LESHAN RADIO COMPANY, LTD.
1A Bipolar Linear Regulator
LR1117'
DESCRIPTION
FEATURES
LR1117 is a series of low dropout three- terminal
regulators with a dropout of 1.3V at 1A load current.
LR1117 features a very low standby current 2mA
compared to 5mA of competitor.
xOther than a fixed version and an adjustable
version, output value can be customized on
demand.
x Maximum output current : 1.4A
x Range of operation input voltage: Max 15V
x Standby current: 2mA (typ.)
x Line regulation: 0.03%/V (typ.)
x Load regulation: 0.2%/A (typ.)
x Environment Temperature: -40qC~85qC
Other than a fixed version, Vout = 1.2V, 1.8V, 2.5V,
2.85V, 3.3V, 5V, LR1117 has an adjustable version,
which can provide an output voltage from 1.2ϱsto
ϭϮV with only two external resistors.
LR1117 offers thermal shut down functions, to
assure the stability of chip and power system. And
it uses trimming technique to guarantee output
voltage accuracy within r2%. Other output voltage
accuracy can be customized on demand, such as
r1%
APPLICATIONS
x
Power Management for Computer Mother
Board, Graphic Card
BLD Monitor and BLD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
LR1117 is available in SOT-223, TO-252 power
package.
x
x
x
x
TYPICAL APPLICATION
TYPICAL ELECTRICAL CHARACTERISTIC
LR1117D
Vin
Vin
10uF
Vout
Vout
Gnd
LR1117
10uF
Application circuit of LR1117 fixed version
NOTE: Input capacitor (Cin=10uF) and Output
capacitor (Cout=10uF) are recommended in all
application circuit. Tantalum capacitor is
recommended.
Ver
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LESHAN RADIO COMPANY, LTD.
ORDERING INFORMATION
LR1117'X XXX
PIN CONFIGURATION AND MARKING
Pin Description˖
˖
Fixed Version
Temp. Range & Rohs Std.
X˖ 85C & Pb-free Rohs
Std,Output voltage accuracy
within r2ˁ
Pin No.
1
2
3
Output Voltage˖
12ĂĂ1.2V
18ĂĂ1.8V
25ĂĂ2.5V
28ĂĂ2.85V
33ĂĂ3.3V
50ĂĂ5.0V
ĂĂADJ
Symbol
Gnd
Vout
Vin
Definition
Ground
Output
Input
Adjustable Version
Pin No.
1
2
3
Package Type˖
S˖SOT-223
D˖TO-252
0DUNLQJ
'HVLJQDWRU
: 6
'FUU VV
:6
'F
UU
VV
Symbol Definition
Adj.
Adjustable
Vout
Output
Vin
Input
'HVFULSWLRQ
5
-?
$(A
;"'
'"$!
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
1ϴVc
150qC
-40qC – 85qC
20qC / W
10qC / W
-40qC - 150qC
260qC, 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. 1ϱV
-20qC –125qC
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LESHAN RADIO COMPANY, LTD.
