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Texas Instruments BQ77205 Over-Voltage Protector

Texas Instruments BQ77205 Over-Voltage Protector offers Over-Voltage Protection (OVP) and Open-Wire (OW) protection for Li-ion battery pack systems. This over-voltage protector IC features an internal delay timer that detects overvoltage and open-wire conditions. The overvoltage and open wire trigger the OUT pin when the fault is detected. The BQ77205 over-voltage protector also features a Customer Test Mode (CTM) with significantly reduced delay time for quicker production-line testing. Typical applications include handheld garden and power tools, cordless vacuum cleaners, UPS battery backup, and light Electric Vehicles (EVs).

Features

3-series cell to 5-series cell protection
High-accuracy overvoltage protection:
- ±10mV at 25°C
- ±20mV from 0°C to 60°C
3.55V to 5.1V overvoltage protection options
Open-wire connection detection
Random cell connection
Functional safety-capable
Fixed internal delay timers
Fixed detection thresholds

Fixed output drive type:
- Active high or active low
- Active high drive to 6V
- Open drain with the ability to be pulled up externally to V_DD
Low power consumption I_CC ≈ 1µA (V_CELL(ALL) <V_OV)
Low leakage current per cell input <100nA with open wire detection disabled
8-pin DGK with 0.65mm lead pitch package footprint option

Applications

Protection for Li-ion battery packs used in:
- Handheld garden tools
- Handheld power tools
- Cordless vacuum cleaners
- UPS battery backup
- Light electric vehicles

Texas Instruments BQ77205 Over-Voltage Protector

Features

Applications

Functional Block Diagram

Schematic Diagram

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