Analog Devices Inc./Maxim Integrated MAX77680AEWV+T

Overview

The MAX77680AEWV+T from Maxim Integrated is a 3-channel single-inductor multiple-output (SIMO) buck-boost regulator delivering independent, glitchless voltage regulation across SBB0 (0.8–2.375V), SBB1 (0.8–1.5875V), and SBB2 (0.8–3.95V) rails with only 3.0μA quiescent current and 300nA shutdown current. It integrates a flexible power sequencer (FPS), I²C interface, and hardware enable (nEN) for ultra-low-power wearable systems such as Bluetooth earbuds and fitness monitors.

For engineers reviewing the MAX77680AEWV+T datasheet, MAX77680AEWV+T pinout, MAX77680AEWV+T application, or MAX77680AEWV+T equivalent, key selection criteria include its SIMO architecture's efficiency advantage over LDOs in battery-constrained designs, factory-programmable power-up/down sequencing, and wafer-level package compatibility with space-limited PCB layouts.

Technical Context

The MAX77680AEWV+T implements a time-multiplexed SIMO control scheme using two internal power switches (LXA, LXB) and a shared inductor to regulate three outputs without cross-regulation. Each output features independent 6-bit DAC programming, soft-start (3.3–6.6 mV/μs slew rate), and active discharge (80–260Ω impedance) for rapid rail collapse.

Its on-chip FPS supports configurable power-up/down timing (1.28ms/2.56ms event periods), while the I²C interface operates up to 3.4MHz (high-speed mode) with programmable slave address and robust noise immunity (10ns spike suppression). The device includes SYS POR (1.6–2.1V threshold), UVLO/OVLO protection, and dual thermal alarms (80°C/100°C).

Key Specifications

Pinout & Package

The MAX77680AEWV+T uses a 30-bump wafer-level package (WLP) with 0.4mm pitch in a 6×5 array (package code W302H2+1), measuring 2.75mm × 2.15mm × 0.7mm max height. Total solution footprint is 15.2mm².

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SIMO buck-boost regulator applications.

Compared with MAX77681AEWV+T, the MAX77680AEWV+T trades higher output voltage capability for tighter regulation in low-voltage domains (e.g., 0.8–1.5875V), while versus TPS65218D0RSLR it prioritizes ultra-low IQ and minimal footprint over integrated charging - making it ideal for compact, long-life wearables where charging is handled externally.

Availability

The MAX77680AEWV+T is available at Aetrix Electronics and suitable for Bluetooth earbuds, fitness monitors, and action cameras requiring stable component supply, consistent wafer-level packaging, and guaranteed long-term production availability.

Supply support for MAX77680AEWV+T 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, automotive, and consumer applications.

The MAX77680AEWV+T belongs to Maxim's ultra-low-power SIMO regulator product line, engineered specifically for space-constrained, battery-operated wearables and hearables where minimizing quiescent current and solution size is critical.

FAQ

What is the maximum load current supported by each output of the MAX77680AEWV+T?

The MAX77680AEWV+T supports >300mA per output under typical conditions (e.g., 1.8VOUT, 3.7VIN). Peak current limit is programmable across four settings (0.414A to 1.108A) via register bits IP_SBBx. Actual deliverable current depends on input voltage, output voltage, inductor selection, and thermal conditions - refer to Table 3 "SIMO Available Output Current for Common Applications" in the datasheet for derated values at specific VOUT/VIN combinations.

Does the MAX77680AEWV+T require external components for basic operation?

Yes, the MAX77680AEWV+T requires external components: one shared inductor (e.g., 1.5μH), three output capacitors (CSBB0/CSBB1/CSBB2 ≥10μF each), one boost capacitor (CBST), and input capacitor (CSYS). The evaluation kit (MAX77680EVKIT#) demonstrates a complete 15.2mm² layout using these components. No external compensation network is needed - all control loops are internally compensated.

How does the flexible power sequencer (FPS) in the MAX77680AEWV+T function?

The FPS in the MAX77680AEWV+T controls the timing and order of power-up/down for SBB0, SBB1, and SBB2. Default sequencing is factory-programmed into OTP, but I²C registers allow runtime reconfiguration. Power-up events occur in 1.28ms intervals, power-down in 2.56ms intervals. The FPS responds to nEN assertion, PWR_HLD status, and I²C commands - enabling deterministic boot sequences without MCU intervention.

Can the MAX77680AEWV+T operate without I²C communication?

Yes, the MAX77680AEWV+T can operate autonomously using factory-programmed defaults for output voltages, FPS sequence, and protection thresholds. I²C is optional for dynamic reconfiguration (e.g., voltage scaling during different operational modes) or reading status registers (fault flags, temperature). All critical functions - regulation, sequencing, POR, UVLO/OVLO - remain fully functional without I²C connection.

What thermal protection features does the MAX77680AEWV+T provide?

The MAX77680AEWV+T includes three thermal protections: overtemperature lockout at 165°C (forces shutdown), and two programmable thermal alarms at 80°C (TJAL1) and 100°C (TJAL2). Alarms assert via nIRQ and can trigger firmware responses (e.g., reduce CPU frequency), while lockout is hardware-enforced. Hysteresis is 15°C to prevent chatter near trip points. These features are active regardless of I²C configuration.