BL1117
1A Bipolar Linear Regulator
DESCRIPTION
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%
BL1117 is available in SOT-223, TO-252 power
package.
FEATURES
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: -40C~85C
APPLICATIONS
Power Management for Computer Mother
Board, Graphic Card
BLD Monitor and BLD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
TYPICAL APPLICATION
LC1117
BL1117
Vin
10uF
Vout
TYPICAL ELECTRICAL CHARACTERISTIC
BL1117
Vin
Vout
Gnd
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
BL1117-XX
X X
Package Type：
X：SOT-223
Y：TO-252
PIN CONFIGURATION
Pin Description：
Fixed Version
Pin No.
1
2
3
Symbol
GND
Vout
Vin
Definition
Ground
Output
Input
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％
Adjustable Version
Pin No.
1
2
3
A：
Means assembly year and weeks
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
Output Voltage：
12……1.2V
15……1.5V
18……1.8V
25……2.5V
33……3.3V
50……5.0V
Default：Adjustable Version
Year
Y
2010
0
2011 2012 2013 …
1
…
26
…
Z
2
3
…
53
A
Week 1 2
W
A B
27
…
52
…
ABSOLUTE MAXIMUM RATING
Parameter
Max Input Voltage
Max Operating Junction Temperature(Tj)+
Ambient Temperature(Ta)
Package Thermal Resistance
SOT-223
TO-252
Storage Temperature(Ts)
Lead Temperature & Time
B：Means Manufacture LOT No.
C：Means Output Voltage Value
D：Means Temp. Range&Rohs Std
Value
15V
150C
-40C – 85C
20C / W
10C / W
-40C - 150C
260C, 10S
Note: Exceed these limits to
damage to the device.
Exposure
to
absolute
maximum rating conditions
may affect device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Input Voltage Range
Operating Junction Temperature(Tj)
Value
Max. 12V
-20C –125C
Exceptional for BL1117-12V, the maximum input voltage for BL1117-12V is 20V.
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BL1117
ELECTRICAL CHARACTERISTICS+
Tj=25
C
Symbol
Vref
Parameter
Reference Voltage
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
BL1117-1.8V
Vin=3.3V, 10mA≤Iout≤1A
Min
1.225
1.176
1.47
1.764
2.45
3.234
4.9
11.76
Typ
1.25
1.2
1.5
1.8
2.5
3.3
5
12
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
10
10
10
10
10
10
10
10
Max
1.275
1.224
1.53
1.836
2.55
3.366
5.1
12.24
0.2
0.2
0.2
0.2
0.2
0.2
0.2
0.2
30
30
30
30
30
30
30
30
Unit
V
V
V
V
V
V
V
V
%/V
%/V
%/V
%/V
%/V
%/V
%/V
+%/V
mV
mV
mV
mV
mV
mV
mV
mV
Vout
Output Voltage
ΔVout
Line Regulation
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
Vdrop
Ilimit
SVR
Imin
Parameter
Dropout Voltage
Current Limit
Supply Voltage Rejection
Minimum Load Current
Iout=100mA
Iout=1A
Conditions
Min
Typ
1.23
1.3
Max
1.3
1.5
Unit
V
V
A
Vin-Vout=2V, Tj=25°C
f = 120Hz, VIN − VOUT = 3V + 1VPP Ripple
1
60
4
1
1
1
1
1
1
1
35
6
2
2
2
2
2
2
2
55
0.2
±100
10
5
5
5
5
5
5
5
120
10
dB
mA
mA
mA
mA
mA
mA
mA
mA
uA
uA
ppm
°C/W
BL1117-ADJ
BL1117-1.2V, Vin =10V
BL1117-1.5V, Vin =11V
BL1117-1.8V, Vin =12V
Iq
Quiescent Current
BL1117-2.5V,Vin =12V
BL1117-3.3V, Vin =12V
BL1117-5.0V, Vin =12V
BL1117-12.0V, Vin =20V
BL1117-ADJ
Vin =5V, 10mA≤Iout≤1A
BL1117-ADJ
Vin =5V, 10mA≤Iout≤1A
SOT-223
IAdj
Ichange
ΔV/ΔT
JC
Adjust Pin Current
Iadj change
Temperature coefficient
Thermal Resistance
Thermal Resistance
Junction-to-Ambient
(No air flow)
20
10
4.5
136
92
°C/W
TO-252
TO-220
SOT-223 (No heat sink)
TO-252 (No heat sink)
JA
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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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
10uF
Vin
Vout
Gnd
10uF
Vout
Application circuit of BL1117 fixed version
1)
2)
3)
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.
Capacitor ESR range: 3mΩ ~ 22Ω
Adjustable Output Voltage Version
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