Renesas ISL78264 and ISL78263 dual synchronous controllers

Renesas Electronics has announced a pair of 42 V dual synchronous controllers with integrated 2 A source/3 A sink MOSFET drivers that provide primary power stage solutions for the Renesas R-Car H3 and R-Car M3 SoCs.

The ISL78264 dual sync buck controller manages the intermediate first-stage DC/DC conversion, stepping down the 12 V battery system to 5 and 3.3 V to power the vehicle’s electronic control unit (ECU), in-vehicle infotainment (IVI) and digital cockpit systems with 50–200 W power levels. The ISL78263 dual sync boost and buck controller provides DC/DC conversion to support power levels of 25–100 W, while providing a pre-boost if the battery voltage (VBAT) dips to as low as 2.1 V during a cranking transient or a start/stop event.

The controllers offer low quiescent current (Iq) of 6 µA (typ) over a single buck channel. Both simplify power supply design by integrating FET drivers that can deliver 96% peak efficiency and >10 A output current. They also integrate feedback resistors and an external supply blocking diode for applications requiring cranking support, and programmable spread spectrum for addressing EMI interference challenges. Having built-in EMI mitigation, with a switching frequency up to 2.2 MHz, should also reduce the cost and size of EMI filtering/shielding.

The products include protection for overvoltage (OV), undervoltage (UV), overcurrent and overtemperature, with a bootstrap supply undervoltage detection and refresh circuit to protect the high-side MOSFET. They are AEC-Q100 Grade-1 qualified for ambient operation of -40 to +125°C.