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L99ASC03 Fully-Integrated Motor Driver IC for Three-Phase Brushless Motors Slide 19

A separate power supply input exists for the charge pump and the voltage regulator. The idea behind a separate supply for the voltage regulator is so that the capacitance inside the chip is minimized. The built in 660 nF capacitance allows for the device to operate under cold cranking or low voltage dropout conditions. However, since the dual-step charge pump requires more energy for switching the MOSFETs it has a dedicated power supply. What are the advantages and the benefits of having the dual-stage charge pump? The first is that there is enough energy to drive the gate of any of these six MOSFETs down to 6 V while staying in fully-enhanced RDS(on) mode. The continuous current capability of the gate driver is 30 mA, while transient capacity is up to half an amp. Due to this high driving capability, no external inductors or diodes are needed.

PTM Published on: 2015-04-06