MP24943DN datasheet(4/13 Pages) MPS

4 / 13 page

MP24943 –3A, 55V, 100kHz STEP-DOWN CONVERTER

MP24943 Rev. 0.83

www.MonolithicPower.com

12/11/2013

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

PIN FUNCTIONS

Package

Pin #

Name

Description

VIN

Supply Voltage. Unregulated input can range from 4.5V to 55V. Input capacitor (CIN)

required to decouple input. Provides drain for internal power device and power supply.

GND,

Exposed

Pad

Ground. Voltage reference for the regulated output voltage. Layout requires special

attention: this node must be placed outside of the D1-to-CIN ground path to prevent

current spikes from inducing voltage noise. Connect exposed pad to GND plane for

optimal thermal performance.

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

above the specified threshold enables the chip.

Feedback. Use an external resistor divider from VOUT to GND tapped to the FB pin to set

the output voltage.

Soft-Start. Connect to an external capacitor for Soft-Start.

Output Over-Voltage Protection. Connect VO to the tap of an external resistor divider

from VOUT to GND. The OVP reference is 0.9V.

BST

Bootstrap. Requires a capacitor to drive the power switch’s gate above the supply

voltage. Connect this capacitor between SW and BST pins to form a floating supply

across the power switch driver. An on-chip regulator charges up the bootstrap

capacitor. If the on-chip regulator is not strong enough, one optional diode can be

connected from VIN or VOUT to charge the external boot-strap capacitor.

Switch Output. Output supply.

MP24943DN Datasheet(PDF) 4 Page - Monolithic Power Systems