BQ29449

AKTIV

Sekundärer Überspannungsschutz für Li-Ion/Poly mit 2-4 Zellen in Reihe (4,30 V)

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Datenblatt

document-pdfAcrobat Voltage Protection For Two-, Three-, or Four-Cell Li-Ion Batteries datasheet (Rev. C) (Englisch)

BQ29449

AKTIV

Datenblatt

Jetzt bestellen

Produktdetails

Function

Protection

Number of series cells (min)

2, 3, 4

Number of series cells (max)

3, 4

Features

External delay capacitor, Overvoltage, Single pin output drive

Operating current (typ) (µA)

2

Rating

Catalog

Vin (max) (V)

28

Overvoltage protection

4.3

Operating temperature range (°C)

-40 to 85

Battery overvoltage protection (min) (V)

4.275

Battery overvoltage protection (max) (V)

4.325

Function

Protection

Number of series cells (min)

2, 3, 4

Number of series cells (max)

3, 4

Features

External delay capacitor, Overvoltage, Single pin output drive

Operating current (typ) (µA)

2

Rating

Catalog

Vin (max) (V)

28

Overvoltage protection

4.3

Operating temperature range (°C)

-40 to 85

Battery overvoltage protection (min) (V)

4.275

Battery overvoltage protection (max) (V)

4.325

VSON (DRB)

8

9 mm² 3 x 3

2-Series, 3-Series, or 4-Series Cell Secondary Protection
External Capacitor-Controlled Delay Timer
Low Power Consumption I_CC < 2 µA Typical
[V_CELL(ALL) < V_PROTECT]
High-Accuracy Overvoltage Protection:
±25 mV with T_A = 0°C to 60°C
Fixed Overvoltage Protection Thresholds:
4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V
Small 8L QFN Package
APPLICATIONS
- Second-Level Protection in Li-Ion Battery Packs
  - Notebook Computers
  - Power Tools
  - Portable Equipment and Instrumentation

2-Series, 3-Series, or 4-Series Cell Secondary Protection
External Capacitor-Controlled Delay Timer
Low Power Consumption I_CC < 2 µA Typical
[V_CELL(ALL) < V_PROTECT]
High-Accuracy Overvoltage Protection:
±25 mV with T_A = 0°C to 60°C
Fixed Overvoltage Protection Thresholds:
4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V
Small 8L QFN Package
APPLICATIONS
- Second-Level Protection in Li-Ion Battery Packs
  - Notebook Computers
  - Power Tools
  - Portable Equipment and Instrumentation

The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell Li-Ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit.

FUNCTION

The voltage of each cell in a battery pack is compared to an internal reference voltage. If any cells reach an overvoltage condition, the bq2944x device starts a timer that provides a delay proportional to the capacitance on the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low state to a high state. An optional latch configuration is available that holds the OUT pin in a high state indefinitely after an overvoltage condition has satisfied the specified delay timer period. The latch is released when the CD pin is shorted to GND.

The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell Li-Ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit.

FUNCTION

The voltage of each cell in a battery pack is compared to an internal reference voltage. If any cells reach an overvoltage condition, the bq2944x device starts a timer that provides a delay proportional to the capacitance on the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low state to a high state. An optional latch configuration is available that holds the OUT pin in a high state indefinitely after an overvoltage condition has satisfied the specified delay timer period. The latch is released when the CD pin is shorted to GND.

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Technische Dokumentation

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	Typ	Titel		Datum
*	Data sheet	Voltage Protection For Two-, Three-, or Four-Cell Li-Ion Batteries datasheet (Rev. C)		30 Nov 2010
	Application note	QFN Layout Guidelines		28 Jul 2006

Design und Entwicklung

Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.

Gehäuse	Pins	CAD-Symbole, Footprints und 3D-Modelle
VSON (DRB)	8	Ultra Librarian

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BQ29449

Sekundärer Überspannungsschutz für Li-Ion/Poly mit 2-4 Zellen in Reihe (4,30 V)

BQ29449

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