Low Voltage Automotive Buck Converter from Diodes Incorporated with Programmable PFM/PWM for Enhanced Efficiency

Diodes AP61100Q

Diodes Incorporated announced the AP61100Q, a 5.5 V, 1 A continuous output current, automotive-compliant, synchronous buck converter for point of load (POL) applications. With a fully integrated 110 mΩ high-side power MOSFET and 80 mΩ low-side power MOSFET, it provides high-efficiency step-down DC-DC conversion from 5 V and 3.3 V input rails. The converter has been developed for use in automotive applications including infotainment systems, instrumentation clusters, telematics, and advanced driver assistance systems (ADAS).

Diodes - AP61100Q

The AP61100Q offers design flexibility with 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, the AP61100Q delivers up to 89% efficiency at 5 mA light load and a low quiescent current of only 15 μA.

PFM Efficiency vs. Output Current
PFM Efficiency vs. Output Current.

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

The AP61100Q is qualified to AEC-Q100 Grade 1, supports PPAP documentation, and is manufactured in IATF 16949 certified facilities. The device is available in the SOT563 (1.6 mm × 1.6 mm) package priced at $0.185 in 3000 piece quantities.

JLCPCP: 2USD 2Layer 5PCBs, 5USD 4Layer 5PCBs

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