Analog Devices Inc./Maxim Integrated MAX77857WEVKIT#

Overview

MAX77857WEVKIT# from Analog Devices is a fully assembled and tested evaluation kit for the MAX77857 high-efficiency buck-boost regulator in WLP package. It supports 2.5V–16V input, delivers dynamically adjustable output from 4.5V–15V (internal feedback) or 3V–15V (external feedback), and features 7A switching current limit, I²C programmability, and factory-configured 5V startup voltage.

For engineers reviewing the MAX77857WEVKIT# datasheet, MAX77857WEVKIT# pinout, MAX77857WEVKIT# application, or MAX77857WEVKIT# equivalent, this kit enables rapid validation of power architecture, I²C register control, efficiency measurement, and thermal performance under real load conditions - especially for portable, battery-powered, and multi-rail embedded systems.

Technical Context

The MAX77857WEVKIT# implements the MAX77857 WLP IC in a production-ready reference layout with optimized hot-loop routing, dual LX node probing, and precision sense points for INS/PGND1S and OUTS/PGND2S. It integrates on-board 2.2kΩ I²C pull-ups, configurable RSEL (R9) for slave address and current limit selection, and jumper-selectable EN/VIO sourcing (J1/J2).

It supports three operational modes: standalone (EN tied to VIN, VIO powered from VL), PC-hosted via MAXUSB_INTERFACE# (I²C over USB with 1.8V VIO enforcement), or external I²C bus integration. Default configuration uses internal feedback, 7A current limit, 1.8MHz switching frequency, and 7-bit I²C address 0x66.

Key Specifications

Availability

MAX77857WEVKIT# is available at Aetrix Electronics and suitable for portable electronics development, battery management system prototyping, and multi-rail power architecture validation requiring stable component supply, traceable sourcing, and long-term lifecycle support.

Supply support for MAX77857WEVKIT# 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and consumer markets.

The MAX77857WEVKIT# belongs to Analog Devices' power management evaluation platform family, designed specifically to accelerate design-in of high-current, wide-input buck-boost regulators for space-constrained, battery-powered applications.

FAQ

What is the primary function of the MAX77857WEVKIT#?

The MAX77857WEVKIT# is an evaluation kit for the MAX77857 buck-boost regulator IC. It provides a fully assembled PCB with test points, jumpers, and interface hardware (including MAXUSB_INTERFACE#) to validate the IC's performance - including dynamic I²C-controlled output voltage adjustment, efficiency measurement, fault monitoring, and thermal behavior - without requiring custom board design.

Does the MAX77857WEVKIT# include the MAX77857 IC, and what package is used?

Yes, the MAX77857WEVKIT# includes the MAX77857 IC pre-installed in its 35-bump WLP (Wafer-Level Package) form factor. The default device is the MAX77857BEWB+T, which matches the WLP footprint and electrical specifications described in the official datasheet. No soldering or IC replacement is required for basic operation.

Can the output voltage of the MAX77857WEVKIT# be changed without modifying hardware?

Yes - the MAX77857WEVKIT# supports dynamic output voltage adjustment via its I²C interface. Using the included Windows GUI software and MAXUSB_INTERFACE#, users can change the output voltage in real time (e.g., from 5V to 9V) through register writes. With internal feedback, steps are 73.5mV; with external feedback, step size depends on resistor values.

What interfaces and connections does the MAX77857WEVKIT# provide for host communication?

The MAX77857WEVKIT# provides accessible I²C signals (SCL, SDA), EN, POKB/INTB, and VIO via test points and a dedicated MAXUSB_INTERFACE# connector. It supports three host configurations: standalone (no host), PC-based via MAXUSB_INTERFACE# (USB-to-I²C bridge with enforced 1.8V VIO), or direct connection to an external I²C master - all with proper logic-level compatibility.

Is the MAX77857WEVKIT# suitable for high-temperature evaluation up to +125°C?

No - while the MAX77857 IC itself is rated for +125°C junction temperature, several components on the MAX77857WEVKIT# (notably C10 and C11 output capacitors) are not rated for that temperature. Additionally, the MAXUSB_INTERFACE# is not rated for +125°C. For high-temp validation, users must replace non-compliant capacitors and avoid using the USB interface during thermal stress testing.