EVM3805-QB-18-01A Datasheet, PDF (5/5 Pages) MPS Industries, Inc. – 6V, 0.6A Synchronous Step-Down Switcher Evaluation Board

EVM3805-QB-01A – 6V, 0.6A SYNC STEP-DOWN SWITCHER
QUICK START GUIDE (MODIFICATION FOR FIXED OUTPUT)
For modifying the EVM3805QB-01A to accommodate a fixed output voltage version of the
MPM3805GQB-12(-18,-25,-33) as the figure 6:
1. Carefully remove the IC (U1) and replace it with the corresponding fixed output version of the
MPM3805GQB-xx chip.
2. Remove both R1 and R2.
3. Connect the positive and negative terminals of the load to the VOUT and GND pins,
respectively.
4. Preset the power supply output between 2.5V and 6V, and then turn off the power supply.
5. Connect the positive and negative terminals of the power supply output to the VIN and GND
pins, respectively.
6. Turn the power supply on. The board will automatically start up. Fixed output versions are
shown in Table 1.
Table 1. Fixed output version information
Part Number
MPM3805GQB-12
MPM3805GQB-18
MPM3805GQB-25
MPM3805GQB-33
Fixed Vo (V)
1.2
1.8
2.5
3.3
LAYOUT RECOMMENDATION OF MPM3805
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.
NOTICE: The information in this document is subject to change without notice. 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.
EVM3805-QB-01A Rev.1.2
www.MonolithicPower.com
5
10/18/2013
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