Buck converter enhances efficiency with programmable PFM/PWM

Designed for automotive applications, the AP61100Q is a 5.5V, 1.0A continuous output current, automotive-compliant, synchronous buck converter for point of load (POL) applications, says Diodes. It has a fully integrated 110mOhm, high-side power MOSFET and 80mOhm low-side power MOSFET and provides high-efficiency step-down DC/DC conversion from 5.0V and 3.3V input rails.

The AP61100Q has a multi-functional programmable EN pin that enables the device to operate in forced pulse width modulation (PWM), where the frequency is constant across all loads, or in pulse frequency modulation (PFM). When in PFM mode, the AP61100Q delivers up to 89 per cent efficiency at 5mA light load and a low quiescent current of only 15 microA.

The buck converter has a wide output voltage range of 0.6V to 3.6V and operates at 2.2MHz to avoid AM radio band frequencies. By using constant on-time control, the buck converter can achieve fast transient response, easy loop stabilisation and low output voltage ripple, says Diodes.

The converter has been developed for use in a variety of automotive applications including infotainment systems, instrumentation clusters, telematics, and advanced driver assistance systems (ADAS).

The AP61100Q is qualified to AEC-Q100 Grade 1. It is available in the SOT563 (1.6 x 1.6mm) package and supports Production Part Approval Process (PPAP) documentation, and is manufactured in IATF 16949-certified facilities.

Diodes supplies semiconductor products to companies in the consumer electronics, computing, communications, industrial and automotive markets around the world. Its product portfolio includes discrete, analogue and mixed-signal products and packaging technology.

Diodes has 28 sites around the world, including engineering, testing, manufacturing, and customer service.


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