● 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 Peak Voltage (PVD), 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
● APPLICATIONS
● Nickel Charger
● High-Power, Multi-Cell Charger
●## GENERAL DESCRIPTION
●The bq24400 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 bq24400 provides these charge termination criteria:
● Peak voltage, PVD
● Maximum temperature
● Maximum charge time
●For safety, the bq24400 inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, thebq24400 uses trickle-harge to condition the battery. For NiMH batteries, the bq24400 provides an optional top-off charge to maximize the battery capacity.
●The integrated high-speed comparator allows the bq24400 to be the basis for a complete, high-efficiency battery charger circuit for nickel-based chemistries.
