MPQ2451―INDUSTRIAL-GRADE 36V, 2MHz, 0.6A, STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED

MPQ2451 Rev 1.02

www.MonolithicPower.com

4

5/3/2013

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PIN FUNCTIONS

SOT23-6L

Pin #

QFN-6L

Pin #

Name

Description

1

6

BST

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

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

pin.

2

5

GND

Ground. Connect the output capacitor as close to this pin as possible.

Avoid routing near high-current switch paths.

3

4

FB

Feedback. Input to the error amplifier. Connected to an external resistive

divider between output and GND; compared against the internal 0.8V

reference to set the regulation voltage.

4

3

EN

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

down. Pull it above the specified threshold to enable the chip. Float this

pin to disable the chip.

5

2

VIN

Input Supply. Supplies power to all internal control circuitry; both BS

regulators and the high side switch. Requires a decoupling capacitor to

ground close to this pin to reduce switching spikes.

6

1

SW

diode to ground close to this pin to reduce switching spikes.