BQ29400系列介绍资料

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BQ29400

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针对 2 节、3 节或 4 节锂离子和锂聚合物电池的 2 级过压保护（第 2 级保护）

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The bq29400, bq29400A, bq29401, and bq29405 are BiCMOS secondary protection ICs for 2-, 3-, or 4-cell Lithium-Ion battery packs that incorporate a high-accuracy precision over voltage detection circuit. They include a programmable delay circuit for over voltage detection time.

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 bq2940x 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)]
High Accuracy Over Sense Voltage:
- bq29400: 4.35 V ±25 mV
- bq29400A: 4.40 V ±25 mV
- bq29401: 4.45 V ±25 mV
- bq29405: 4.65 V ±25 mV
Prefixed Protection Threshold Voltage
Programmable Delay Time
High Power Supply Ripple Rejection
Stable During Pulse Charge Operation
APPLICATIONS
- 2^nd Level Protection in Lion Battery Packs in
  - Notebook PCs
  - Portable Instrumentation
  - Medical and Test 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)	25.3
Overvoltage protection	4.35
Operating temperature range (°C)	-25 to 85
Battery overvoltage protection (min) (V)	4.325
Battery overvoltage protection (max) (V)	4.375

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

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BQ29400

针对 2 节、3 节或 4 节锂离子和锂聚合物电池的 2 级过压保护（第 2 级保护）

4000-306-326