MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER

MP1584 Rev. 1.0

www.MonolithicPower.com

4

8/8/2011

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PIN FUNCTIONS

SOIC

Pin #

Name

Description

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.

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 error amplifier. Control loop frequency

compensation is applied to this pin.

4

FB

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

reference.

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 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

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.