Diodes Incorporated AP62500SJ-EVM

Overview

AP62500SJ-EVM from Diodes Incorporated is an evaluation module for the AP62500 5A synchronous buck converter, designed to demonstrate fast transient response, EMI-optimized switching, and multi-mode operation (PFM/USM/PWM) across 4.5V–18V input. It supports adjustable 0.6V–7V output, programmable soft-start, and precision power-good signaling in a V-QFN2030-12 (Type A) package - validated for FPGA, DSP, and consumer audio point-of-load applications.

For engineers reviewing the AP62500SJ-EVM datasheet, AP62500SJ-EVM pinout, AP62500SJ-EVM application, or AP62500SJ-EVM equivalent, this page delivers verified functional context, thermal performance data, mode-select behavior, EMI-reduction architecture, and real-world efficiency curves at 400/800/1200kHz switching frequencies under PFM, USM, and PWM operation.

Technical Context

The AP62500SJ-EVM implements Constant On-Time (COT) control with input-voltage-compensated on-time calculation (t_ON = V_OUT / (V_IN × f_SW)), enabling pseudo-fixed frequency operation and sub-100ns minimum off-time (255ns typ). Its proprietary gate driver suppresses switching-node ringing without degrading MOSFET turn-on/turn-off times.

It validates three selectable operating modes: PFM for light-load efficiency (<195μA I_Q), Ultrasonic Mode (USM) for noise-sensitive audio systems, and forced PWM for predictable ripple and timing. The board integrates all critical passives - including 4×22μF output capacitors, 2.2μH inductor, and BST capacitor - matching the reference design in DS44664 Rev. 1-2.

Key Specifications

Availability

AP62500SJ-EVM is available at Aetrix Electronics and suitable for FPGA power delivery, consumer audio subsystems, and network infrastructure point-of-load designs requiring stable component supply, rapid prototyping validation, and production-ready thermal performance data.

Supply support for AP62500SJ-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 integrated circuits, specializing in power management, signal integrity, and protection solutions for industrial, computing, and consumer markets.

The AP62500 product line targets high-efficiency, low-EMI DC-DC conversion in space-constrained applications - emphasizing ease of design-in through COT control, integrated MOSFETs, and robust protection features.

FAQ

What input voltage range does the AP62500SJ-EVM support?

The AP62500SJ-EVM supports 4.5V to 18V DC input, aligned with the AP62500 IC's operational range. Absolute maximum VIN is 20V DC (400ms) per datasheet DS44664 Rev. 1-2. Input capacitance uses a 22μF bulk capacitor plus high-frequency ceramic bypassing to ensure stable operation under dynamic load conditions.

How is switching frequency selected on the AP62500SJ-EVM?

Switching frequency is set via the FSEL pin: connect to GND for 400kHz, leave floating for 800kHz, or tie to VCC for 1.2MHz. The EVM implements pull-up/pull-down resistors and test points to verify each configuration, matching the IC's internal oscillator tolerance (±10% typical across temperature).

Does the AP62500SJ-EVM support soft-start and output tracking?

Yes - soft-start time is programmable via an external capacitor on the SS/TR pin (1ms default when floating); tracking capability is enabled by connecting SS/TR to another regulator's soft-start node. The EVM includes a dedicated 0.1μF ceramic footprint and jumper options for both functions.

What thermal performance can be expected from the AP62500SJ-EVM?

Measured θ_JA is 40°C/W on a four-layer FR-4 PCB with 2oz copper and minimum recommended pad layout. At 5A/5V output and 12V input, junction temperature rise remains below 65°C in still air - validated using thermal imaging and confirmed against the IC's 125°C max operating junction temperature.