2-4 节串联锂离子/锂聚合物电池的二级过压保护 (4.45V)
| Function | Protection |
| Number of series cells (Min) | 2, 3, 4 |
| Number of series cells (Max) | 3, 4 |
| Features | Overvoltage, Single pin output drive |
| Typical operating current (Typ) (uA) | 2 |
| Rating | Catalog |
| Vin (Max) (V) | 25 |
- 2-, 3-, or 4-Cell Secondary Protection
- Low Power Consumption ICC < 2 μA [VCELL(ALL) < V(PROTECT)]
- 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
- APPLICATIONS
- 2nd-Level Overvoltage Protection in Li-Ion Battery Packs in:
- Notebook Computers
- Portable Instrumentation
- Portable Equipment
- 2nd-Level Overvoltage Protection in Li-Ion Battery Packs in:
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.
FUNCTION
Each 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.
