Battery Monitoring Li-Ion 2.75V to 4.5V 16-Pin VQFN EP T/R

The bq76PL102 PowerLAN dual-cell battery monitor is part of a complete scalable battery management system for use with arrays of up to 12 Li-Ion rechargeable cells. The bq76PL102 connects to one or two cells in a series string, performs voltage and temperature monitoring of each individual cell, and reports these parameters over the PowerLAN communication network. Together with a bq78PL114 master-gateway battery controller, the bq76PL102 forms a complete battery monitoring and management system for higher cell-count applications. Partitioning of the battery monitor function on a per cell basis permits connection and measurement close to the cell. This results in superior accuracy and management over competing solutions. This scheme also facilitates the PowerPump cell balancing system, a technique which actively balances capacities of Li-Ion batteries without the excessive heat or limitations of bleed-balancing techniques. The bq76PL102 PowerPump cell balancing technology uses a charge-transfer methodology which does not bleed off excess energy as heat, but instead moves energy dynamically from cell to cell as needed. Balancing is performed during all battery operational modes – charge, discharge, and rest. Balancing is automatically coordinated between all cells on a PowerLAN system. PowerPump balancing technology results in longer run time and longer cell life. The PowerLAN communications architecture has been engineered to provide robust communications in tough EMI/RFI environments while avoiding the excessive power draw, high parts count, and elevated cost of other solutions. PowerLAN permits easy scalability using series connections of bq76PL102 dual-cell battery monitors. High-cell-count battery systems of up to 12 series cells are easily constructed without complicated high-voltage cell measurement restrictions.The bq76PL102 works with the bq78PL114 master-gateway battery controller.

Monitors up to Two Individual Cell Voltages and Temperatures

Part of a Complete Low-Cost Solution for Battery Packs of up to 12 Series and One or More Parallel Cells (When Used With bq78PL114).

Advanced PowerPump Balancing Technology Equalizes Cells in Li-Ion Battery Packs, Resulting in Longer Run Time and Cell Life.

PowerPump™ Cell Balancing Transfers Charge From Cell to Cell During all Operating Conditions – No Wasteful Current Bleeding or Associated Heat Buildup.

Unique PowerLAN Isolated Communications Technology Permits Simultaneous Measurement of All Individual Cell Voltages in a Series String.

Low Current Consumption:

• <250 µA Active
• <35 µA Standby
• <1 µA Undervoltage Shutdown

Connects Directly to Cells, No Resistive Dividers

Internal LDO Regulator for Support Circuitry

Ultrasmall Footprint, 3-mm × 3-mm

Millivolt Measurement Resolution Using Delta-Sigma A/D Converter

Self-Calibrating Time Base – No Crystal Required When Used With bq78PL114

APPLICATIONS

• Uninterruptible Power Supplies (UPS)
• Portable Medical and Test Equipment
• Electric Bikes and Mild-EV Battery Packs
• Multicell Series Strings = 5S