Diodes Incorporated AP63300WU-EVM

Overview

AP63300WU-EVM from Diodes Incorporated is an evaluation board for the AP63300 synchronous buck converter IC - a 3.8V–32V input, 3A, low-quiescent-current (22µA in PFM) DC-DC regulator with integrated 75mΩ/40mΩ MOSFETs, 500kHz fixed switching frequency, and proprietary EMI-reduction features including Frequency Spread Spectrum (±6% jitter) and optimized gate drive. It supports 5V output configuration out-of-box for rapid validation in point-of-load applications.

For engineers reviewing the AP63300WU-EVM datasheet, AP63300WU-EVM pinout, AP63300WU-EVM application, or AP63300WU-EVM equivalent, this board enables fast functional verification of AP63300's light-load efficiency (88% at 5mA), thermal performance under 3A load, EMI behavior with FSS enabled, and programmable UVLO via external resistor divider - all using accessible test points and jumper-controlled enable logic.

Technical Context

The AP63300WU-EVM implements the AP63300 IC in a TSOT26 package with peak current mode control and fully integrated loop compensation. It uses a 6.8µH shielded inductor, dual 22µF X5R ceramic output capacitors, and a 0.1µF BST capacitor to support stable 5V/3A operation at 12V input.

Board-level design includes dedicated test points for VIN, VOUT, SW, EN, and FB; jumper-selectable enable (H/L); and layout-optimized power paths minimizing parasitic inductance to preserve the IC's EMI reduction capabilities - particularly critical for compliance testing in consumer and industrial systems.

Key Specifications

Availability

AP63300WU-EVM is available at Aetrix Electronics and suitable for FPGA/DSP power sequencing, white goods control modules, network system PoL conversion, and cordless power tool battery management requiring stable component supply and rapid prototyping capability.

Supply support for AP63300WU-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-efficiency power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP63300WU-EVM belongs to Diodes' evaluation platform series for its AP63xxx buck converter family - designed specifically to accelerate design-in of low-I_Q, EMI-optimized DC-DC regulators into space-constrained, noise-sensitive applications.

FAQ

What input voltage range is supported on the AP63300WU-EVM?

The board accepts 3.8V to 32V DC input, matching the AP63300 IC's full operating range. It ships configured for 12V input and 5V output, but users may apply other valid input voltages (e.g., 24V) while ensuring output capacitor voltage rating (25V) and inductor saturation current (6.5A) remain within safe margins.

How do I change the output voltage on the AP63300WU-EVM?

Output voltage is set by the R1/R3 resistor divider on FB. The default 30kΩ/157kΩ network yields 5.0V. To adjust, replace R1 and R3 with values from Table 1 in DS42002 (e.g., 18kΩ/249kΩ for 12V), using 1% tolerance resistors to maintain ±1% accuracy and avoid feedback loop instability.

Does the AP63300WU-EVM support both AP63300 and AP63301 IC variants?

No - AP63300WU-EVM is specifically configured for the AP63300 variant, which includes Frequency Spread Spectrum (FSS) and PFM-only operation. The AP63301 uses PWM-only mode and lacks FSS; it requires separate evaluation hardware (e.g., AP63301WU-EVM) due to differing control architecture and pin compatibility limitations.

What test points are available for measuring switching node behavior?

The board provides direct access to SW (switch node), VIN, VOUT, EN, and FB via labeled solder pads. SW is routed to a dedicated 0.1" pitch header (J3) with minimized trace length and ground return path to support accurate oscilloscope measurements of ringing, rise/fall times, and FSS-induced frequency modulation without probe-induced artifacts.