Small footprint buck converters support high-efficiency automotive PoL applications

Diodes Incorporated has launched a series of automotive-compliant synchronous buck converters. With 2A and 3A current ratings, respectively, the AP6320xQ and AP6330xQ devices support a wide input voltage range, from 3.8V to 32V. They are suited for automotive PoL applications, including powertrains, telematics, instrumentation clusters, and infotainment systems. They can also help the performance of automotive body electronics and lighting, plus ADAS implementations.

The AP6320xQ devices integrate 125/68mOhm high/low-side power MOSFETs, and the AP6330xQ devices incorporate 70/40mOhm high/low-side power MOSFETs allowing them to provide high-efficiency step-down DC-DC conversion while keeping the external component count to a minimum. Adoption of peak current mode control and integrated loop compensation networks help streamline deployment.

The proprietary gate driver arrangement in these buck converters mitigates switching node ringing effects without lengthening MOSFET turn-on and turn-off times. This considerably lowers the high frequency radiated EMI noise associated with MOSFET switching.

The AP63200Q, AP63203Q, AP63205Q, and AP63300Q devices include a FSS function that helps relieve EMI. Also provided is a PFM mode that notably enhances light load efficiency levels. It allows a IQ of 22μA (typical), almost half that of most competing devices. This enhances conversion efficiency levels when under light load situations.

The AP63200Q, AP63201Q, AP63300Q, and AP63301Q support 500kHz switching frequencies. The AP63203Q and AP63205Q support 1100kHz, and their faster switching frequency permits smaller accompanying inductor and capacitor components. This enables further board space savings and an overall reduction in BOM costs.

The buck converter series are provided in compact TSOT26 packages, with each having an operational temperature range of -40C to +125C. UVLO, OVP, and thermal shutdown mechanisms are all included to provide ongoing reliability.