MP2480 – 36V INPUT, 3A HIGH POWER LED DRIVER

MP2480 Rev. 1.01

www.MonolithicPower.com

4

1/25/2013

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PIN FUNCTIONS

SOIC8-EP

Pin #

Name

Description

1

SW

Place the rectifier close to the SW pins to reduce switching spikes.

2

DIM

PWM Dimming Input. Pull this pin below the specified threshold to turn dimming off. Pull

this pin above the specified threshold to turn dimming on. If there is no need for

dimming, connect DIM and EN pins together.

3

EN

Enable Input. Pull this pin below the specified threshold to shutdown the chip. Pull this

pin up above the specified threshold or leave it floating to enable the chip.

4

GND,

Exposed

pad

Ground. Connect as close as possible to the output capacitor. Avoid the high-current

switching paths. Connect exposed pad to GND plane for optimal thermal performance.

5

FB

Feedback. Input to hysteretic comparators. Connect an external current sensing resistor

in series with the LEDs to GND. Connects with the feedback voltage; regulated at

+200mV with 25% ripple.

6

NC

Not connected

7

VIN

Input Supply. Supplies power to all the internal control circuitry, including both bootstrap

regulators and the high-side switch. Place a decoupling capacitor to ground close to this

pin to minimize switching spikes.

8

BST

Bootstrap. Positive power supply for the internal floating high-side MOSFET driver.

Connect a bypass capacitor between this pin and SW pin.