Diodes Incorporated AP7354D-33FS4-7-EVM

Overview

AP7354D-33FS4-7-EVM from Diodes Incorporated is an evaluation board for the AP7354D low-dropout regulator, designed to demonstrate 3.3V fixed-output regulation at up to 150mA with ±1% accuracy and ultra-low 0.25µA quiescent current. It features a DFN1010-4 package LDO, onboard 0.1µF X7R input/output capacitors, and jumper-controlled enable functionality for battery-powered wearable and IoT sensor applications.

For engineers reviewing the AP7354D-33FS4-7-EVM datasheet, AP7354D-33FS4-7-EVM pinout, AP7354D-33FS4-7-EVM application, or AP7354D-33FS4-7-EVM equivalent, this board enables rapid validation of startup behavior, load regulation, dropout voltage, and standby current under real-world conditions using standard bench supplies and electronic loads.

Technical Context

The AP7354D-33FS4-7-EVM implements the AP7354D LDO in its production-ready DFN1010-4 (Type B) package with integrated output discharge, enabling clean power sequencing in space-constrained systems. It operates across 2.0V–5.5V input and delivers stable 3.3V output with guaranteed 150mA capability and -40°C to +85°C ambient operation.

This board supports direct measurement of key LDO parameters including line regulation (±0.02%/V), load regulation (±0.1%/100mA), and transient response to step-load changes up to 100mA, using accessible test points for VIN, VOUT, EN, and GND.

Key Specifications

Availability

AP7354D-33FS4-7-EVM is available at Aetrix Electronics and suitable for wearable electronics development, IoT sensor module prototyping, and battery-operated wireless communication design requiring stable component supply and fast time-to-test.

Supply support for AP7354D-33FS4-7-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 power management, signal integrity, and protection solutions for high-volume consumer, industrial, and automotive markets.

The AP7354D product line targets ultra-low-power battery-operated applications where extended runtime, tight output tolerance, and small footprint are critical - particularly in wearables, edge sensors, and compact wireless modules.

FAQ

What input voltage range is supported by the AP7354D-33FS4-7-EVM?

The board supports 2.0V to 5.5V input per the AP7354D's recommended operating conditions. For optimal regulation, VIN should be set to VOUT + 1V (i.e., ≥4.3V) during testing. Absolute maximum input is 6.0V, but sustained operation above 5.5V risks device stress and invalidates specification compliance.

How is the enable function implemented on this evaluation board?

The EN pin of the AP7354D is routed to jumper J1, which selects between "High" (EN tied to VIN for active operation) and "Low" (EN grounded for shutdown). In shutdown mode, the LDO draws only 0.02µA typical standby current and activates output discharge to clear residual charge from the output capacitor.

Can I replace the onboard 0.1µF capacitors with higher values?

Yes - the board accepts 0805 MLCCs up to 10µF, but stability requires X5R or X7R dielectrics with ESR <1Ω. Larger values improve ripple suppression but may increase startup time; values below 0.1µF risk instability per the AP7354D's minimum output capacitance requirement.

Does the AP7354D-33FS4-7-EVM include thermal pads or heatsinking provisions?

No - the DFN1010-4 package has no exposed thermal pad, and the PCB uses standard FR-4 with no copper pour or thermal vias dedicated to heat dissipation. Maximum power dissipation is limited to 315mW; operation above 150mA at high VIN–VOUT differentials requires external airflow or derating per junction temperature limits.