BL1117

BL1117
1A Bipolar Linear Regulator
DESCRIPTION
FEATURES
BL1117 is a series of low dropout three-terminal
regulators with a dropout of 1.3V at 1A load current.
BL1117 features a very low standby current 2mA
compared to 5mA of competitor.
Other than a fixed version, Vout = 1.2V, 1.5V, 1.8V,
2.5V, 3.3V, 5V, and 12V, BL1117 has an adjustable
version, which can provide an output voltage from
1.25 to 12V with only two external resistors.
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 2%.
Other output voltage accuracy can be customized
on demand, such as 1%







Other than a fixed version and an adjustable
version, output value can be customized on
demand.
Maximum output current is 1A
Range of operation input voltage: Max 12V
Standby current: 2mA (typ.)
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
Environment Temperature: -40C~85C
APPLICATIONS

Power Management for Computer Mother
Board, Graphic Card
BLD Monitor and BLD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
BL1117 is available in SOT-223, TO-252 power
package.




TYPICAL APPLICATION
TYPICAL ELECTRICAL CHARACTERISTIC
LC1117
BL1117
Vin
Vin
10uF
Gnd
BL1117
Vout
Vout
10uF
Application circuit of BL1117 fixed version
NOTE: Input capacitor (Cin=10uF) and Output
capacitor (Cout=10uF) are recommended in all
application circuit. Tantalum or MLCC capacitor is
recommended.
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BL1117
ORDERING INFORMATION
PIN CONFIGURATION
BL1117-XX X X
Pin Description：
Fixed Version
Package Type：
X：SOT-223
Y：TO-252
Pin No.
1
2
3
Temp. Range & Rohs Std.：
A：85C & Pb-free Rhos
Std,Output voltage accuracy
within 1％
C： 85C & Pb-free Rohs
Std,Output voltage accuracy
within 2％
Pin No.
1
2
3
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
A：Means assembly year and weeks
Year
2010
Y
0
Week 1 2
2011 2012 2013 …
1
2
… 26
Parameter
3
…
27 … 52
… Z
W A B
…
B：Means Manufacture LOT No.
C：Means Output Voltage Value
D：Means Temp. Range&Rohs Std
ABSOLUTE MAXIMUM RATING
53
A
Value
15V
150C
-40C – 85C
20C / W
10C / W
-40C - 150C
260C, 10S
Max Input Voltage
Max Operating Junction Temperature(Tj)+
Ambient Temperature(Ta)
Package Thermal Resistance
SOT-223
TO-252
Storage Temperature(Ts)
Lead Temperature & Time
RECOMMENDED WORK CONDITIONS
Parameter
Value
Max. 12V
-20C –125C
Input Voltage Range
Operating Junction Temperature(Tj)
Exceptional for BL1117-12V, the maximum input voltage for BL1117-12V is 20V.
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Definition
Ground
Output
Input
Adjustable Version
Output Voltage：
12……1.2V
15……1.5V
18……1.8V
25……2.5V
33……3.3V
50……5.0V
Default：Adjustable Version

