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Switch-mode NiCd/NiMH Battery Charger with dT/dt Termination


Package | PIN: D | 8
Temp: S (-20 to 70)
Carrier: Partial Tube
Qty Price
1-9 $3.95
10-24 $3.55
25-99 $3.31
100-249 $2.90
250-499 $2.72
500-749 $2.31
750-999 $1.95
1000+ $1.86


  • Safe Management of Fast Charge for NiCd and NiMH Battery Packs
  • High-Frequency Switching Controller for Efficient and Simple Charger Design
  • Pre-Charge Qualification for Detecting Shorted, Damaged, or Overheated Cells
  • Fast-Charge Termination by ΔT/Δt, Maximum Temperature, and Maximum Charge Time
  • Selectable Top-Off Mode for Achieving Maximum Capacity in NiMH Batteries
  • Programmable Trickle-Charge Mode for Reviving Deeply Discharged Batteries and for Postcharge Maintenance
  • Built-in Battery Removal and Insertion Detection
  • Sleep Mode for Low Power Consumption
    • Nickel Charger
    • High-Power, Multi-Cell Charger

Texas Instruments  BQ24401D

The bq24401 is a programmable, monolithic IC for fast-charge management of nickel cadmium (NiCd) and nickel metal-hydride (NiMH) in single or multi-cell applications.

The bq24401 provides these charge termination criteria:

  • Rate of temperature rise (ΔT/Δt)
  • Maximum temperature
  • Maximum charge time

For safety, the bq24401 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, the bq24401 uses trickle-charge to condition the battery. For NiMH batteries, the bq24401 provides an optional top-off charge to maximize the battery capacity.

The integrated high-speed comparator allows the bq24401 to be the basis for a complete, high-efficiency battery charger circuit for nickel-based chemistries.