BQ29411系列介绍资料

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BQ29411

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2-4 节串联锂离子/锂聚合物电池的二级过压保护 (4.40V)

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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.

2-, 3-, or 4-Cell Secondary Protection
Low Power Consumption I_CC < 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
- 2^nd-Level Overvoltage Protection in Li-Ion Battery Packs in:
  - Notebook Computers
  - Portable Instrumentation
  - Portable Equipment

Function	Protection
Number of series cells (min)	2, 3, 4
Number of series cells (max)	3, 4
Features	Overvoltage, Single pin output drive
Operating current (typ) (µA)	2
Rating	Catalog
Vin (max) (V)	25
Overvoltage protection	4.4
Operating temperature range (°C)	-40 to 110
Battery overvoltage protection (min) (V)	4.375
Battery overvoltage protection (max) (V)	4.425

SSOP (DCT)	8	11.8 mm² 2.95 x 4
TSSOP (PW)	8	19.2 mm² 3 x 6.4

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BQ29411

2-4 节串联锂离子/锂聚合物电池的二级过压保护 (4.40V)

FUNCTION

4000-306-326