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Optimize battery service life while reducing system cost

with TI's bq77910 integrated battery-protection and cell-balancing solution.

The bq77910 precision protector is an integrated battery-protection and cell-balancing solution for Li-Ion battery packs. A single device can be configured to manage 4 to 10 cell battery packs. Two devices can be stacked to provide a solution for packs up to 20 cells in series.

This protection IC monitors individual cell voltages and can directly drive N-channel power MOSFETs to interrupt current flow during fault conditions. Fault detection and recovery criteria are fully programmable in non-volatile memory to suit all types of Li-Ion systems.

Automatic cell balancing is provided using internal FETs. A robust balancing algorithm ensures optimum performance over the entire operating life of the pack.

Features

4 ~ 10 series cell protection capability
Individual cell monitoring and balancing with internal FETs
NMOS power FET direct drive capability with flexible FET configuration
Compatible with 1 or 5 milliohm sense resistor
Low Quiescent Current (50 µA ON, 2.5 µA shutdown mode)
Programmable fault detection thresholds and time delays

Benefits

Adaptable to a wide range of applications including power tools, E-Bikes, and UPS equipment
Maximizes battery pack service life and performance; minimizes external components required
Reduces total system cost and allows scaling of FETs as required for variable charging and discharge rates (application-specific)
Allows system designer to optimize for minimal loss or maximum sense accuracy as required by each application
Minimizes battery discharge during storage or idle periods
Adaptable to all variations of Li-Ion systems (LiCoO2, LiFePO4, and others)

Key Parameters	bq77910
Pack Size (# of Cells)	4 - 10 with one device; upto 20 using two stacked devices
Overvoltage Threshold	Programmable from 2.8 ~ 4.35V in NVM
Protection FETs	External NMOS; series or parallel configuration options
Pin/Package	38TSSOP
	bq77910 Datasheet bq77910 Product Details bq77910 Sample bq77910 Development Module

Series Protection FET Configuration	Split Protection FET Configuration	Functional Diagram
Enlarge	Enlarge	Enlarge

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