MP3302 –40V, 1.3A, SINGLE-CELL STEP-UP WHITE LED DRIVER WITH SINGLE WIRE DIMMING CONTROL

MP3302 Rev. 0.98

www.MonolithicPower.com

4

5/5/2010

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PIN FUNCTIONS

TSOT23-5

Pin #

QFN8

Pin #

Name

Pin Function

1

8

SW

Power Switch Output. SW is the drain of the internal MOSFET switch. Connect

the power inductor and output rectifier to SW. SW can swing between GND

and 36V.

2

1, 5

GND,

Exposed

Pad

Ground. Connect exposed pad to GND plane for proper thermal performance.

3

6

FB

Feedback Input. The MP3302 regulates the voltage across the current sense

resistor between FB and GND. Connect a current sense resistor from the

bottom of the LED string to GND. Connect the bottom of the LED string to FB.

The regulation voltage is 200mV.

4

4

EN

ON/OFF Control and Dimming Command Input. A voltage greater than 0.6V

will turn the part on and less than 0.4V will turn the part off. If the EN pin

To use PWM dimming, apply a 200Hz to 1KHz square wave signal with

amplitude greater than 1.5V to this pin.

5

2

IN

Input Supply Pin. Must be locally bypassed.

3

NC

No Connect.