Symbol
GND
Vout
Vin
2
Note: Exceed these limits to
damage to the device.
Exposure
to
absolute
maximum rating conditions
may affect device reliability.
BL1117
ELECTRICAL CHARACTERISTICS+
Tj=25C
Symbol
Vref
Vout
ΔVout
Parameter
Reference Voltage
Output Voltage
Line Regulation
Conditions
BL1117-ADJ
10mA≤Iout≤1A , Vin=3.25V
BL1117-1.2V
0≤Iout≤1A , Vin=3.2V
BL1117-1.5V
0≤Iout≤1A , Vin=3.5V
BL1117-1.8V
0≤Iout≤1A , Vin=3.8V
BL1117-2.5V
0≤Iout≤1A , Vin=4.5V
BL1117-3.3V
0≤Iout≤1A , Vin=5.3V
BL1117-5.0V
0≤Iout≤1A , Vin=7.0V
BL1117-12.0V
0≤Iout≤1A , Vin=14V
BL1117-1.2V
Iout=10mA, 2.7V≤Vin≤10V
BL1117-ADJ
Iout=10mA, 2.75V≤Vin≤12V
BL1117-1.5V
out=10mA, 3.0V≤Vin≤12V
BL1117-1.8V
Iout=10mA, 3.3V≤Vin≤12V
BL1117-2.5V
Iout=10mA, 4.0V≤Vin≤12V
BL1117-3.3V
Iout=10mA, 4.8V≤Vin≤12V
BL1117-5.0V
Iout=10mA, 6.5V≤Vin≤12V
BL1117-12.0V
Iout=10mA, 13.5V≤Vin≤20V
BL1117-1.2V
Vin =2.7V, 10mA≤Iout≤1A
BL1117-ADJ
Vin =2.75V, 10mA≤Iout≤1A
BL1117-1.5V
Vin=3.0V, 10mA≤Iout≤1A
Min
Typ
Max
Unit
1.225
1.25
1.275
V
1.176
1.2
1.224
V
1.47
1.5
1.53
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
11.76
12
12.24
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
0.1
0.2
+%/V
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
BL1117-1.8V
Vin=3.3V, 10mA≤Iout≤1A
ΔVout
Load Regulation
BL1117-2.5V
Vin=4.0V, 10mA≤Iout≤1A
BL1117-3.3V
Vin=4.8V, 10mA≤Iout≤1A
BL1117-5.0V
Vin=6.5V, 10mA≤Iout≤1A
BL1117-12.0V
Vin=13.5V, 10mA≤Iout≤1A
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BL1117
ELECTRICAL CHARACTERISTICS continued
+ Tj=25C
Symbol
Parameter
Vdrop
Dropout Voltage
Ilimit
Current Limit
SVR
Imin
Iq
IAdj
Supply Voltage Rejection
Minimum Load Current
Quiescent Current
Adjust Pin Current
Ichange
Iadj change
ΔV/ΔT
Temperature coefficient
JC
JA
Thermal Resistance
Thermal Resistance
Junction-to-Ambient
(No air flow)
Conditions
Typ
Max
Unit
Iout=100mA
1.23
1.3
V
Iout=1A
1.3
1.5
V
Vin-Vout=2V, Tj=25°C
Min
1
A
60
f = 120Hz, VIN − VOUT = 3V + 1VPP Ripple
BL1117-ADJ
4
6
10
mA
BL1117-1.2V, Vin =10V
1
2
5
mA
BL1117-1.5V, Vin =11V
1
2
5
mA
BL1117-1.8V, Vin =12V
1
2
5
mA
BL1117-2.5V,Vin =12V
1
2
5
mA
BL1117-3.3V, Vin =12V
1
2
5
mA
BL1117-5.0V, Vin =12V
1
2
5
mA
BL1117-12.0V, Vin =20V
1
2
5
mA
35
55
120
uA
0.2
10
uA
BL1117-ADJ
Vin =5V, 10mA≤Iout≤1A
BL1117-ADJ
Vin =5V, 10mA≤Iout≤1A
±100
SOT-223
20
TO-252
10
TO-220
4.5
SOT-223 (No heat sink)
136
TO-252 (No heat sink)
92
Note1: All test are conducted under ambient temperature 25°C and within a short period of time 20ms
Note2: Load current smaller than minimum load current of BL1117-ADJ will lead to unstable or oscillation output.
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dB
4
ppm
°C/W
°C/W
BL1117
BLOCK DIAGRAM
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 modules can assure chip and its application system working safety when the junction
temperature is larger than 140°C.
The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design
considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by
trimming technique.
TYPICAL APPLICATION
BL1117 has an adjustable version and six fixed versions (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V and 12V)
Fixed Output Voltage Version
LC1117
BL1117
Vin
Vin
10uF
Vout
Vout
Gnd
10uF
Application circuit of BL1117 fixed version
1)
2)
Recommend using 10uF tan capacitor or MLCC capacitor as bypass capacitor (C1) for all application circuit.
Recommend using 10uF tan capacitor MLCC capacitor to assure circuit stability.
3)
Capacitor ESR range: 3mΩ ~ 22Ω
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BL1117
Adjustable Output Voltage Version
BL1117-ADJ provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable by
