MP3304 –36V, 1.3A, STEP-UP WHITE LED DRIVER WITH HIGH FREQUENCY TRUE PWM DIMMING

MP3304 Rev. 0.91

www.MonolithicPower.com

4

4/19/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

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

(MP3304A), 24V (MP3304B) or 18V (MP3304C).

2

PGND

Power Ground.

3

IN

Input Supply Pin. Must be locally bypassed.

4

N/C

No Connect.

5

EN

ON/OFF Control and Dimming Command Input. Holding EN pin low for more than

5ms will turn the part off. To use PWM dimming, add a 250Hz to 50KHz square

wave signal to this pin.

6

LED

LED Current Input. This pin is the open-drain output of an internal dimming control

switch. Connect the LED cathode to this pin.

7

ISET

LED Current Set. This pin is the source output of an internal dimming control switch.

The MP3304 regulates the voltage across the current setting resistor. Tie a current

setting resistor from this pin to ground. The regulation voltage is 200mV.

8

GND,

Exposed Pad

Ground. Connect Exposed Pad to GND plane for optimal thermal performance.