More Bang for Your Boost: Driving Heavier Loads with Lower Battery Voltages
Bootstrapping is a technique that can be applied to most boost converters and enables the converter to run down to a lower voltage while still driving heavy loads. Many portable designs require a boost converter to convert a low battery voltage into something higher, but as the battery voltage decays, the drive to the boost converter’s FET is reduced and can sometimes reduce the current available to the output. Bootstrapping overcomes this problem and buys extra battery life while increasing the efficiency at heavy loads.
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