Power Solution for an Automotive Voltage Stabilizer (PMP7919)
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.
Mininum 5.5V input voltage supports US automotive cold cranking requirement Regulated 11.5V output when (battery) input is below 11.5V Operates in bypass mode when input voltage is higher than 11.5V Maximum 1.17V output voltage dip during simulated cold cranking tests High-side synchronous FETs can operate in 100% duty mode, saving extra bypass FETs. Synchronous operation saves power and eases thermal design.
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