-5V
Vin=6.5V, 0≤Iout≤1A
3
10
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
1.4
1.6
A
BL1117-ADJ
5
10
mA
BL1117-1.8V,Vin-Vout=1.25V
4
8
mA
BL1117-2.5V, Vin-Vout=1.25V
4
8
mA
BL1117-ADJ
Vin-Vout=3V, 10mA≤Iout≤1A
∆Vout
Vin-Vout
Load
Regulation
(note1, 2)
Dropout
Voltage
（note3）
Current Limit
Vin-Vout=2V, Tj=25℃
1.25
Ilimit
Minimum
Load Current
（note4）
Iq
Quiescent
Current
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BL1117
BL1117-2.85V, Vin-Vout=1.25V
4
8
mA
BL1117-3.3V, Vin-Vout=1.25V
4
8
mA
BL1117-5V, Vin-Vout=1.25V
4
8
mA
IAdj
Adjust Pin
Current
(Adjustable
Version)
55
120
uA
Ichange
Adjust Pin
Current
Change
0.2
Temperature
Stability
θJC
Thermal
Resistor
uA
0.5
SOT-223
20
TO-252
10
TO-220
4.5
%
℃/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 99%*Vout1(Vout2). Vdropout=Vin2-Vout2.
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:
BL1117 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
1.4A.
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BL1117
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 ：
BL1117 has an adjustable version and five fixed versions, Chart1 is its typical application：
Chart 1: Application circuit of BL1117 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 BL1117 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
Chart 2. Application Circuit of BL1117 adjustable version
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BL1117
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 BL1117 is very large. BL1117 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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BL1117
：
Typical Characteristics：
1.BL1117 Dropout Voltage
2.BL1117 Line Regulation
1.4
1.2
1
0.8
0.6
0.4
0.2
0
Line Regulation（Vout=3.3V，Iout=10mA）
T=90℃
0
200
400
600
800 1000
Output Current（mA）
1200
1400
Output Voltage（V）
Dropout Voltage
（V）
Dropout Voltage (TA=25℃,90℃)
3.5
3.4
3.3
3.2
3.1
3
4
6
8
10
12
Input Voltage（V）
14
16
3.BL1117 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.BL1117 Temperature Stability
Output Voltage VS. Temperature
Output Voltage（Vout＝3.3V）VS.Temperature
Output Voltage
（V）
∆Vout/Vout*100%
3.5
3
2.5
2
1.5
1
0.5
0
-50 -25
0
25 50 75 100 125 150 175 200
Temperature（℃）
2
1
0
-1
-2
-50
-25
0
25
50
75
100
125
150
Temperature（℃）
6.BL1117 Load Transient Response
5.BL1117 Adj Pin Current VS. Temperature
Ch1: Load current change from 2mA to500 mA
Adj Pin Current VS. Temperature
Adj Pin Current（uA)
3
70
60
50
40
30
20
10
0
Ch2: Response of output voltage
-50
-25
0
25
50
75 100
Temperature(℃)
125
150
<50mV
175
Time ：20us/pix
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BL1117
Package outline:
1.SOT-223
Package
SOT-223
Devices per
reel
1000
Unit
mm
Package specification：
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BL1117
Taping dimension：（M1：Standard Type ，M2：Customized）
Taping reel dimension：
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BL1117
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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BL1117
Taping reel dimension：
3.TO-220
Package
TO-220
Devices per
tube
50
Unit
mm
Package specification：
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BL1117
Tube dimension：
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