Product
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BQ29400
  • BQ29400
  • BQ29400

BQ29400

ACTIVE

2nd-Level Overvoltage Protection for 2, 3, or 4 Cell LiIon & LiPoly Batteries (2nd Lev Protection)

Texas Instruments BQ29400 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

Overvoltage, Single pin output drive

Function

Protection

Operating current (typ) (µA)

2

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

Package

SSOP (DCT)-8-11.8 mm² 2.95 x 4

Features

  • 2-, 3-, or 4-Cell Secondary Protection
  • Low Power Consumption ICC < 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
    • 2nd Level Protection in Lion Battery Packs in
      • Notebook PCs
      • Portable Instrumentation
      • Medical and Test Equipment

  • 2-, 3-, or 4-Cell Secondary Protection
  • Low Power Consumption ICC < 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
    • 2nd Level Protection in Lion Battery Packs in
      • Notebook PCs
      • Portable Instrumentation
      • Medical and Test Equipment

Description

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.

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.

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