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Battery Management 
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MAX14921
High-Accuracy 12-/16-Cell Measurement AFEs
Industry's Most Accurate and Flexible Battery Management System Building Block
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
Parametric specs for Battery Monitors, Protectors, and Selectors
| Package/Pins | TQFP/80 |
| Budgetary Price (See Notes) | 6.99 |
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Simplified Block Diagram
Technical Docs
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Parameters
Parametric specs for Battery Monitors, Protectors, and Selectors
| Package/Pins | TQFP/80 |
| Budgetary Price (See Notes) | 6.99 |
Key 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
Applications/Uses
- e-Transportation Energy Packs
- Energy Storage Packs
- Industrial Battery Backup Systems
- Telecom Battery Backup Systems
Description
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.
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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