What are the prominent differences between PAC5527 and PAC5523?
The PAC5527 features an integrated 48V charge pump DC/DC converter, which is specifically designed for high-performance battery-powered BLDC motor control applications up to 48V. This integrated charge pump supports the efficient operation of the motor controller by providing the necessary voltage levels for driving high-side and low-side gate drivers. The PAC5523, on the other hand, supports input voltages up to 70V but does not include a dedicated integrated charge pump like the PAC5527.
Wanted to add to the list of differences that PAC5526/27 integrates the DC/DC converter, considerably reducing component count and cost. For example, the PAC5523 can operate either on BUCK mode or SEPIC mode, while PAC5526/27 operates in Buck/Boost mode. PAC5526/27 requires a single inductor reducing the component count and cost required to form the entire DC/DC converter solution.
Parallel to this, PAC5526/27 has intelligent gate drive with programmable current drive strength. This allows the removal of the gate drive resistor required to current limit the gate drive into the N Channel MOSFET. Thanks to the aforementioned charge pump high side gate drive topology, we can also remove bootstrap diodes as well as bootstrap caps.
When comparing a typical three phase inverter with a PAC5523, a PAC5526/26 can provide the exact same level of power density, but with a Bill Of Material consisting of 25 less components. This also allows the entire solution to be packaged in a much smaller footprint.