MP2918 datasheet(15/30 Pages) MPS

15 / 30 page

MP2918

—4V TO 40V SYNCHRONOUS STEP-DOWN CONTROLLER

MP2918 Rev. 1.02

www.MonolithicPower.com

5/31/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

PIN FUNCTIONS (continued)

TSSOP-20

Pin #

QFN-20

Pin #

Name

Description

Bottom gate driver output. Connect BG to the gate of the synchronous

N-channel MOSFET.

Switch node. SW is the reference for the VBST supply and high-current

returns for the bootstrapped switch.

Top gate drive. TG drives the gate of the top N-channel synchronous

MOSFET. The TG driver draws power from the BST capacitor and returns

to SW, providing a

true ﬂoating drive to the top N-channel MOSFET.

BST

Bootstrap. BST is the positive power supply for the internal, floating, high-

side MOSFET driver. Connect a bypass capacitor between BST and SW.

A diode from VCC1 to BST charges the BST capacitor when the low-side

switch is off.

Exposed

pad

Exposed pad. The exposed pad is on the bottom side of the device. It is

not connected to SGND or PGND electrically. Connect the exposed pad to

SGND and PGND during PCB layout for better thermal performance.

MP2918 Datasheet(PDF) 15 Page - Monolithic Power Systems