BQ29412中文资料2-4 节串联锂离子/锂聚合物电池的二级过压保护 (4.45V)数据手册TI规格书

描述 Description

The bq2941x is a secondary overvoltage protection IC for 2-, 3-, or 4-cell lithium-ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit. It includes a programmable delay circuit for overvoltage detection time.
FUNCTIONEach cell in a multiple-cell pack is compared to an internal reference voltage. If one cell reaches an overvoltage condition, the protection sequence begins. The bq2941x device starts charging an external capacitor through the CD pin. When the CD pin voltage reaches 1.2 V, the OUT pin changes from a low level to a high level.

特性 Features

• 2-, 3-, or 4-Cell SecondaryProtection
• Fixed High Accuracy Overvoltage Protection Threshold
• bq29411 = 4.40 V
• bq29413 = 4.50 V
• bq29415 = 4.60 V
• Programmable Delay Time of Detection
• Stable During Pulse Charge Operation
• Portable Instrumentation
• Portable Equipment