MP2560 – 2.5A, 4MHz, 42V STEP-DOWN CONVERTER

MP2560 Rev. 1.2

www.MonolithicPower.com

4

1/25/2010

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PIN FUNCTIONS

QFN

Pin #

SOIC8

Pin #

Name

Description

1, 2

1

SW

Switch Node. This is the output from the high-side switch. A low forward drop

Schottky diode to ground is required. The diode must be close to the SW pins to

reduce switching spikes.

3

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.

4

3

COMP

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

compensation is applied to this pin.

5

4

FB

Feedback. This is the input to the error amplifier. The output voltage is set by a

equal to the internal +0.8V reference.

6

5

GND,

Exposed

Pad

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

shorten the high current switch paths. Connect exposed pad to ground plane.

7

6

FREQ

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

the switching frequency.

8, 9

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 switching spikes.

10

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.