Power Electronics / Power Management


Dual buck and boost-buck controllers

30 September 2020 Power Electronics / Power Management

Renesas has introduced the ISL78264 Dual Buck and ISL78263 Boost-Buck controllers, which draw the industry’s lowest 6 µA quiescent current under light load and can achieve 96% power efficiency.

The ISL78264 Dual Sync Buck Controller manages the intermediate first stage DC/DC conversion, stepping down the 12 V battery system to 5 V and 3,3 V to power the vehicle’s electronic control unit (ECU), in-vehicle infotainment (IVI) and digital cockpit systems with 50 W-200 W power levels. The ISL78263 Dual Sync Boost and Buck controller provides DC/DC conversion to support power levels of 25 W–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.

Both controllers offer an energy conserving low quiescent current (Iq) of 6 µA (typ) over a single buck channel. The controllers simplify power supply design by integrating FET drivers that can deliver industry leading 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 a programmable spread spectrum for addressing EMI interference challenges. Having built-in EMI mitigation, with a switching frequency up to 2,2 MHz, also reduces the cost and size of EMI filtering/shielding.

Key features of the ISL78264 Dual Sync Buck controller involve an input voltage operation of 3,75 V to 42 V; buck1 Vout is fixed at 3,3 V/5 V or adjustable from 0,8 V to 5 V; buck2 Vout is adjustable from 0,8 V to 32 V; low Iq of 6 µA (typ) over a single buck channel; 25 ns on-times for low duty-cycle operation and 180° phase shift between channels; and supports start-stop cranking transients down to 5,5 V @ 2 MHz without requiring pre-boost.

Key features of the ISL78263 Dual Sync Boost and Buck controller involve an input voltage operation from 2,1 V to 42 V; fixed buck at 3,3 V/5 V adjustable; keeps buck output in regulation through cold-crank transients down to 2,1 V; boost frequency at 1x or 0,2x the buck frequency; drop-out mode (buck) for high duty-cycle operation; and 25 ns on-times for low duty-cycle operation.

For more information contact Jody Botha, Hi-Q Electronics, +27 11 894 8083, jody@hi-q.co.za, www.hi-q.co.za


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