MP1482 Просмотр технического описания (PDF) - Monolithic Power Systems

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MP1482

2A, 18V Synchronous Rectified Step-Down Converter

Monolithic Power Systems 

MP1482 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER

PIN FUNCTIONS

SOIC8

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 0.01μF or greater capacitor from SW to BS to power the high side switch.

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

2

IN Drive IN with a 4.75V to 18V 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 to regulate that voltage. Drive FB with a resistive

5

FB voltage divider from the output voltage. The feedback threshold is 0.923V. 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. In some

cases, an additional capacitor from COMP to GND is required. See Compensation

Components.

7

EN

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

regulator, drive it low to turn it off. Pull up with 100kΩ resistor for automatic startup.

Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS to GND

8

SS to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To disable the

soft-start feature, leave SS unconnected.

MP1482 Rev. 1.31

www.MonolithicPower.com

4

7/9/2012

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

© 2012 MPS. All Rights Reserved.

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