MP2487 – 55V, 1A, HIGH-POWER LEDS DRIVER

MP2487 Rev. 1.0

www.MonolithicPower.com

4

9/22/2011

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PIN FUNCTIONS

Pin #

Name

Description

1

SW

rectifier to ground is required. The rectifier must be close to the SW pins to reduce

switching spikes.

2

EN

Enable Input. Pulling this pin below the specified threshold shuts the chip down.

Pulling it up above the specified threshold or leaving it floating enables the chip.

3

COMP

Compensation. This node is the output of the GM error amplifier. Control loop

frequency compensation is applied to this pin.

4

FB

Feedback. This is the input to the error amplifier. An external current sensing

resistor is connected in series with the LEDs to GND. The feedback voltage is

connected to this pin and is compared to the internal +200mV reference to set the

regulation current.

5

GND,

Exposed pad

Ground. It should be connected as close as possible to the output capacitor

avoiding the high current switch paths. Connect exposed pad to GND plane for

optimal thermal performance.

6

FREQ

Switching Frequency Program Input. Connect a resistor from this pin to ground to

set the switching frequency.

7

VIN

Input Supply. This supplies power to all the internal control circuitry, both BS

regulators and the high-side switch. A decoupling capacitor to ground must be

placed close to this pin to minimize the switching spikes.

8

BST

Bootstrap. This is the positive power supply for the internal floating high-side

MOSFET driver. Connect a bypass capacitor between this pin and SW pin.