Diodes is aiming at automotive point-of-load converters with a 1A buck converter that can run from 5V and 3.3V rails. Output can span 600mV to 3.6V.

Diodes-AP61100Q-app

Called AP61100Q, the chip has synchronous rectification – with a 110mΩ high-side mosfet and 80mΩ low-side mosfet.

Operation is across 2.3 – 5.5V and -40 to +125°C (ambient, 150°C junction), as well as at 2.2MHz to avoid AM radio band frequencies.

Output voltage is set by a pair of external resistors, and an internal capacitor is provided (‘out’ pin) to increase ac feedback from the output.

Diodes-AP61100Q-efficiencyEfficiency with low-load PFM enabled

“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],” said Diodes. When in PFM, it delivers up to 89% efficiency at 5mA load and a quiescent current of only 15µA.”

The EN pin (see diags) can also shut the device down to a 100nA state.

Constant on-time control offers fast transient response and eases loop stabilisation.

Diodes-AP61100Q-blockQualification is to AEC-Q100 Grade 1, PPAP documentation is supported and manufacturing is in IATF 16949 certified facilities.

Packaging is 1.6 x 1.6mm SOT563.

A similar product, AP61102, does away with the internal feedback capacitor (and so needs 33pF externally) but adds a ‘power good’ output (diag right)

Applications are foreseen in infotainment systems, instrumentation clusters, telematics and driver assistance systems.