Analog Devices Inc./Maxim Integrated MAX17557EVKIT#

Overview

MAX17557EVKIT# from Maxim Integrated is an evaluation kit for the MAX17557 synchronous step-down controller IC, designed to demonstrate high-efficiency 4.5V–60V input, 0.8V–24V output DC-DC conversion using external nMOSFETs. It supports both PWM and DCM modes, features programmable soft-start/soft-stop, current-sense via R_SENSE or DCR, and operates across –40°C to +125°C ambient.

For engineers reviewing the MAX17557EVKIT# datasheet, MAX17557EVKIT# pinout, MAX17557EVKIT# application, or MAX17557EVKIT# equivalent, this kit enables rapid validation of the MAX17557's peak-current-mode control, wide-input industrial power supply design, prebiased startup behavior, and thermal performance under load transients and short-circuit conditions.

Technical Context

The MAX17557EVKIT# implements the MAX17557 controller in a fully assembled, tested 4-layer PCB layout optimized for thermal management and EMI control. It integrates all critical passive components-including RT resistor (default 350 kHz), bootstrap capacitor, VCCINT decoupling (10 µF), SS timing capacitor, and feedback divider-for immediate operation with user-supplied MOSFETs and output filter.

It validates key system-level behaviors: monotonic startup into prebiased outputs, current foldback limiting during short circuits, adjustable frequency synchronization (100 kHz–2.2 MHz), and seamless transition between PWM and DCM based on MODE/SYNC logic state-without requiring firmware or configuration tools.

Key Specifications

Availability

MAX17557EVKIT# is available at Aetrix Electronics and suitable for industrial power supplies, distributed DC systems, motion control drives, and programmable logic controller (PLC) power stages requiring stable component supply, fast prototyping turnaround, and production-ready reference design validation.

Supply support for MAX17557EVKIT# 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The MAX17557 product line delivers robust, wide-input synchronous buck controllers for harsh industrial environments-designed specifically for reliability under voltage transients, thermal stress, and long-term operation in PLCs, CNC machines, and factory automation systems.

FAQ

What is the primary function of the MAX17557EVKIT#?

The MAX17557EVKIT# is a fully assembled evaluation kit that demonstrates and validates the MAX17557 synchronous step-down controller IC. It enables engineers to verify critical performance parameters-including startup into prebiased outputs, current foldback protection, soft-start/soft-stop timing, and mode switching between PWM and DCM-using real-world load conditions and industrial input voltages up to 60V. The MAX17557EVKIT# does not include power MOSFETs, allowing users to evaluate different FET combinations.

Does the MAX17557EVKIT# include the MAX17557 IC?

Yes, the MAX17557EVKIT# includes one mounted MAX17557 IC in a 20-pin TQFN package with exposed pad. The board is populated with all supporting passives required for operation-including RT resistor (open for default 350 kHz), BST capacitor, VCCINT decoupling (10 µF ceramic), SS timing capacitor, and FB divider-enabling immediate bench testing without additional component selection or layout effort.

Can the MAX17557EVKIT# be synchronized to an external clock?

Yes, the MAX17557EVKIT# supports external clock synchronization via the MODE/SYNC pin. When an external clock signal (1.1× to 1.4× the RT-set frequency) is applied, the MAX17557 inside the kit locks to that frequency and operates in PWM mode. The kit's schematic and layout preserve signal integrity for SYNC edge detection, and the minimum pulse width requirement (50 ns) is met by standard function generators or microcontroller outputs.

What thermal performance can be expected from the MAX17557EVKIT#?

The MAX17557EVKIT# implements Maxim's recommended thermal design: the MAX17557's exposed pad is connected to a large internal PGND plane using ≥6 thermal vias, and the PCB uses a 4-layer stackup per JEDEC JESD51-7. At full load (10 A), junction temperature rise is limited to ≤39°C/W (θ_JA) above ambient, enabling reliable operation up to +125°C ambient-validated per the MAX17557's specified operating range and thermal shutdown threshold of 165°C.

How does the MAX17557EVKIT# support current-sense configuration?

The MAX17557EVKIT# provides dual current-sense interface options: it includes solder pads and routing for either an external current-sense resistor (connected between CSP and CSN) or inductor DCR sensing (via RC network to CSP/CSN). The board's layout maintains tight matching and low-noise paths for both methods, and the MAX17557's gain of 13.3 V/V and ±50 mV input range are preserved-allowing accurate peak-current-mode control regardless of sensing method chosen.