MP4569―75V, 0.3A, SYNCHRONOUS STEP-DOWN CONVERTER

MP4569 Rev. 1.0

www.MonolithicPower.com

5

9/12/2014

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PIN FUNCTIONS

Pin #

QFN-10

(3mmx3mm)

Pin #

SOIC-8 EP

Name Description

1

1

GND

Ground. Connected the output capacitor as close as possible to avoid high-

current switch paths.

2

2

IN

Input Supply. Requires a decoupling capacitor to ground to reduce

switching spikes.

3

3

EN

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

Pull it above the high threshold enables the chip. Float this pin to shut the

chip down.

4

No

Bonding

VREF Reference Voltage Output, for QFN-10 (3mmx3mm) package only.

5

4

FB

Feedback Connected to the tap of an external resistive divider between the

output and GND. Sets the regulation voltage when compared to the internal

1V reference.

6

5

SS

Soft-Start Control Input. Connect a capacitor from SS to GND to set the

soft-start period.

7

No

Bonding

POK

Open Drain Power Good Output. “HIGH” output indicates VOUT is higher

than 90% of reference. POK is pulled down in shutdown, for QFN-10

(3mmx3mm) package only

8

6

BIAS

Controller Bias Input. Supplies current to the internal circuit when

9

7

BST

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

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

10

8

SW

Switch Node.