BQ29440

AKTIV

Sekundärer Überspannungsschutz für Li-Ion/Poly mit 2-4 Zellen in Reihe (4,35 V)

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Datenblatt

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

BQ29440

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

4.35

Operating temperature range (°C)

-40 to 85

Battery overvoltage protection (min) (V)

4.325

Battery overvoltage protection (max) (V)

4.375

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

4.35

Operating temperature range (°C)

-40 to 85

Battery overvoltage protection (min) (V)

4.325

Battery overvoltage protection (max) (V)

4.375

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

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

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BQ29440

Sekundärer Überspannungsschutz für Li-Ion/Poly mit 2-4 Zellen in Reihe (4,35 V)

BQ29440

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