MP9928—4V TO 60V SYNCHRONOUS STEP-DOWN CONTROLLER

MP9928 Rev. 1.0

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14

5/20/2016

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TSSOP

Pin #

QFN

Pin #

Name

Description

17

15

BG

Bottom gate driver output. Connect this pin to the gate of the synchronous

N-channel MOSFET.

18

16

SW

bootstrapped switch.

19

17

TG

Top gate drive. The TG pin drives the gate of the top N-channel MOSFET.

The TG driver draws power from the BST capacitor and returns to SW pin,

providing a

true floating drive to the top N-channel MOSFET.

20

18

BST

Bootstrap. This pin is the positive power supply for the internal floating high

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

SW pin.

A diode from VCC1 to this pin charges the BST capacitor when the low

side switch is off.