Analog Devices Inc./Maxim Integrated MAX11068GUU/V+

Overview

MAX11068GUU/V+ from Maxim Integrated is a programmable, AEC-Q100 Grade 2 qualified, 12-channel high-voltage battery-monitoring smart data-acquisition interface IC. It performs differential cell-voltage measurement (0.5V–4.7V full-accuracy range), integrated cell balancing (up to 200mA per switch), and temperature monitoring via two auxiliary analog inputs - all within a single 38-pin TSSOP package operating from –40°C to +105°C. It targets automotive battery packs, HEV/EV systems, and high-series stacked Li-ion or supercapacitor banks.

For engineers reviewing the MAX11068GUU/V+ datasheet, MAX11068GUU/V+ pinout, MAX11068GUU/V+ application, or MAX11068GUU/V+ equivalent, this page delivers verified technical context, real-world timing and accuracy specs, validated I²C ladder interface behavior, confirmed cell-balancing current capability, and precise thermal shutdown thresholds - all extracted from Maxim's official documentation and functional diagrams.

Technical Context

The MAX11068GUU/V+ implements a dual-phase SAR ADC architecture: first acquisition phase captures all 12 cell voltages differentially across series-stacked cells, followed by an error-cancellation phase using input chopping to suppress offset drift and noise-induced errors. Its internal 6.0MHz oscillator (±3.0% accuracy) clocks the 12-bit ADC, enabling full 12-cell conversion in under 107µs with ±0.25% total voltage-measurement accuracy over –40°C to +105°C.

It features dual isolated I²C ports (upper/lower) with built-in level-shifting circuitry: SCLU/SDAU operate referenced to VDDU/GNDU (up to 70V above AGND), while SCLL/SDAL reference VDDL/GNDL. Communication uses SMBus-ladder topology supporting up to 31 daisy-chained devices with autoaddressing, CRC-checked data transfers, and fault-tolerant hardware handshake - no external isolators required.

Key Specifications

Availability

MAX11068GUU/V+ is available at Aetrix Electronics and suitable for electric vehicle battery management, hybrid powertrain control, and high-reliability industrial energy storage systems requiring stable component supply, automotive qualification traceability, and long-term lifecycle support.

Supply support for MAX11068GUU/V+ 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 automotive, industrial, and communications applications - emphasizing high reliability, AEC-Q100 compliance, and system-level integration.

The MAX11068GUU/V+ belongs to Maxim's battery sensor product line, engineered specifically for high-voltage, multicell battery stack monitoring in automotive and transportation systems - delivering integrated voltage acquisition, cell balancing, thermal sensing, and robust daisy-chain communication in one package.

FAQ

What is the primary function of the MAX11068GUU/V+ in a battery management system?

The MAX11068GUU/V+ serves as a complete smart data-acquisition interface for high-voltage battery stacks, performing simultaneous differential voltage measurement across 12 series-connected cells, detecting overvoltage/undervoltage faults, executing active cell balancing (up to 200mA per switch), and monitoring temperature via two auxiliary analog inputs. Its integrated SMBus-ladder interface enables scalable, isolation-free communication across multi-module battery packs - a core capability confirmed in Maxim's functional block diagram and application circuits.

Does the MAX11068GUU/V+ support daisy-chained communication without external isolators?

Yes. The MAX11068GUU/V+ incorporates dual level-shifted I²C ports (SCLU/SDAU and SCLL/SDAL) with built-in voltage translation, allowing up to 31 devices to be SMBus-laddered in series without optocouplers or digital isolators. Each port operates on separate ground domains (GNDU and GNDL), tolerating up to 80V ground potential differences between adjacent modules - a feature explicitly validated in the Absolute Maximum Ratings table and Figure 4 operating circuit.

What is the guaranteed accuracy range for cell voltage measurement on the MAX11068GUU/V+?

The MAX11068GUU/V+ guarantees ±0.25% total voltage-measurement accuracy across its full operating temperature range (–40°C to +105°C), with full specification coverage from 0.5V to 4.7V per cell. This accuracy includes gain, offset, and linearity errors - confirmed in the Electrical Characteristics table under "Channel Accuracy" and "Differential Nonlinearity" columns, and reinforced by the two-phase chopping ADC architecture described in the Detailed Description section.

How does the MAX11068GUU/V+ handle thermal protection during cell balancing?

The MAX11068GUU/V+ integrates die-level thermal monitoring with automatic shutdown at +145°C (rising threshold) and 15°C hysteresis. When triggered, it disables both the cell-balancing switches and the internal linear regulator to prevent thermal runaway - a safety mechanism documented in the Electrical Characteristics table under "Thermal Shutdown" and elaborated in the Detailed Description section regarding thermal overload response.

What are the power consumption modes of the MAX11068GUU/V+ and their typical current draw?

The MAX11068GUU/V+ offers three defined power states: acquisition mode draws 3.0–6.0mA from DCIN (at 30V), standby mode consumes 55–150µA, and shutdown mode draws only 0.25–2µA - values directly specified in the "POWER-SUPPLY REQUIREMENTS DCIN" table. These low quiescent currents enable extended operation in always-on BMS architectures while maintaining fast wake-up (<3ms startup time from SHDN or POR).