MP24971DN datasheet(4/14 Pages) MPS

4 / 14 page

MP24971 –1.5A, 50V, 100kHz, 5V FIXED OUTPUT STEP-DOWN CONVERTER

MP24971 Rev. 1.01

www.MonolithicPower.com

1/6/2012

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

PIN FUNCTIONS

Package

Pin #

Name

Description

VIN

Supply Voltage. Operates from an unregulated 8V-to-50V input. Requires decoupling

capacitor(s)—CIN—to limit voltage spikes. Drain of the internal power MOSFET; supplies

power to the whole chip.

GND

Exposed

Pad

Ground. Voltage reference of the regulated output voltage. GND node should be placed

outside of the diode-to-CIN ground path to prevent switching current spikes from inducing

voltage noise into the part. Connect exposed pad to GND plane for optimal thermal

performance.

VOS

Output Voltage Sense. Connect directly to the output.

VOC

Output Line Drop Compensator. Connect to GND through a resistor to compensate for the

output voltage drop.

ISN

Negative Current Sense Input. Used for limiting load current and for over-voltage

protection. Native 6V over-voltage protection threshold.

ISP

Positive Current Sense Input. Used for load current limiting.

BST

Bootstrap. Requires a capacitor to drive the power MOSFET gate above the supply

voltage. Connected capacitor between SW and BST pins to form a floating supply across

the power MOSFET driver. An on-chip regulator charges the external bootstrap capacitor.

If the on-chip regulator is not powerful enough, add a diode from VIN or VOUT to charge the

external boot-strap capacitor.

Switch Output. Output power supply.

MP24971DN 데이터시트(PDF) 4 Page - Monolithic Power Systems