EV2145-D-00A – 6A, 5.5V, 1.2MHZ, SYNC STEP-DOWN SWITCHER

NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.

Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS

products into any application. MPS will not assume any legal responsibility for any said applications.

EV2145-D-00A Rev.1.0

www.MonolithicPower.com

8

8/14/2014

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

© 2014 MPS. All Rights Reserved.

QUICK START GUIDE

1. Connect the positive and negative terminals of the load to the VOUT and GND pins,

respectively.

2. Preset the power supply output between 2.8V and 5.5V, and then turn off the power supply.

3. Connect the positive and negative terminals of the power supply output to the VIN and GND

pins, respectively.

4. Turn the power supply on. The board will automatically start up.

5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 1.2V to turn

on the regulator or less than 0.4V to turn it off.

LAYOUT RECOMMENDATION OF MP2145

Proper layout of the switching power supplies is very important, and sometimes critical to make it work

properly. Especially, for the high switching converter, if the layout is not carefully done, the regulator

could show poor line or load regulation, stability issues.

For MP2145, the high speed step-down regulator, the input capacitor should be placed as close as

possible to the IC pins. As shown in Figure 6, the 0805 size ceramic capacitor is used, please make

sure the two ends of the ceramic capacitor be directly connected to PIN 8 (the Power Input Pin) and

PIN 10/11/12 (the Power GND Pin).

1

4

10

9

37

6

12

SW

OUT

RAMP

FB

VIN

SW

VIN

PG

EN

MODE/

VCON

GND GNDGND

5

28

11

Cin

Cout

R1

R2

GND

Pin10,11,12

(PGND )

Pin8

(VIN )

Lout

Figure 6— Two ends of Input decoupling Capacitor close to Pin 8 and Pin 10/11/12