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Smart OR-ing boost converter reference design for automotive eCall

Texas Instruments

This reference design is a smart OR-ing boost converter for automotive emergency call (eCall) applications utilizing a low quiescent current boost controller. The design uses two boost power stages driven by the same controller. The main battery input includes a bypass switch function. The backup battery input has a separate enable with disconnect switches. This combination allows for seamless crossover from the main battery to the backup battery.

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Features

Dual boost power stages allows for single controller operation440 kHz switching frequency: which is below the AM bandLow input voltage for operation during cold crankBypass switch for main battery reduces lossesAutomatic crossover to battery backup for glitch-free performance