Analog Devices Inc./Maxim Integrated MAX8556EVKIT

Overview

MAX8556EVKIT from Maxim Integrated is an evaluation kit designed to demonstrate and validate the MAX8556 4A ultra-low-input-voltage LDO regulator, supporting input voltages from 1.425V to 3.6V, delivering up to 4A output current with 100mV typical dropout at full load, and featuring a POK (Power-OK) output for system monitoring in point-of-load applications.

For engineers reviewing the MAX8556EVKIT datasheet, MAX8556EVKIT pinout, MAX8556EVKIT application, or MAX8556EVKIT equivalent, this kit enables rapid prototyping of low-voltage, high-current LDO circuits for servers, optical modules, and base station power rails-providing validated thermal layout, capacitor selection guidance, and real-world transient response characterization.

Technical Context

The MAX8556EVKIT implements the MAX8556 IC in its standard 16-pin TQFN (5mm × 5mm) package with exposed paddle, configured with fixed 1.2V output (via R1=100kΩ, R2=1.4kΩ, R3=1kΩ feedback network), 2×10µF ceramic input/output capacitors, and integrated thermal vias for heatsinking. It supports full 4A load testing under 1.425V–3.6V input conditions.

Board-level features include EN-controlled startup, POK open-drain status signaling with internal 50µs glitch immunity, short-circuit foldback protection (3A max), and thermal shutdown activation at +160°C junction temperature-mirroring all critical functional and protection behaviors of the MAX8556 IC itself.

Key Specifications

Availability

MAX8556EVKIT is available at Aetrix Electronics and suitable for server power validation, optical module PoL design, and base station LDO qualification requiring stable component supply, pre-validated thermal performance, and production-ready layout reference.

Supply support for MAX8556EVKIT 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, communications, and computing applications.

The MAX8556EVKIT belongs to Maxim's high-current LDO evaluation platform family, engineered specifically to accelerate deployment of ultra-low-input-voltage regulators in space-constrained, thermally challenging point-of-load systems.

FAQ

What is the primary function of the MAX8556EVKIT?

The MAX8556EVKIT is a fully assembled evaluation board that demonstrates the operation, thermal behavior, and protection features of the MAX8556 4A LDO regulator. It provides a ready-to-use platform for validating 1.2V/4A point-of-load regulation under real-world conditions-including input voltage down to 1.425V, transient load steps, and POK signal timing-without requiring custom PCB design. The MAX8556EVKIT includes all necessary passive components, thermal vias, and test points aligned to the MAX8556's electrical and thermal specifications.

Does the MAX8556EVKIT support the MAX8557 or only the MAX8556?

The MAX8556EVKIT is specifically configured for the MAX8556 LDO, which features a Power-OK (POK) output. It does not support the MAX8557, which uses a Power-On Reset (POR) output with different timing (140ms delay) and threshold behavior. The board's schematic, layout, and documentation reference only the MAX8556 device, including POK pin routing, pull-up configuration, and associated timing validation waveforms. Using a MAX8557 on this board would require redesign of the feedback network and POK/POR interface circuitry.

What output voltage does the MAX8556EVKIT deliver, and is it adjustable?

The MAX8556EVKIT delivers a fixed 1.2V output at up to 4A, set by an onboard resistor divider (R1 = 100kΩ, R2 = 1.4kΩ, R3 = 1kΩ) connected to the FB pin. While the MAX8556 IC itself supports adjustable outputs from 0.5V to VIN − 0.2V, the evaluation kit is pre-configured for 1.2V to simplify validation of high-current, low-voltage operation. Users may modify the feedback resistors to adjust output voltage, but doing so requires recalculating R2 using VFB = 0.5V and verifying stability with appropriate output capacitance (20–120µF).

How does the MAX8556EVKIT handle thermal management during 4A operation?

The MAX8556EVKIT implements Maxim's recommended thermal layout: a 16-pin TQFN package mounted on a 4-layer, 2oz copper PCB with nine 12-mil thermal vias under the exposed paddle, connected to an internal ground plane. This configuration achieves a θJA of ~37.5°C/W, enabling continuous 4A operation at ambient temperatures up to +70°C with junction temperature held below +150°C. The board includes thermal test points and follows JEDEC JESD51-7 standards-allowing engineers to directly correlate measured paddle temperature (e.g., +68°C at +25°C ambient) with MAX8556 datasheet thermal models.

Can the MAX8556EVKIT be used for production-level qualification testing?

Yes-the MAX8556EVKIT is designed for engineering validation and production qualification. It incorporates production-grade components, adheres to Maxim's layout guidelines for EMI and thermal performance, and includes test points for measuring IN, OUT, FB, EN, and POK signals under dynamic load conditions. Its documented transient response (40mV overshoot at 4A step), PSRR curves, and thermal imaging data are directly traceable to the MAX8556's datasheet specifications, making it suitable for DV/PV sign-off in server, networking, and optical module programs where LDO reliability and thermal margin are critical.