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LP3382S 데이터시트 PDF




Lowpowersemi에서 제조한 전자 부품 LP3382S은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 LP3382S 기능
기능 Constant Current Switching Regulator
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LP3382S 데이터시트, 핀배열, 회로
Preliminary Datasheet
LP3382S
High Performance, Constant Current Switching
Regulator For 8PCS White LED In Series
General Description
The LP3382S is a 1.2MHz PWM boost switching
regulator designed for constant- current white LED
driver applications. The LP3382S can drive a string
of up to 8 white LEDs in series, ensuring uniform
brightness and eliminating several ballast resistors.
The LP3382S implements a constant frequency
1.2MHz PWM control scheme. The high frequency
PWM operation also saves board space by reducing
external component sizes. To improve efficiency, the
feedback voltage is set to 250 mV, which reduces
the power dissipation in the current setting resistor.
Highly integration and internal compensation
network minimizes as 5 external component counts.
Optimized operation frequency can meet the
requirement of small LC filters value and low
operation current with high efficiency.
Ordering Information
LP3382S
F: Pb-Free
Package:
B6: SOT23-6
Features
High Efficiency: 92%  
1.2MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 29V
Operating Range : 2.7V to 5.5V
Shutdown Supply Current:<1uA  
Available in SOT23-6 Package  
Built-in 29V Over Voltage Protection  
Minimize the External Component
RoHS Compliant and 100% Lead (Pb)-Free
Applications
WLED Backlight driver
OLED Backlight driver
PDA
MID/PTV
Typical Application Circuit
Vin
Cin
10uF
4.7uH
Cout
2.2uF
6 Vin OVP 5
4 EN
FB 3
LP3382S
Panel
Pin Configurations
Rset
2
Marking information
Part Number
Top Marking Package
LP3382SB6F
F5
SOT23-6
Other Information please view website:
www.lowpowersemi.com.
(SOT23-6)
LP3382S – 00 Version 1.0 Datasheet OCT.-2012
www.lowpowersemi.com
Page 1 of 9




LP3382S pdf, 반도체, 판매, 대치품
Preliminary Datasheet
LP3382S
Absolute Maximum Ratings
Supply Input Voltage---------------------------------------------------------------------------------------------------0.3V to 6.0V
SW Input Voltage ---------------------------------------------------------------------------------------------------------0.3V to 35V
The Other Pins -----------------------------------------------------------------------------------------------------------0.3V to 5.5V
Power Dissipation, PD @ TA = 25°C SOT-23-6----------------------------------------------------------------------------0.455W
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------------- 280°C
Operation Temperature Range ------------------------------------------------------------------------------ 40°C to 80°C
Storage Temperature Range ----------------------------------------------------------------------------------- 65°C to 150°C
ESD Susceptibility
HBM(Human Body Mode) ---------------------------------------------------------------------------------------- 4KV
MM((Machine Mode)) -------------------------------------------------------------------------------------------- 200V
Electrical Characteristics
Parameter
System Supply Input
Operation voltage Range
Under Voltage Lock Out
Supply Current
Shut Down Current
Line Regulation
Oscillator
Operation Frequency
Maximum Duty Cycle
Feedback Voltage
MOSFET
On Resistance of MOSFET
SW Current Limit
Protection
OVP Threshold
OVP Sink Current
Shut Down Voltage
Enable on Voltage
Minimum EN Dimming
Threshold
Minimum EN Dimming
Threshold
PWM EN Dimming range
Symbol
Test Condition
VDD
VDD
IDD FB=0.2V, Switch
IDD VEN < 0.4V
VIN : 3.0~4.3V
FOSC
LP3382S
RDS(ON)
ILM
VOVP
VEN
VEN
VFB=0 V
VFB=250Mv
Min Typ. Max Units
2.7
2.4
90
0.1
2
1.2
93
250
6V
V
uA
1 uA
%
MHz
%
mV
0.3 Ω
2A
29
5
0.4
0.7
1.4
100
0.7
200K
V
μA
V
V
V
V
Hz
LP3382S – 00 Version 1.0 Datasheet OCT.-2012
www.lowpowersemi.com
Page 4 of 9

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LP3382S 전자부품, 판매, 대치품
Preliminary Datasheet
LP3382S
magnitude of the
selection of resistors in Figure 4 sets dimming
control of LED current from 20mA to 0mA.
PWM signal should be higher than the maximum
enable voltage of EN pin, in order to let the
dimming control perform correctly.
Vin
Cin
10uF
4.7uH
SS0520
Cout
1uF
Vin
Cin
10uF
4.7uH
SS14
PWM
0-1MHz
6 Vin OVP 5
4 EN
R2
100k
FB 3
LP3382S
Cout
1uF
ON/OFF
6 Vin OVP 5
4 EN
R4
100k
FB 3
LP3382S
R3
VDC
56K
R2
6.8K
R1
12
c. Using a Filtered PWM signal
R1 Another common application is using a filtered
12 PWM signal as an adjustable DC voltage for LED
dimming control. A filtered PWM signal acts as the
DC voltage to regulate the output current. The
recomended application circuit is shown in the
Figure 6. In this circuit, the output ripple depends
on the frequency of PWM signal. For smaller output
voltage ripple (<100mV), the recommended
frequency of 2.8V PWM signal should be above
2kHz. To fix the frequency of PWM signal and
change the duty cycle of PWM signal can get
different output current. According to the
application circuit of Figure 5, output current is
from 20.5mA to 5.5mA by adjusting the PWM duty
cycle from 10% to 90%.
b. Using a DC Voltage
Using a variable DC voltage to adjust the brightness
is a popular method in some applications. The
dimming control using a DC voltage circuit is
shown in Figure 4. According to the Superposition
Theorem, as the DC voltage increases, the voltage
contributed to VFB increases and the voltage drop
on R2 decreases, i.e. the LED current decreases. For
example, if the VDC range is from 0V to 2.8V, the
Vin
Cin
10uF
4.7uH
SS0520
6 Vin
OVP 5
Cout
1uF
ON/OFF
4 EN
FB 3
R4
100k
LP3382S
PWM
R69
(0-100KHz) 100K
R2
R3 6.8K
56K
C3
0.1uF
R1
15
LP3382S – 00 Version 1.0 Datasheet OCT.-2012
www.lowpowersemi.com
Page 7 of 9

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부품번호상세설명 및 기능제조사
LP3382S

Constant Current Switching Regulator

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