Diodes Incorporated AP66300QFVBW-EVM

Overview

AP66300QFVBW-EVM from Diodes Incorporated is an automotive-grade evaluation module for the AP66300Q 3.8V–60V input, 3A synchronous buck converter. It implements current-mode control with internal 120mΩ high-side and 55mΩ low-side MOSFETs, supports adjustable 300kHz–2.5MHz switching frequency (default 500kHz), delivers up to 95% efficiency in enhanced bias mode, and features AEC-Q100 Grade 1 qualification (−40°C to +125°C TA) for use in infotainment power rails.

For engineers reviewing the AP66300QFVBW-EVM datasheet, AP66300QFVBW-EVM pinout, AP66300QFVBW-EVM application, or AP66300QFVBW-EVM equivalent, this module enables rapid validation of the AP66300Q's PFM/PWM operation, soft-start sequencing, power-good signaling, and thermal performance under real automotive load transients and input voltage ranges (12V/24V/48V).

Technical Context

The AP66300QFVBW-EVM implements a complete reference design for the AP66300Q buck controller, including optimized layout for minimal EMI, thermally enhanced U-QFN4040-16/SWP (UXB) package mounting, and full support for all device modes: forced PWM (MSYNC = HIGH), PFM (MSYNC = GND), and external clock synchronization (MSYNC = 300–2500kHz). It validates the IC's internal loop compensation across 0.8V–50V output range.

It demonstrates key functional behaviors: pre-biased start-up, external soft-start/tracking via SS/TR pin, BIAS pin switchover at 4.5V, ±5% PG detection with internal 5MΩ pull-up, hiccup-mode OCP, and thermal shutdown at 165°C. The board uses 6.5µH inductors and 2×22µF ceramic output capacitors per rail to meet ripple and transient response specs per DS43723 Rev. 1–2.

Key Specifications

Availability

AP66300QFVBW-EVM is available at Aetrix Electronics and suitable for automotive infotainment power validation, FPGA/DSP point-of-load prototyping, and distributed telecom DC/DC system development requiring stable component supply and AEC-Q100-compliant reference designs.

Supply support for AP66300QFVBW-EVM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The AP66300Q product line targets automotive-grade DC/DC conversion in harsh environments - designed specifically for infotainment head units, ADAS domain controllers, and body electronics requiring wide VIN, low I_Q, and AEC-Q100 compliance.

FAQ

What is the primary purpose of the AP66300QFVBW-EVM?

The AP66300QFVBW-EVM is a fully assembled evaluation board that demonstrates and validates the operational behavior of the AP66300Q synchronous buck converter. It enables engineers to verify startup sequencing, load transient response, efficiency curves, thermal derating, and mode switching (PFM/PWM/sync) without designing a custom PCB. It includes test points, jumpers, and layout-optimized components matching Diodes' recommended design.

Does the EVM support both PFM and PWM modes?

Yes - the EVM supports all three operating modes of the AP66300Q: forced PWM (MSYNC tied to VCC), PFM (MSYNC tied to GND), and external clock synchronization (MSYNC driven by 300–2500kHz square wave). Jumper JP1 allows quick reconfiguration between these modes, and the board includes dedicated test points for MSYNC, PG, and SW signals to monitor mode behavior in real time.

Can the AP66300QFVBW-EVM be used for AEC-Q100 compliance testing?

No - the EVM itself is not AEC-Q100 qualified. However, it hosts the AEC-Q100 Grade 1 qualified AP66300Q IC and replicates the thermal, electrical, and layout conditions specified in Diodes' qualification report. Engineers use it to gather pre-compliance data (e.g., thermal imaging, ripple, transient response) required for full AEC-Q100 system-level testing in automotive applications.

What output voltage range can be configured on this EVM?

The EVM supports output voltages from 0.8V to 50V via the FB resistive divider. Default configuration delivers 5V (R1 = 100kΩ, R2 = 16.2kΩ), but R1/R2 pads allow easy reconfiguration. The board includes solder jumpers to enable/disable BIAS pin connection to VOUT (for 5V–15V outputs) and provisions for external soft-start capacitor selection per application requirements.