MP3305 –36V, 1.3A, STEP-UP WHITE LED DRIVER WITH HIGH FREQUENCY TRUE PWM DIMMING & ADJUST OVP

MP3305 Rev. 1.0

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4

4/10/2013

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PIN FUNCTIONS

QFN8

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.

2,8

GND,

Exposed

Pad

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

3

IN

Input Supply Pin. Must be locally bypassed.

4

OVP

Open Load Protection Adjusting pin. Connect a resistor divider from output to this pin to

adjust the OVP threshold. When this pin voltage reaches the shutdown threshold 0.9V, the

switch will be turned off

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

MP3305 regulates the voltage across the current setting resistor. Tie a current setting

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