Diodes Incorporated AP7370-33Y-13-EVM

Overview

AP7370-33Y-13-EVM from Diodes Incorporated is an evaluation board for the AP7370-33Y-13 3.3V fixed-output LDO regulator in SOT89-3 package, supporting input voltage up to 18V, 500mA output current, and 500mV dropout at 100mA - designed for rapid validation of power supply performance in portable instrumentation and battery-powered systems.

For engineers reviewing the AP7370-33Y-13-EVM datasheet, AP7370-33Y-13-EVM pinout, AP7370-33Y-13-EVM application, or AP7370-33Y-13-EVM equivalent, this board enables fast functional verification of load regulation, line transient response, thermal behavior, and low-ESR ceramic capacitor compatibility under real-world USB-supplied and battery-derived input conditions.

Technical Context

The AP7370-33Y-13-EVM implements a single-channel LDO evaluation platform with VIN, VOUT, and GND terminals accessible via 2.2mm × 1.35mm test pins, matching the pinout and thermal layout of the AP7370-33Y-13 IC in SOT89-3 package. It uses two 1µF/100V/X7R MLCCs (WALSIN 1206B105K101) for input and output filtering.

This board operates within the AP7370's recommended input range (3.2V–18V) and junction temperature limits (−40°C to +125°C), delivering stable 3.3V ±2% output with ≤500mV dropout at full 100mA load - enabling direct measurement of quiescent current, reverse current protection, and thermal shutdown activation.

Key Specifications

Availability

AP7370-33Y-13-EVM is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered metering, handheld weighing scales, and USB-powered embedded subsystems requiring stable component supply and rapid LDO validation capability.

Supply support for AP7370-33Y-13-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 industrial, computing, and consumer markets.

The AP7370 product line delivers ultra-low-quiescent-current LDO regulators optimized for battery longevity and thermal efficiency in space-constrained portable devices - with fixed-output variants targeting USB-peripheral and sensor-node power rails.

FAQ

What input voltage should be used to evaluate the AP7370-33Y-13-EVM?

Apply 5.3V to VIN per the Quick Start Guide - this ensures operation above the 3.3V output while staying well within the 18V absolute maximum and providing sufficient headroom for 500mV dropout margin. Input voltages between 3.2V and 18V are supported, but 5.3V enables optimal transient and regulation testing.

Does the AP7370-33Y-13-EVM include enable or shutdown control?

No - the AP7370-33Y-13-EVM implements only the core LDO functionality (VIN, VOUT, GND) and does not expose the chip enable (EN) pin. The AP7370-33Y-13 IC itself includes an enable function, but this evaluation board omits external EN circuitry to simplify validation of basic regulation performance.

Can the AP7370-33Y-13-EVM be used to measure quiescent current?

Yes - the board's minimal component count and direct VIN/GND access allow accurate quiescent current measurement using a series microammeter on the input path. At no load and 5.3V input, typical IQ is <2.5µA, consistent with the AP7370's ultra-low quiescent current specification.

Are the input and output capacitors on the AP7370-33Y-13-EVM replaceable?

Yes - C1 and C2 are standard 1206-size MLCCs (WALSIN 1206B105K101), soldered with standard rework pads. Engineers may substitute alternate 1µF/100V/X7R or higher-capacitance low-ESR ceramics to assess stability margins, load-step response, or ripple rejection under different capacitor ESR/ESL conditions.