Preliminary Datasheet

LP3385

LP3385 – 00 Version 1.0 Datasheet

FEB.-2012

www.lowpowersemi.com

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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

(SOT23-6)

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

Cout

1uF

22uH

Cin

10uF

R1

15

Vin

VFB=300mV

PWM

EN

4

FB

3

Vin

6

OVP

5

U80

LP3385

Marking information

Part Number

Top Marking

Package

LP3385B6F

F8

SOT23-6

Other Information please view website:

www.lowpowersemi.com.