Analog Devices Inc./Maxim Integrated MAX77681EVKIT#

Overview

MAX77681EVKIT# from Maxim Integrated is an evaluation kit for the MAX77681 3-channel single-inductor multiple-output (SIMO) buck-boost regulator. It enables hardware validation of independent 0.8V–5.25V output rails, glitchless buck-boost transitions, <3μA quiescent current operation, and flexible power sequencing - all targeting ultra-low-power wearable and hearable systems powered by single-cell Li-ion batteries.

For engineers reviewing the MAX77681EVKIT# datasheet, MAX77681EVKIT# pinout, MAX77681EVKIT# application, or MAX77681EVKIT# equivalent, this kit provides full I²C-configurable access to the MAX77681's SIMO regulation, thermal monitoring, interrupt handling, reset generation, and on-key enable functionality - with pre-populated WLP-30 device, input/output capacitors, inductor, and test points aligned to production layout guidelines.

Technical Context

The MAX77681EVKIT# implements the complete reference design for the MAX77681 IC, including its 30-bump wafer-level package (WLP), 2.75mm × 2.15mm footprint, and 0.4mm bump pitch. It supports all three SIMO outputs (SBB0/SBB1/SBB2), I²C interface (SDA/SCL), nEN/nRST/nIRQ control signals, PWR_HLD, and BST/IN_SBB/PGND power domains as defined in the MAX77681 datasheet.

This kit integrates the exact passive BOM specified for optimal efficiency: 1.5µH shielded inductor (LXA/LXB), 10µF ceramic output capacitors per rail, 4.7µF input capacitor (CSYS), and 100nF boost capacitor (CBST). It replicates the 15.2mm² total solution size and thermal performance envelope validated for -40°C to +85°C operation.

Key Specifications

Availability

MAX77681EVKIT# is available at Aetrix Electronics and suitable for wearable electronics development, hearable system prototyping, and low-power IoT power architecture validation requiring stable component supply, rapid bring-up, and production-representative layout fidelity.

Supply support for MAX77681EVKIT# 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 high-reliability, space-constrained applications.

The MAX77681EVKIT# belongs to Maxim's ultra-low-power PMIC evaluation platform family, engineered specifically to accelerate development of battery-powered wearables, hearables, and compact IoT endpoints where SIMO topology replaces inefficient LDOs without sacrificing regulation stability or PCB area.

FAQ

What is the primary function of the MAX77681EVKIT#?

The MAX77681EVKIT# is a fully assembled evaluation kit for the MAX77681 3-output SIMO buck-boost regulator. It allows engineers to validate voltage regulation, power sequencing, I²C configuration, thermal behavior, and enable/reset timing of the MAX77681 in real-world conditions - using the exact passive components, layout, and thermal profile specified for production designs.

Does the MAX77681EVKIT# include the MAX77681 IC?

Yes, the MAX77681EVKIT# includes a pre-soldered MAX77681 in its native 30-bump wafer-level package (WLP), mounted on a compact PCB with all required external components: 1.5µH inductors (LXA/LXB), 10µF output capacitors per rail, 4.7µF input capacitor, 100nF boost capacitor, and pull-up resistors for I²C and control lines - matching the reference design in the MAX77681 datasheet.

Can the MAX77681EVKIT# be used to evaluate both MAX77680 and MAX77681 devices?

No - the MAX77681EVKIT# is configured and calibrated specifically for the MAX77681 variant, which supports higher output voltage ranges (up to 5.25V on SBB1/SBB2) and different DAC LSB sizing versus the MAX77680. While physically compatible due to identical WLP-30 packaging, firmware, register maps, and pinout, voltage range validation requires the correct target device; the kit ships with MAX77681 only.

What power sequencing capabilities does the MAX77681EVKIT# demonstrate?

The MAX77681EVKIT# demonstrates the full Flexible Power Sequencer (FPS) of the MAX77681, enabling programmable power-up/down order and timing between SBB0, SBB1, and SBB2. It validates event periods of tEN = 1.28ms (power-up) and tDIS = 2.56ms (power-down), along with factory-programmable defaults and runtime I²C reconfiguration - critical for managing processor core, I/O, and RF rail startup sequences.

Is the MAX77681EVKIT# RoHS-compliant and lead-free?

Yes, the MAX77681EVKIT# uses RoHS-compliant, lead-free assembly processes and components. The MAX77681 IC itself carries the "#" suffix indicating RoHS compliance per Maxim's package coding convention (W302H2+1), and the evaluation board meets IPC-J-STD-020 moisture sensitivity level (MSL) requirements for reflow-compatible handling.