MP3301

—1.3MHZ, 700MA, FIXED-FREQUENCY, STEP-UP DRIVER FOR WHITE LEDS

MP3301 Rev. 1.01

www.MonolithicPower.com

4

10/28/2013

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PIN FUNCTIONS

Pin #

Name

Pin Function

1

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

GND

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

3

FB

Feedback Input. Used to regulate 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

EN

ON/OFF Control and Dimming Command Input. A > 0.6V turns the part on, and < 0.4V

between 0V and 200mV. To use PWM dimming, apply a 200Hz-to-1kHz square wave

signal with an amplitude >1.5V.

5

IN

Input Supply Pin. Requires local bypassing.