Diodes AP61204Q Buck Converter For Automotive Power Rails

Automotive systems continue to pile on new electronics, from infotainment units to ADAS modules. Each relies on clean point-of-load power, and space on the board is always at a premium. That is where Diodes new AP61204Q comes in.

The device is a 2 A synchronous buck converter that runs from 2.4 V to 5.5 V, covering both 3.3 V and 5 V rails. It integrates 70 mΩ high-side and 50 mΩ low-side MOSFETs, helping it achieve efficient step-down conversion in a footprint no larger than a standard SOT563 package.

Features That Stand Out

What makes the AP61204Q interesting is the mix of automotive-grade reliability with a feature set that reduces external parts and keeps design simple:

• Constant on-time (COT) control for fast transient response and low ripple
• 19 µA quiescent current to boost light-load efficiency
• PWM/PFM mode select through an enable pin, giving engineers a choice between fixed frequency and higher efficiency at low loads
• Power-good (PG) output with ±5% accuracy, useful for sequencing and fault monitoring
• 2.4 MHz switching frequency that keeps inductors and capacitors small
• Soft output discharge to prevent residual charge on the rail

The part is also AEC-Q100 qualified and manufactured in IATF 16949-certified facilities, with PPAP support for automotive customers.

Where It Fits

Diodes is positioning the AP61204Q for point-of-load rails in infotainment, instrument clusters, telematics, and ADAS. By offering it in the same pin-compatible family as its 600 mA, 1 A, and 3 A devices, engineers can scale current capability without redesigning their board layout.

Final Thoughts

Step-down converters are everywhere in cars, but package size, efficiency, and qualification often make or break the choice. The AP61204Q brings a small package, low quiescent current, and proven automotive compliance, giving designers a part that is straightforward to integrate into space-constrained systems.

Learn more and read the original announcement here. Access the datasheet here.