MP4566―36V, 1MHz, 0.6A, STEP-DOWN CONVERTER WITH 35μA QUIESCENT CURRENT

MP4566 Rev. 1.01

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4

9/22/2011

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PIN FUNCTIONS

Pin #

Name

Description

1

BIAS

Controller bias input. When Vbias>2.9V, this rail will supply current to the internal

circuitries.

2

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.

3

SW

ground is required close to this pin to reduce switching spikes.

4

VIN

Input Supply. This supplies power to all the internal control circuitry, both BST

regulators and the high side switch. A decoupling capacitor to ground is required

close to this pin to reduce switching spikes.

5

EN

Enable input. Pulling this pin below the specified threshold shuts the chip down.

Pulling it above the specified threshold enables the chip. Floating this pin

automatically keeps the MP4566 on.

6

GND

Ground. It should be connected as close as possible to the output capacitor avoiding

the high current switch paths.

7

FB

Feedback. This is the input to the error amplifier. An external resistive divider

connected between the output and GND is compared to the internal +1.0V reference

to set the regulation voltage.

8

NC

Not connected.