Part Number: BQ29412
Function: VOLTAGE PROTECTION FOR 2-, 3-, OR 4-CELL Li-Ion BATTERIES
Package: TSSOP, SM8 Type
Manufacturer: Texas Instruments
Pinouts:
Description
BQ29412 is a secondary overvoltage protection IC designed for 2- to 4-cell lithium-ion battery packs, featuring a fixed 4.45V high-accuracy detection threshold in a compact package. It integrates precise voltage monitoring, programmable delay timing, and strong ripple rejection to ensure stable operation even under pulse charging conditions. This device is commonly used in battery protection circuits for portable electronics and energy storage systems.
Features
- Fixed high-accuracy overvoltage protection threshold (4.45V per cell)
- Supports 2-, 3-, and 4-cell lithium-ion battery packs
- Programmable delay time for overvoltage detection
- High power supply ripple rejection capability
- Stable operation during pulse charging conditions
- Low current consumption for battery-powered systems
• Fixed High Accuracy Overvoltage Protection Threshold
– bq29410 = 4.35 V
– bq29411 = 4.40 V
– bq29412 = 4.45 V
– bq29413 = 4.50 V
– bq29414 = 4.55 V
– bq29415 = 4.60 V
– bq29419 = 4.30 V
• Programmable Delay Time of Detection
• High Power Supply Ripple Rejection
• Stable During Pulse Charge Operation
Block Diagram
Design Notes
- Place the IC close to the battery cells to minimize sensing errors due to trace resistance
- Select appropriate external delay capacitor to set accurate overvoltage detection timing
- Ensure proper grounding to improve noise immunity and ripple rejection
- Consider thermal conditions in tightly packed battery modules
- Use with primary protection IC for redundant safety architecture
How to Choose This Part
- Select based on required overvoltage threshold (4.45V per cell for BQ29412)
- Suitable for designs requiring secondary independent protection
- Choose when high accuracy and stability under ripple conditions are critical
- Ideal for multi-cell lithium-ion battery safety applications
Applications
- Notebook computers
- Portable instrumentation
- Battery-powered portable equipment
- Lithium-ion battery packs
Other data sheets are available within the file:
BQ29410, BQ29410DCT3R, BQ29410DCT3RE6, BQ29410DCTR, BQ29410DCTRG4
BQ29412 Datasheet PDF Download
