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:
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.
| Number of series cells | 1, 2, 3, 4 |
| Charge current (max) (A) | 2 |
| Vin (max) (V) | 6 |
| Cell chemistry | NiCd, NiMH |
| Battery charge voltage (min) (V) | 0.95 |
| Battery charge voltage (max) (V) | 8 |
| Absolute max Vin (max) (V) | 7 |
| Control topology | Switch-Mode Buck |
| Control interface | Standalone (RC-Settable) |
| Features | BAT temp thermistor monitoring (hot/cold profile) |
| Vin (min) (V) | 4 |
| Rating | Catalog |
| Operating temperature range (°C) | -20 to 70 |
| SOIC (D) | 8 | 29.4 mm² 4.9 x 6 |
| TSSOP (PW) | 8 | 19.2 mm² 3 x 6.4 |
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