MSK MSK5031 User Manual

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Application Note 017
MSK5031 Evaluation Board User's Guide
By Bob Abel & Paul Musil, MSK; Revised 1/13/15
Introduction
The MSK5031 is a 200KHz to 2.4MHz step-down switching regulator controller with a high
efficiency integrated switch. Synchronized or fixed high frequency switching coupled with
wide input and output voltage ranges allows the designer to minimize the required board
space for supporting components. With no load quiescent currents typically less than 100uA
efficiency remains high at light loads. The shutdown circuitry allows the user to further
reduce the input voltage supply current to less than 1uA. The MSK5031 is packaged in a
hermetically sealed 16 pin flatpack and is available with a straight or gull wing lead form.
The evaluation board provides a platform from which to evaluate new designs with ample
real estate to make changes and evaluate results. Evaluation early in the design phase
reduces the likelihood of excess ripple, instability, or other issues, from becoming a problem
at the application PCB level.
This application note is intended to be used in conjunction with the MSK5031 data sheet
and the LT3480 data sheet. Reference those documents for additional application
information and specifications.
Setup
Use the standard turret terminals to connect to your power supply and test equipment.
Connect a power supply across the Vin and GND terminals (see note 1). Connect the output
1
load between the VOUT and GND terminals. Use separate or Kelvin connections to
2
connect input and output monitoring equipment. When measuring output ripple voltage with
an oscilloscope probe, the wire from the probe to the ground clip will act as an antenna,
picking up excessive noise. For improved results, the test hook should be removed from the
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