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.

• 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

• Number of series cells
• 1, 2, 3, 4
• Charge current (Max) (A)
• 2
• Operating Vin (Max) (V)
• 6
• Cell chemistry
• NiCd, NiMH
• Battery charge voltage (Min) (V)
• 0.95
• Battery charge voltage (Max) (V)
• 8
• Absolute Vin (safety rating) (Max) ((V))
• 7
• Control interface
• Standalone (RC-Settable)
• Features
• BAT temp thermistor monitoring (hot/cold profile)
• Operating Vin (Min) (V)
• 4
• Rating
• Catalog

BQ24400的完整型号有：BQ24400D、BQ24400DR、BQ24400PW、BQ24400PWR，以下是这些产品的关键参数及官网采购报价：

BQ24400D，工作温度：-20 to 70，封装：SOIC (D)-8，包装数量MPQ：75个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网BQ24400D的批量USD价格：4.066（1000+）

BQ24400DR，工作温度：-20 to 70，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网BQ24400DR的批量USD价格：3.464（1000+）

BQ24400PW，工作温度：-20 to 70，封装：TSSOP (PW)-8，包装数量MPQ：150个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ24400PW的批量USD价格：4.261（1000+）

BQ24400PWR，工作温度：-20 to 70，封装：TSSOP (PW)-8，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网BQ24400PWR的批量USD价格：3.629（1000+）