ELECTRICAL CHARACTERISTICS
Tj=25qC
Symbol
Vref
Vout
ȴVout
Parameter
Reference Voltage
Output Voltage
Line Regulation
Conditions
LR1117D-ADJ
10mAчIoutч1A , Vin=3.25V
LR1117D-1.2V
0чIoutч1A , Vin=3.2V
LR1117D-1.8V
0чIoutч1A , Vin=3.8V
LR1117D-2.5V
0чIoutч1A , Vin=4.5V
LR1117D-2.85V
0чIoutч1A , Vin=4.85V
LR1117D-3.3V
0чIoutч1A , Vin=5.3V
LR1117D-5.0V
0чIoutч1A , Vin=7.0V
LR1117D-ADJ
Iout=10mA, 2.75VೇVinೇ12V
LR1117D-1.2V
Iout=10mA, 2.7VೇVinೇ10V
LR1117D-1.8V
out=10mA, 3.0VೇVinೇ12V
LR1117D-2.5V
Iout=10mA, 3.3VೇVinೇ12V
LR1117D-2.85V
Iout=10mA, 4.0VೇVinೇ12V
LR1117D-3.3V
Iout=10mA, 4.8VೇVinೇ12V
LR1117D-5.0V
Iout=10mA, 6.5VೇVinೇ12V
LR1117D-ADJ
Vin =2.75V, 10mAೇIoutೇ1A
LR1117D-1.2V
Vin =2.7V, 10mAೇIoutೇ1A
LR1117D-1.8V
Vin=3.0V, 10mAೇIoutೇ1A
LR1117D-2.5V
Vin=3.3V, 10mAೇIoutೇ1A
ȴVout
Load Regulation
LR1117D-2.85V
Vin=4.0V, 10mAೇIoutೇ1A
LR1117D-3.3V
Vin=4.8V, 10mAೇIoutೇ1A
LR1117D-5.0V
Vin=6.5V, 10mAೇIoutೇ1A
Min
Typ
Max
Unit
1.225
1.25
1.275
V
1.176
1.2
1.224
V
1.764
1.8
1.836
V
2.45
2.5
2.55
V
2.793
2.85
2.907
V
3.234
3.3
3.366
V
4.9
5
5.1
V
0.Ϭϯ
0.2
%/V
0.Ϭϯ
0.2
%/V
0.Ϭϯ
0.2
%/V
0.Ϭϯ
0.2
%/V
0.Ϭϯ
0.2
%/V
0.Ϭϯ
0.2
%/V
0.Ϭϯ
0.2
%/V
Ϯ
ϴ
mV
2
8
mV
3
12
mV
4
16
mV
5
20
mV
6
24
mV
9
36
mV
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LESHAN RADIO COMPANY, LTD.
ELECTRICAL CHARACTERISTICS continued
Tj=25qC
Symbol
Vdrop
SVR
Imin
Iq
IAdj
Parameter
Dropout Voltage
Supply Voltage Rejection
Minimum Load Current
Quiescent Current
Adjust Pin Current
Ichange
Iadj change
ȴV/ȴT
Temperature coefficient
Conditions
Min
Typ
Max
Unit
Iout=100mA
1.15
1.3
V
Iout=1A
1.3
1.5
V
60
f = 120Hz, VIN о VOUT = 3V + 1VPP Ripple
LR1117D-ADJ
dB
2
10
mA
LR1117D-1.2V, Vin =10V
1
2
5
mA
LR1117D-1.8V, Vin =11V
1
2
5
mA
LR1117D-2.5V, Vin =12V
1
2
5
mA
LR1117D-2.85V,Vin =12V
1
2
5
mA
LR1117D-3.3V, Vin =12V
1
2
5
mA
LR1117D-5.0V, Vin =12V
1
2
5
mA
35
55
120
uA
0.2
10
uA
LR1117D-ADJ
Vin =5V, 10mAೇIoutೇ1A
LR1117D-ADJ
Vin =5V, 10mAೇIoutೇ1A
±100
SOT-223
20
TJC
Thermal Resistance
TO-252
10
TJA
Thermal Resistance
Junction-to-Ambient
(No air flow)
SOT-223 (No heat sink)
136
TO-252 (No heat sink)
92
ppm
°C/W
°C/W
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 LR1117-ADJ will lead to unstable or oscillation output.
BLOCK DIAGRAM
4/
LESHAN RADIO COMPANY, LTD.
DETAILED DESCRIPTION
LR1117 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, 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
LR1117 has an adjustable version andsix fixed versions (1.2V, 1.8V, 2.5V, 2.85V, 3.3V, 5V )
Fixed Output Voltage Version
LR1117
Vin
Vin
10uF
Vout
Vout
10uF
Gnd
Application circuit of LR1117 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: 3mȍ ~ 22ȍ
Adjustable Output Voltage Version
LR1117-ADJ provides a1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable
by choosing two external resistors (schematic is shown below), R1 and R2
LR1117-ADJ
Vin
Vin
10uF
Vout
Vout
ADJ
R1
10uF
R2
Application Circuit of LR1117ͲADJ
The output voltage of adjustable version follows the equation: Vout=1.25u(1+R2/R1)+IAdjuR2. We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
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LESHAN RADIO COMPANY, LTD.
1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As LR1117-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 100ɏ~500ɏ, the value of CADJ should satisfy
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