Diodes Incorporated unveils the AP61406Q, a new 5.5V, 4A, automotive-compliant synchronous buck converter. Its I²C interface allows for low quiescent current (I_Q) and the programming of various parameters, enabling the device to meet the growing demands for compact designs and high efficiency in automotive point-of-load (POL) applications. The device features an I²C-compatible, two-wire serial interface consisting of a bidirectional serial-data line (SDA) and a serial-clock line (SCL) with supported rates up to 3.4MHz.

The AP61406Q operates with an input voltage range of 2.3V to 5.5V. It integrates a 75mΩ high-side and a 33mΩ low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. Its adoption of constant on-time (COT) control minimizes external component count, facilitates loop stabilization, and results in a low output voltage ripple. For high power density, the AP61406Q is available in the tiny W-QFN1520-8/SWP (Type UX) package. A standard-compliance version, AP61406, is available and suitable for industrial and commercial applications.

Key features of the AP61406Q

• I²C Interface with up to 3.4MHz SCL Clock Rates to Program PFM/PWM, f_SW (1MHz, 1.5MHz, 2MHz, 2.5MHz), I_OUT (1A/2A/3A/4A), V_OUT (20mV steps), and Fault Status Reporting: Provides increased versatility and ease of design
• Operates at 4A Maximum Output Current in the Tiny W-QFN1520-8/SWP (Type UX): Provides high power density for high ambient temperature operation in automotive POL applications
• Accurate PG with ±5% window comparator and Internal 5 MΩ Pull-up: Accurate fault detection while reducing BOM costs
• Multi-Function EN Controls PFM/PWM Modes of Operation: Provides flexibility for low I_Q high-light-load efficiency or equal ripple across load conditions in fixed PWM
• High-Side and Low-Side Current Sense Protection During Output Short: Increases robustness in automotive POL applications

Key applications of the AP61406Q

Automotive 5V and 3.3V POL in:

• Infotainment
• Instrument clusters
• Telematics
• Advanced Driver Assistance Systems (ADAS)

Click here to learn more about the AP61406Q.