Kontron MARS Smart Battery Kit - Manual (Page 17)

MARS User´s Guide
6. Input Buck-Boost Converter
(Abbr.: BBin)
The input buck-boost converter allows both low and high input voltages. This assures that the
charging voltage is always higher as battery voltage and a charging process is possible.
The LTC3780 from Linear Technologies is used in the SBS MARS for this function.
The characteristics of the IC are:
• Single Inductor Architecture Allows V
IN
above, below or equal to V
OUT
• Synchronous Rectification: Up to 98% Efficiency
• Current Mode Control
• Output Overvoltage Protection
The LTC3780 is a high performance buck-boost switching regulator controller that operates from
input voltages above, below or equal to the output voltage. The constant frequency current mode
architecture allows a phaselockable frequency of up to 400 kHz. With a wide 4V to 30V (36V
maximum) input and output range and seamless transfers between operating modes, the LTC3780
is ideal for automotive, telecom and battery-powered systems.
This converter also has the option to control the output current. For this reason it is possible to
increase the safety of the system.
6.1 Possible Configurations
6.1.1 Feed-in with 12V from an ATX power supply
This way of power supply offers the user the test possibility to check the behaviour in a surrounding
where 12V is available.
The 12V ATX power line for the buck-boost converter can be used, when a suitable power jumper on
R79 is populated and the jumper R211 and R80 are not connected.
You can use as a power jumpter e.g. an LRZ1206 from TT electronics.
6.1.2 Feed-in with 5V from an ATX power supply
This way of power supply offers the user the test possibility to check the behaviour in a surrounding
where 5V is available.
The 5V ATX power line for the buck-boost converter can be used, when a suitable power jumper on
R211 is populated and the jumper R79 and R80 are not connected.
You can use as a power jumpter e.g. an LRZ1206 from TT electronics.
Input Buck-Boost Converter
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