Kontron MARS Smart Battery Kit - Manual (Page 19)

MARS User´s Guide
7. Output buck-boost converter
(Abbr.: BBout)
The output buck-boost converter is necessary to convert from higher and also lower voltages to
12V at the output side. It secures the 12V, even if there are batteries used with voltages lower than
12V.
The LTC3780 from Linear Technologies is used in the SBS MARS for this function. (see description
in chapter 6.)
7.1 Case where no Output buck-boost converter is necessary
7.1.1 Basic Conditions
If batteries are used, which voltage will always stay higher than 12V, then the control of the output
voltage can be done by the 2 nd path of the dual buck converter and the output buck-boost
converter can be omitted.
If it is possible that the voltage of the batteries drop below 12V, then the output buck-boost
converter must be used.
7.1.2 How to bypass the converter?
h Connect +V12_OUT to +V12_out_DB Æ alter Power Jumper from R87 to R88
h Don’t use R89 to avoid losses in the circuits of the converter. Alternativly the whole
circuit of the input buck-boost converter can be omitted.
h Populate R59 (bottom side) to activate the 2nd path of the dual buck converter
h Don’t use R160 (bottom side).
Output buck-boost converter
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