MAX17851AUP/V+T

MAX17851AUP/V+T is Maxim/Analog Devices’ automotive-grade battery-management unit (BMU) for large Li‑ion packs (EVs and energy-storage systems). It combines multi-cell voltage sensing, temperature sensing, current/ Coulomb counting, and cell balancing with robust safety protections (undervoltage/overvoltage, overcurrent/short-circuit, thermal). It provides a digital interface (typically SPI) to a host microcontroller for pack management, diagnostics, and control, and includes a safety-rated core for fault detection. The device is designed for high-voltage, multi‑cell stacks and is offered in the AUP package with tape‑and‑reel (+T). Typical applications include battery packs in electric vehicles, stationary energy-storage systems, and industrial battery modules. For exact cell-count, voltage range, balancing current, and pinout, consult the datasheet.

Here are the main features of MAX17851AUP/V+T (Automotive BMS IC for multi‑cell Li‑ion packs):
- Automotive‑grade device for high‑voltage battery packs; supports multi‑cell configurations
- Cell sensing: up to 14-series cell voltage inputs with high‑precision ADCs
- Current and temperature sensing: pack current sense plus multiple temp sensor inputs
- Balancing drive: external FET gate drive for cell balancing (programmable current; active or passive based on design)
- Protection suite: UVLO/OVLO, UVP/OVP, OCP/SCP, over‑temperature with fault latch and fast fault response
- Digital interface: isolated SPI to host microcontroller with galvanic isolation
- Power for the IC: built‑in DC‑DC regulator from the HV pack
- Built‑in BMS functions: SOC estimation/coulomb counting, balancing control, fault management
- Diagnostics and nonvolatile data: calibration data and fault/history storage
- Low quiescent current and wide operating temperature range (-40°C to +125°C)
- RoHS compliant with automotive qualification (AEC/Q) for reliability in harsh environments
Note: For exact pinout, cell count, balancing modes, and Programmable parameters, refer to the latest MAX17851A datasheet.

MAX17851AUP/V+T is in a 56‑pin QFN package (9×9 mm) with an exposed pad (EP).

Pin count: 48 pins (AUP/V+T package).
Function: Automotive-grade battery-management-system (BMS) IC. It acts as the pack controller and protection unit, performing cell-voltage, current, and temperature monitoring; cell balancing control; protection functions (OV/UV/OC/shorts); and communication with a host MCU ( SPI/I2C). It also provides gate-drive outputs for external MOSFETs as part of the pack protection system.

Manufacturer: Maxim Integrated Products (now part of Analog Devices).
What kind of company: A fabless semiconductor company that designs and markets analog, mixed-signal, and high-performance integrated circuits for automotive, industrial, communications, and consumer applications.

Application areas:
- Automotive BMS for EV/HEV high-voltage packs (multi-cell Li-ion/LiFePO4)
- Energy-storage system (ESS) BMS with cell balancing
- Industrial, UPS, and telecom high-voltage battery monitoring and protection
- Solar/wind energy storage and microgrid applications
- Battery-pack testing and safety interlocks

The MAX17851AUP/V+T is Maxim’s high‑voltage EV battery management system (BMS) controller/monitor. Direct 1:1 equivalents are scarce. Closest cross‑refs:
- TI BQ76920/76930/76940 (multi‑cell BMS monitors/controllers)
- TI BQ76950/76960 (higher cell counts/features)
- Analog Devices LTC6810x/LTC6811/LTC6812/LTC6813/LTC6814 family (modular multi‑cell battery monitors with daisy‑chain)
Note: exact pinout and features differ; choose by cell count, HV range, and comms (CAN/SPI).