AP61406Q DIODES | Alldatasheet
Document overview
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Technical content
www.diodes.com Announcement New Product diodes.com The AP61406Q is a new 5.5V, 4A, automotive-compliant* synchronous buck converter. Its I2C interface allows for low quiescent current (IQ) 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. *Automotive-compliant - AEC qualified, manufactured in facilities certified to IATF 16949, supporting PPAP documents. The Diodes logo is a registered trademark of Diodes Incorporated in the United States and other countries. All other trademarks are the property of their respective owners. © 2025 Copyright Diodes Incorporated. All Rights Reserved. I2C 5.5V, 4A, Synchronous Buck Converter Provides a Versatile High Power Density Automotive POL Solution
Applications
Automotive 5V and 3.3V POL in: ▪ Infotainment ▪ Instrument clusters ▪ Telematics ▪ Advanced Driver Assistance Systems (ADAS) The DIODES Advantage The AP61406Q's I2C interface, low IQ, inclusion of constant on-time control allows for programmable parameters in a highly efficient, small form factor design. ▪ I2C Interface with up to 3.4MHz SCL Clock Rates to Program PFM/PWM, fSW (1MHz, 1.5MHz, 2MHz, 2.5MHz), IOUT (1A/2A/3A/4A), VOUT (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 5MΩ Pull-up Accurate fault detection while reducing BOM costs ▪ Multi-Function EN Controls PFM/PWM Modes of Operation Provides flexibility for low IQ 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 AP61406Q December 2025
www.diodes.com Announcement New Product diodes.comdiodes.com 5.5V Automotive-Compliant DC-DC Buck Converter Portfolio
Ordering Information
Typical Application Schematic AP61406Q Efficiency vs. Output Current Orderable Part Number Compliance (Only Automotive Supports PPAP) Package Identification Code Moisture Sensitivity Packing Quantity Carrier AP61406QFCBW8-7 Automotive W-QFN1520-8/SWP (Type UX) H3Q MSL-1 3,000 7” Tape & Reel Part Number VIN Range VOUT Range Output Current HS/LS RDS(ON) Adj. PFM/ PWM Switching Frequency IQ Ambient Temperature PG Package V V A mΩ MHz µA °C (Type UX) AP61402Q 2.4 to 5.5 0.5 to 5.5 4 75/ 33 Yes 2 20 -40 to +125 Yes V-DFN1515-6/SWP (Type UX) AP61302Q 2.4 to 5.5 0.6 to VIN 3 70/ 50 Yes 2.2 19 -40 to +125 Yes SOT563 AP61300Q 2.4 to 5.5 0.6 to VIN 3 70/ 50 Yes 2.2 19 -40 to +125 No SOT563 AP61204Q 2.4 to 5.5 0.6 to VIN 2 70/ 50 Yes 2.4 19 -40 to +125 Yes SOT563 VIN EN SW FB L 470nH CIN 22uF VIN=2.3V to 5.5V GND COUT 2x22uF VOUT=0.3V to 3.6V OFF ON AP61406Q PG VIN 10k SDA SCL December 2025