MAX14920
PRODUCTIONHigh-Accuracy 12-/16-Cell Measurement AFEs
Industry's Most Accurate and Flexible Battery Management System Building Block
- Part Models
- 2
- 1ku List Price
- Starting From $8.68
Overview
- 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
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
Documentation
Data Sheet 1
Design Note 2
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX14920ECB+ | TQFP | ||
| MAX14920ECB+T | TQFP |
| 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 | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Evaluation Kits
Evaluation Kit for the MAX14921