LP3385 Datasheet, PDF (1/9 Pages) Lowpower Semiconductor inc – 1.2MHzFixed-Frequency PWM Operation

Preliminary Datasheet
LP3385
High Performance, Constant Current Switching
Regulator For 39PCS White LED Driver
General Description
The LP3385 is a 1.2MHz PWM boost switching
regulator designed for constant- current white LED
driver applications. The LP3385 can drive a string of
up to 10 white LEDs in series, ensuring uniform
brightness and eliminating several ballast resistors.
The LP3385 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 300 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
LP3385
F: Pb-Free
Package:
B6: SOT23-6
Pin Configurations
Features
High Efficiency: 92% 　
1.2MHzFixed-Frequency PWM Operation
Maximum Output Voltage up to 36V
Operating Range : 2.7V to 6V
Shutdown Supply Current:<1uA 　
Available in SOT23-6 Package 　
Built-in 36V 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
22uH
U80
Cout
1uF
6 _{Vin OVP} 5
PWM
4 _EN
FB ³
LP3385
VFB=300mV
R1
15
(SOT23-6)
Marking information
Part Number
Top Marking Package
LP3385B6F
F8
SOT23-6
Other Information please view website:
www.lowpowersemi.com.
LP3385 – 00 Version 1.0 Datasheet FEB.-2012
www.lowpowersemi.com
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