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부품번호 | LC1117 기능 |
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기능 | 1A Bipolar Linear Regulator | ||
제조업체 | Leadchip semi | ||
로고 | |||
전체 10 페이지수
DESCRIPTION
LC1117 is a series of low dropout three-
terminal regulators with a dropout of 1.26V at
1A load current.
Other than a fixed version ( Vout =
1.2V,1.8V,2.5V,2.85V,3.3V,5V ) , LC1117
has an adjustable version, which can provide
an output voltage from 1.25 to 13.8V with
only two external resistors。
LC1117 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 ±1.5%(1.2V version is within
±2%).Other output voltage accuracy can be
customized on command, such as ±1% or ±2
%.
LC1117 is available in SOT-223,TO-252
power package。
TYPICAL APPLICATION
LC1117
REV1.0-Revised DEC 2007
1A Bipolar Linear Regulator
FEATURES
• Other than a fixed version and an
adjustable version, output value can be
customized on command.
• Maximum output current is 1A
• Range of operation input voltage: Max
15V
• Line regulation: 0.2%
• Load regulation: 0.4%
• Environment Temperature: -40℃~85℃
APPLICATIONS
• Power Management for Computer Mother
Board, Graphic Card
• LCD Monitor and LCD TV
• DVD Decode Board
• ADSL Modem
• Post Regulators for Switching Supplies
ELECTRICAL CHARACTERISTICS
Application circuit of LC1117 fixed version
NOTE: Input capacitor (Cin=10uF) and
Output capacitor (Cout=22uF) are
recommended in all application circuit.
Tantalum capacitor is recommended.
Load Regulation VS. Temp(Iout from10mA to1A)
1
0.5
0
-0.5
-1
-50
-25
0 25 50 75
Temperature(℃)
100 125 150
www.leadchip.com.cn
Copyright@2007, Leadchip semi
1
Your final power solution
Free Datasheet http://www.datasheet4u.com/
LC1117-ADJ
Vin-Vout=3V, 10mA≤Iout≤1A
LC1117-1.2V
Vin=3.0V, 0≤Iout≤1A
∆Vout
Load
Regulation
(note1, 2)
LC1117-1.8V
Vin=3.2V, 0≤Iout≤1A
LC1117-2.5V
Vin=3.9V, 0≤Iout≤1A
LC1117-2.85V
Vin=4.25V, 0≤Iout≤1A
LC1117-3.3V
Vin=4.75V, 0≤Iout≤1A
LC1117-5V
Vin=6.5V, 0≤Iout≤1A
Vin-Vout
Dropout
Voltage
(note3)
∆Vout, ∆Vref =1%,Iout=100mA
∆Vout, ∆Vref,=1%,Iout=500mA
∆Vout, ∆Vref,=1%,Iout=1A
Ilimit
Iq
Current Limit
Vin-Vout=2V, Tj=25℃
Minimum
Load Current
(note4)
Quiescent
Current
LC1117-ADJ
LC1117-1.2V,Vin-Vout=1.25V
LC1117-1.8V,Vin-Vout=1.25V
LC1117
0.2 0.4
%
8 20 mV
8 20 mV
8 20 mV
8 20 mV
8 20 mV
8 20 mV
1.11 1.2
V
1.18 1.25
V
1.26 1.3
V
1 1.2 1.4 A
5 10 mA
4 8 mA
4 8 mA
www.leadchip.com.cn
Copyright@2007, Leadchip semi
4
Your final power solution
Free Datasheet http://www.datasheet4u.com/
4페이지 LC1117
APPLICATION HINTS
• 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 200 Ω ~350 Ω ,the value of CAdj should satisfy this equation:
1/(2π*Fripple*Cadj)<R1. Recommend using 10uF tan capacitor.
OUTPUT VOLTAGE OF ADJUSTALBE VERSION
LC1117 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 LC1117 adjustable version
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
LC1117 is very large. LC1117 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.
www.leadchip.com.cn
Copyright@2007, Leadchip semi
7
Your final power solution
Free Datasheet http://www.datasheet4u.com/
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부품번호 | 상세설명 및 기능 | 제조사 |
LC1111 | LOW DROPOUT LINEAR REGULATOR CONTROLLER | Unisonic Technologies |
LC1117 | 1A Bipolar Linear Regulator | Leadchip semi |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |