MAX14920
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MAX14920

High-Accuracy 12-/16-Cell Measurement AFEs

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Industry's Most Accurate and Flexible Battery Management System Building Block

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Info: : PRODUCTION tooltip
Part Details
Part Models 2
1ku List Price Starting From $6.54
Features
  • High Accuracy
    • ±0.5mV (max) Cell Voltage Error
    • Simultaneous Cell Voltage Sampling
    • Self-Calibration
  • Integrated Diagnostics
    • Open-Wire and Short Fault Detection
    • Undervoltage/Overvoltage Warning
    • Thermal Shutdown
  • High Flexibility
    • SPI Interface
    • 12-Cell and 16-Cell Versions
    • +6V Minimum (3 Cells) Operation
    • +0.5V to +4.5V Cell Voltage Range
    • Integrated Cell-Balancing FET Drivers
    • Integrated 5V LDO
  • Low Power
    • 1µA Shutdown Mode
    • 1µA/10µA Cell Current Draw
Additional Details
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The MAX14920/MAX14921 battery measurement analog front-end devices accurately sample cell voltages and provide level shifting for primary/secondary battery packs up to 16 cells/+65V (max). The MAX14920 monitors up to 12 cells, while the MAX14921 monitors up to 16 cells. Both devices simultaneously sample all cell voltages, allowing accurate state-of-charge and source-resistance determination. All cell voltages are level shifted to ground reference with unity gain, simplifying external ADC data conversion.

The devices have a low-noise, low-offset amplifier that buffers differential voltages of up to +5V, allowing monitoring of all common lithium-ion (Li+) cell technologies. The resulting cell voltage error is ±0.5mV.

The devices’ high accuracy make them ideal for monitoring cell chemistries with very flat discharge curves, such as lithium-metal phosphate.

Passive-cell balancing is supported by external FET drivers. Integrated diagnostics in the devices allow open-wire detection and undervoltage/overvoltage alarms. The devices are controlled by a daisy-chainable SPI interface.

The MAX14920 is available in a 64-pin (10mm x 10mm) TQFP package with an exposed pad. The MAX14921 is available in an 80-pin (12mm x 12mm) TQFP package. Both devices are specified over the -40°C to +85°C extended temperature range.

Applications

  • e-Transportation Energy Packs
  • Energy Storage Packs
  • Industrial Battery Backup Systems
  • Telecom Battery Backup Systems
Part Models 2
1ku List Price Starting From $6.54

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX14920ECB+
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MAX14920ECB+T
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Part Models

Product Lifecycle

PCN

Feb 26, 2016

- 1589A

ASSEMBLY

MAX14920ECB+

PRODUCTION

Oct 16, 2015

- 1483C_AMENDED

WAFER FAB

MAX14920ECB+

PRODUCTION

Jun 9, 2014

- 1421

ELECTRICAL DATASHEET

MAX14920ECB+

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Feb 26, 2016

- 1589A

arrow down

ASSEMBLY

MAX14920ECB+

PRODUCTION

Oct 16, 2015

- 1483C_AMENDED

arrow down

WAFER FAB

MAX14920ECB+

PRODUCTION

Jun 9, 2014

- 1421

arrow down

ELECTRICAL DATASHEET

MAX14920ECB+

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX14921EVKIT

Evaluation Kit for the MAX14921

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MAX14921EVKIT

Evaluation Kit for the MAX14921

Evaluation Kit for the MAX14921

Features and Benefits

  • 16-Cell/65V (max) Stack Operating Voltage Range
  • Built-In Isolated USB Interface to a Windows-Based PC
  • Plugh-and-Play GUI Demonstrates All the Major Features of the MAX14921
  • µC Firmware in C Available Upon Request
  • Screw Terminal Battery Connector
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Detail

The MAX14921 evaluation kit (EV kit) demonstrates a high-accuracy 16-cell battery-management reference design. The MAX14921 is a high-accuracy 16-cell measurement analog front-end (AFE) in an 80-pin TQFP surface-mount package. The EV kit features an ADC and reference, and an isolated interface to a PC through a USB port to easily measure all cell voltages. Cell stacks up to 16 cells or 65V can be monitored, whichever is lower.
The EV kit circuit demonstrates all the features of the device through a GUI application on a Windows®-based PC.

Applications

  • e-Transportation Energy Packs
  • Energy Storage Packs
  • Industrial Battery Backup Systems
  • Telecom Battery Backup Systems

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