MP4462 – 3.5A, 4MHz, 36V STEP-DOWN CONVERTER

MP4462 Rev. 1.02

www.MonolithicPower.com

4

3/4/2013

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PIN FUNCTIONS

SOIC

Pin #

QFN

Pin #

Name

Description

1

1, 2

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.

2

3

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

4

COMP

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

compensation is applied to this pin.

4

5

FB

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

internal +0.8V reference.

5

6

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 GND plane for optimal thermal

performance.

6

7

FREQ

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

the switching frequency.

7

8, 9

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.

8

10

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.