Description

The PMP7919 is a 2-phase synchronous boost converter that can take a minimum 5.5V input and put out 11.5V or higher at 15A. It is used in the Voltage Quality Module in a start-stop vehicle where warm cranking is not allowed to cause certain electronic loads (such as the head unit) to power cycle. When the start-stop vehicle goes through warm cranking: the lead acid battery voltage may dip to 6V (in the US) momentarily. The PMP7919 boost converter will: in this case: immediately respond to the transient so that its output voltage will stay in specifications: preventing downstream electronic loads from shutting down. When the battery voltage is higher than the boost converter's output regulation point (typically 11.5V): the synchronous boost converter will operate in bypass mode and leave the high-side FETs on 100%: saving extra bypass FETs and a control circuit that would be required if a non-synchronous boost converter were to be used.