MP9141ES-Z データシートの表示（PDF） - Monolithic Power Systems

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MP9141ES-Z

1.8A Step-Down DC to DC Converter

Monolithic Power Systems 

MP9141 – 1.8A STEP-DOWN DC TO DC CONVERTER

MPS CONFIDENTIAL AND PROPRIETARY INFORMATION– INTERNAL USE ONLY

PIN FUNCTIONS

Pin # Name Description

1

BS

High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET

switch. Connect a 10nF or greater capacitor from SW to BS to power the switch.

Power Input. IN supplies the power to the IC, as well as the step-down converter switch. Drive

2

IN IN with a 4.75V to 20V power source. Bypass IN to GND with a suitably large capacitor to

eliminate noise on the input to the IC. See Input Capacitor.

Power Switching Output. SW is the switching node that supplies power to the output. Connect

3

SW the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS

to power the high-side switch.

4 GND Ground.

Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive

5

FB voltage divider from the output voltage. The feedback threshold is 1.222V. See Setting the

Output Voltage.

Compensation Node. COMP is used to compensate the regulation control loop. Connect a

6 COMP series RC network from COMP to GND to compensate the regulation control loop. See

Compensation.

7

EN

Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the

regulator, low to turn it off. For automatic startup, leave EN unconnected.

8

NC No Connect.

MP9141 Rev. 1.11

www.MonolithicPower.com

4

4/18/2011

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

© 2011 MPS. All Rights Reserved.

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