LESHAN RADIO COMPANY, LTD.
1A Bipolar Linear Regulator
LR1117C
DESCRIPTION
LR1117C is a series of low dropout three terminal
-
regulators with a dropout of 1.3V at 1A load current.
LR1117C 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, LR1117C has an adjustable
version, which can provide an output voltage from
1.25 to 12V with only two external resistors.
LR1117C 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%
LR1117C 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
LR1117C
Vin
10uF
Vout
TYPICAL ELECTRICAL CHARACTERISTIC
LR1117C
Vin
Vout
Gnd
10uF
Application circuit of LR1117C fixed version
NOTE: Input capacitor (Cin=10uF) and Output
capacitor (Cout=10uF) are recommended in all
application circuit. Tantalum capacitor is
recommended.
Feb 2011 Ver1.2
1/10
LESHAN RADIO COMPANY, LTD.
ORDERING INFORMATION
LR1117C
X XX X
Temp. Range & Rohs Std.
X： 85C & Pb-free Rohs
Std,Output voltage accuracy
within
2％
Output Voltage：
12……1.2V
15……1.5V
18……1.8V
25……2.5V
33……3.3V
50……5.0V
……ADJ
Package Type：
S：SOT-223
D：TO-252
PIN CONFIGURATION AND MARKING
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
A：Manufacture weeks B：Manufacture LOT No.
C: Output Voltage Value
D: Temp. Range&Rohs Std
Marking information when ordering quantity is less than 200K
ABSOLUTE MAXIMUM RATING
Parameter
Max Input Voltage
Max Operating Junction Temperature(Tj)
Ambient Operating Temperature(Ta)
Package Thermal Resistance
SOT-223
TO-252
Storage Temperature(Ts)
Lead Temperature & Time
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 LR1117C -12V, the maximum input voltage for LR1117C-12V is 20V.
Feb 2011 Ver1.2
2/10
LESHAN RADIO COMPANY, LTD.
ELECTRICAL CHARACTERISTICS
Tj=25
C
Symbol
Vref
Parameter
Reference Voltage
Conditions
LR1117-ADJ
10mA≤Iout≤1A , Vin=3.25V
LR1117-1.2V
0≤Iout≤1A , Vin=3.2V
LR1117-1.5V
0≤Iout≤1A , Vin=3.5V
LR1117-1.8V
0≤Iout≤1A , Vin=3.8V
LR1117-2.5V
0≤Iout≤1A , Vin=4.5V
LR1117-3.3V
0≤Iout≤1A , Vin=5.3V
LR1117-5.0V
0≤Iout≤1A , Vin=7.0V
LR1117-12.0V
0≤Iout≤1A , Vin=14V
LR1117-1.2V
Iout=10mA, 2.7V≤Vin≤10V
LR1117-ADJ
Iout=10mA, 2.75V≤Vin≤12V
LR1117-1.5V
out=10mA, 3.0V≤Vin≤12V
LR1117-1.8V
Iout=10mA, 3.3V≤Vin≤12V
LR1117-2.5V
Iout=10mA, 4.0V≤Vin≤12V
LR1117-3.3V
Iout=10mA, 4.8V≤Vin≤12V
LR1117-5.0V
Iout=10mA, 6.5V≤Vin≤12V
LR1117-12.0V
Iout=10mA, 13.5V≤Vin≤20V
LR1117-1.2V
Vin =2.7V, 10mA≤Iout≤1A
LR1117-ADJ
Vin =2.75V, 10mA≤Iout≤1A
LR1117-1.5V
Vin=3.0V, 10mA≤Iout≤1A
LR1117-1.8V
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
Max
1.275
1.224
1.53
1.836
2.55
3.366
5.1
12.24
0.2
0.2
0.2
Unit
V
V
V
V
V
V
V
V
%/V
%/V
%/V
Vout
Output Voltage
ΔVout
Line Regulation
0.1
0.1
0.1
0.1
10
10
10
0.2
0.2
0.2
0.2
30
30
30
%/V
%/V
%/V
%/V
mV
mV
mV
ΔVout
Load Regulation
LR1117-2.5V
Vin=4.0V, 10mA≤Iout≤1A
LR1117-3.3V
Vin=4.8V, 10mA≤Iout≤1A
LR1117-5.0V
Vin=6.5V, 10mA≤Iout≤1A
LR1117-12.0V
Vin=13.5V, 10mA≤Iout≤1A
10
10
10
10
30
30
30
30
mV
mV
mV
mV
Feb 2011 Ver1.2
3/10
LESHAN RADIO COMPANY, LTD.
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
2
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
LR1117-ADJ
LR1117-1.2V, Vin =10V
LR1117-1.5V, Vin =11V
LR1117-1.8V, Vin =12V
Iq
Quiescent Current
LR1117-2.5V,Vin =12V
LR1117-3.3V, Vin =12V
LR1117-5.0V, Vin =12V
LR1117-12.0V, Vin =20V
LR1117-ADJ
Vin =5V, 10mA≤Iout≤1A
LR1117-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
136
92
°C/W
TO-252
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 LR1117C-ADJ will lead to unstable or oscillation output.
BLOCK DIAGRAM
Feb 2011 Ver1.2
4/10
LESHAN RADIO COMPANY, LTD.
DETAILED DESCRIPTION
LR1117C 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
LR1117C has an adjustable version and fixed versions (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V and 12V)
six
Fixed Output Voltage Version
LR1117C
Vin
10uF
Vin
Vout
Gnd
10uF
Vout
Application circuit of LR1117C fixed version
1)
2)
Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit.
Recommend using 10uF tan capacitor to assure circuit stability.
Adjustable Output Voltage Version
LR1117C-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
LR1117C
-ADJ
Vin
10uF
Vin
ADJ
R2
Vout
R1
Vout
10uF
Application Circuit of LR1117C-ADJ
The output voltage of adjustable version follows the equation: Vout=1.25(1+R2/R1)+IAdjR2. We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
Feb 2011 Ver1.2
5/10
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