choosing two external resistors (schematic is shown below), R1 and R2
BL1117
LC1117-ADJ
Vin
Vin
10uF
Vout
Vout
R1
ADJ
10uF
R2
Application Circuit of BL1117-ADJ
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 (about 2~10mA).
1)
To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As BL1117-ADJ
can keep itself stable at load current about 2mA, R1 is not allowed to be higher than 625ohm.
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
We have to take heat dissipation into great 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°C/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°C/W. So the total
thermal resistance is about 20°C/W + 30°C/W. We can decrease total thermal resistance by increasing copper area in
application board. When there is no good heat dissipation copper are in PCB, the total thermal resistance will be as
high as 120°C/W, then the power dissipation of BL1117 could allow on itself is less than 1W. And furthermore, BL1117
will work at junction temperature higher than 125°C under such condition and no lifetime is guaranteed.
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BL1117
TYPICAL PERFORMANCE CHARACTERISTICS
T=25°C unless specified.
Line Regulation
Load Regulation
BL1117
LC1117-ADJ Vout Vs. Iout
1.5
1.5
1.2
1.2
0.9
0.9
Vout(V)
Vout(V)
LC1117-ADJ Vout Vs. Vin
BL1117
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
Vin (V)
Dropout Voltage
1
1.2
Thermal performance with OTP
BL1117
LC1117-ADJ Dropout Vs. Iout
BL1117
LC1117-ADJ Vout Vs. Temp
1.5
1.5
1.2
1.2
0.9
0.9
Vout(V)
Dropout voltage (V)
0.8
Iout (A)
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
BL1117
APPLICATION NOTE：
Load Transient Response
Test Condition:
VIN=5V, VOUT=3.3V, CIN=1uF (Ceramic), COUT=10uF (Ceramic).
I : Iout=10mA~100mA
CH2: Output Voltage (500mV/div, DC), CH4: Output Current(50mA/div)
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BL1117
I : Iout=10mA~200mA
CH2: Output Voltage (500mV/div, DC), CH4: Output Current(50mA/div)
I : Iout=10mA~500mA
CH2: Output Voltage (500mV/div, DC), CH4: Output Current(200mA/div)
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BL1117
I : Iout=10mA~800mA
CH2: Output Voltage (500mV/div, DC), CH4: Output Current(200mA/div)
Load Transient Response
Test Condition:
VIN=3.3V, VOUT=ADJ, CIN=1uF (Ceramic), COUT=10uF (Ceramic).
I : Iout=10mA~100mA
CH2: Output Voltage (200mV/div, DC), CH4: Output Current (50mA/div)
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BL1117
I : Iout=10mA~200mA
CH2: Output Voltage (200mV/div, DC), CH4: Output Current(50mA/div)
I : Iout=10mA~500mA
CH2: Output Voltage (200mV/div, DC), CH4: Output Current(200mA/div)
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BL1117
I : Iout=10mA~800mA
CH2: Output Voltage (200mV/div, DC), CH4: Output Current(200mA/div)
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BL1117
PACKAGE OUTLINE
Package
SOT-223
Devices per reel
2500
Unit
mm
Package specification：
A
A1
A2
A3
b
b1
b2
b3
c
c1
D
D1
E
E1
e
e1
L
L1
L2
θ
θ 1
Taping dimension：（M1：Standard Type ，M2：Customized）
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MIN
1.50
0.02
1.45
0.80
0.67
0.66
2.96
2.95
0.30
0.29
6.35
6.30
6.80
3.40
NOM
1.65
0.06
1.60
0.90
0.71
3.00
0.30
6.50
7.00
3.50
2.30BSC
4.60BSC
0.80 1.00
1.75REF
0.25BSC
0°
10° 12°
MAX.
1.80
0.10
1.75
1.00
0.80
0.75
3.09
3.05
0.35
0.31
7.05
6.70
7.20
3.60
1.20
8°
14°
BL1117
Taping reel dimension：
Package
TO-252
Devices per reel
2500
Package specification：
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14
Unit
mm
BL1117
Taping dimension：（M1：Standard Type ，M2：Customized）
Taping reel dimension：
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