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BQ29449
  • BQ29449

BQ29449

ACTIVE

Secondary Over-Voltage Protection for 2-4 cell in series Li-Ion/Poly (4.30V)

Texas Instruments BQ29449 Product Info

1 April 2026 0

Parameters

Rating

Catalog

Number of series cells (max)

3, 4

Number of series cells (min)

2, 3, 4

Features

External delay capacitor, Overvoltage, Single pin output drive

Function

Protection

Operating current (typ) (µA)

2

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

Package

VSON (DRB)-8-9 mm² 3 x 3

Features

  • 2-Series, 3-Series, or 4-Series Cell Secondary Protection
  • External Capacitor-Controlled Delay Timer
  • Low Power Consumption ICC < 2 µA Typical
    [VCELL(ALL) < VPROTECT]
  • High-Accuracy Overvoltage Protection:
    ±25 mV with TA = 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 ICC < 2 µA Typical
    [VCELL(ALL) < VPROTECT]
  • High-Accuracy Overvoltage Protection:
    ±25 mV with TA = 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

Description

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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