Programmable buck converter enables in-field configuration and status reporting
The Diodes Incorporated AP61406Q synchronous buck converter uses an I2C interface to adjust operating mode, switching frequency, current limit, and output voltage during operation, while reporting power-good and fault status.
The AP61406Q is a 2.3V to 5.5V input, 4A automotive-compliant synchronous buck converter with an I2C interface intended for configurable point-of-load rails. Configuration is handled through status and setting registers, allowing parameters to be changed during system operation rather than being fixed by external component selection.
Flexibility is provided through programmable operating mode selection, pulse-frequency modulation (PFM) or forced PWM, and selectable switching frequencies of 1MHz, 1.5MHz, 2MHz, or 2.5MHz. Output current limit is programmable in discrete steps of 1A, 2A, 3A, or 4A, and output voltage is adjustable from 0.3V to 3.6V in 20mV increments. This flexibility allows a single converter to be used across multiple rails or system states, including low-load standby and peak-load operating modes.
The I2C interface supports SCL rates up to 3.4MHz, enabling integration into existing automotive and industrial control networks. A power-good output indicates when the regulated output is within limits, and fault reporting supports diagnostic visibility for protection events. Protection functions include protection circuitry, under-voltage lockout (UVLO), input over-voltage protection (OVP), peak and valley current limit, and thermal shutdown.
As automotive-compliant, the AP61406Q is manufactured in facilities certified to IATF 16949, supporting PPAP documents. With standard compliance, the AP61406 is available for industrial and commercial applications.