System Description 4
miriac SBC-LS1028A User Manual
V 1.0
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© MicroSys Electronics GmbH 2019
Power Supply Structure
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Input power from ST9 / ST20 connector is fed to the primary step-down
converter.
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The primary step-down converter produces 5V DC / max. 8A peak from the
input supply which supplies both the MPX-LS1028A module and peripheral
devices on the carrierboard CRX07.
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The 5V DC are fed to a secondary step-down converter, which produces 3.3V
DC / max. 4A peak.
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Three NCP1529 produce 1.8V and 1.0V from +5V and 1.5V from 3.3V, which
are used for both PCIe and onboard devices.
The following diagram shows the power supply structure:
RTC Backup Battery
The RTC on the module is supplied from a 470mF supercap that is charged by the
5V power source on the carrier.
Figure 4-6 Power supply structure