Synchronous buck converters enhance efficiency in automotive PoL

Two synchronous buck converters from Diodes are targeted at automotive point of load (PoL) applications. The AP66200Q and AP66300Q cover a wide input voltage range from 3.8 to 60V. This allows 12, 24 and 48V-based automotive systems to be addressed. The converters have integrated power MOSFETs and are claimed to deliver high efficiency, step down conversion in vehicle powertrain, telematics, infotainment and lighting systems.

The low quiescent current of 40 microA for both the AP66200Q and AP66300Q meet the standby requirements of less than 100 microA associated with many automotive applications. In addition, they can be configured to operate in either pulse frequency modulation (PFM) or pulse width modulation (PWM) modes. When in PFM mode, improved efficiency will be achieved at light loads, said Diodes. Operation in PWM mode will result in low ripple across all loads.

Both devices have adjustable switching frequency capabilities (up to 2.5MHz) and can be synchronised to avoid beat frequency issues. Engineers can choose between high-efficiency operation or a smaller system design. The converters’ low on-state resistance values and enhanced efficiency modes enable a “substantial reduction” in internal power dissipation. The soft-start pin is programmable to reduce inrush current and can be employed for tracking multiple output voltages.

The AP66200Q and AP66300Q are AEC-Q100 Grade 1-qualified and manufactured in IATF 16949 certified facilities. They also support PPAP documentation. Both converters are supplied in compact 16-pin U-QFN4040-16/SWP (Type UXB) packages.

Diodes is a Standard and Poor SmallCap 600 and Russell 3000 Index company. It  delivers semiconductor products to companies in the automotive, industrial, computing, consumer electronics, and communications markets. Its product portfolio includes discrete, analogue and mixed-signal products and packaging technology to meet customers’ needs. The company’s range of application-specific solutions and solutions-focused sales is coupled with worldwide operations of 32 sites, including engineering, testing, manufacturing, and customer service.

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