Preliminary Datasheet
LP3383
High Performance, Constant Current Switching Regulator
General Description
The LP3383 is a 1MHz PWM boost switching regulator
designed for constant- current white LED driver
applications. The LP3383 can drive a string of up to 8
white LEDs in series, ensuring uniform brightness and
eliminating several ballast resistors. The LP3383
implements a constant frequency 1MHz 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 300mV, 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.
Features
High Efficiency: 92%
1MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 29V
Operating Range : 2.2V to 6V
Shutdown Supply Current:<1uA
Available in SOT23-6 Package
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
4.7uH
Cin
10uF
6
1
LX
5
Cout
2.2uF
Order Information
LP3383
□ □ □
F: Pb-Free
Vin
OVP
4
Package Type
B6: SOT23-6
EN
2
GND
FB
3
LP3383
R1
2
Marking information
Device
LP3383
Marking
Package
SOT23-6
Shipping
3K/REEL
LP3383-04
May.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 1 of 9
Preliminary Datasheet
Functional Pin Description
Package Type
Pin Configurations
IN
OUT
EN
LP3383
6
5
4
SOT23-6
1
2
3
LX
GND
FB
SOT-23-6
Pin Description
Pin
1
2
3
Name
SW
GND
FB
Description
Switch Pin. Connect this Pin to inductor and catch diode. Minimize the track area to reduce
EMI.
Ground Pin
Feedback Reference Voltage Pin. Series connect a resistor between WLED and ground as a
current sense. Sense the current feedback voltage to set the current rating.
Chip Enable (Active High). Voltage sensing input to trigger the function of over voltage
4
5
6
EN
OVP
Vin
protection. Note that this pin is high impedance. There should be a pull low 100kΩ resistor
connected to GND when the control signal is floating.
Over voltage pin.
Supply Input Voltage Pin. Bypass 10uF capacitor to GND to reduce the input noise.
LP3383-04
May.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 2 of 9
Preliminary Datasheet
Function Block Diagram
LP3383
Absolute Maximum Ratings
Supply Input Voltage ------------------------------------------------------------------------------------------ -0.3V to 7V
SW/OVP Pin to GND ---------------------------------------------------------------------------------------- -0.3V to 35V
The Other Pins -------------------------------------------------------------------------------------------------- -0.3V to 7V
Power Dissipation, PD @ TA = 25°C SOT-23-6 ------------------------------------------------------------- 0.45W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
Operation Temperature Range ------------------------------------------------------------------------- -20°C to 80°C
Storage Temperature Range --------------------------------------------------------------------------- -65°C to 150°C
ESD Susceptibility
HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV
MM(Machine Mode) --------------------------------------------------------------------------------------------------- 200V
LP3383-04
May.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 3 of 9
Preliminary Datasheet
LP3383
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
PWM EN Dimming range
VEN
VEN
1.4
100
100K
VOVP
29
5
0.4
V
μA
V
V
Hz
RDS(ON)
ILM
0.3
2
0.5
Ω
A
FOSC
90
300
1
MHz
%
mV
VDD
VDD
IDD
IDD
FB=0.35V, no Switch
VEN < 0.4V
VIN : 3.0~4.3V
2.2
1.8
450
0.1
2
550
1
6
V
V
uA
uA
%
Symbol
Test Condition
Min
Typ.
Max
Units
LP3383-04
May.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 4 of 9
Preliminary Datasheet
Typical Operating Characteristics
LP3383
LP3383-04
May.-2014
Email:
marketing@lowpowersemi.com
www.lowpowersemi.com
Page 5 of 9
