MP4568

―60V, 100mA, SYNCHRONOUS STEP-DOWN CONVERTER

MP4568 Rev. 1.01

www.MonolithicPower.com

8

8/18/2013

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PIN FUNCTIONS

Pin #

Name

Description

1

BST

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

Connect a bypass capacitor between this pin and SW pin.

2

SW

Switch Node. Output from the high-side switch and internal Schottky diode.

3

GND

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

paths.

4

BIAS

LS driver when VBIAS>4.5V.

5

FB

Feedback. Input to the error amplifier. 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

ILIM

Peak Current Limit. A resistor from ILIM to GND sets the peak current limit.

7

SS

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

8

ENHY

EN Indicator Open Drain Output. Goes low when EN falls below 1.2V.

9

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.

10

IN

Input Supply. Requires a decoupling capacitor to ground to reduce switching spikes.