MP1583 – 3A, 23V, 385KHz STEP-DOWN CONVERTER

MP1583 Rev. 3.1

www.MonolithicPower.com

4

6/20/2011

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2011 MPS. All Rights Reserved.

TYPICAL PERFORMANCE CHARACTERISTICS

5V/div.

2V/div.

1A/div.

MP1583-TPC02

Soft-Start

1.5A Resistive Load

5V/div.

2V/div.

1A/div.

MP1583-TPC03

5V/div.

2V/div.

1A/div.

1ms/div.

MP1583-TPC04

MP1583-TPC01

100

90

80

70

60

50

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5

LOAD CURRENT (A)

Efficiency Curve

PIN FUNCTIONS

Pin #

Name Description

1

BS

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

switch. Connect a 4.7nF or greater capacitor from SW to BS to power the high-side switch.

2

IN

Power Input. IN supplies the power to the IC. Drive IN with a 4.75V to 23V power source. Bypass

IN to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input

Capacitor

3

SW

Power Switching Output. SW is the switching node that supplies power to the output. Connect 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. (Note: For the SOIC8E package, connect the exposed pad on backside to Pin 4).

5

FB

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

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

6

COMP

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

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