The DS2714 is ideal for standalone charging of 1 to 4 AA or AAA NiMH “loose” cells. NiCd cells can also be charged. Temperature, voltage and charge time are monitored to provide proper fast charging control algorithms for Nickel Metal Hydride (NiMH) batteries. Battery tests are included to detect defective or inappropriate cells such as Alkaline primary batteries. The DS2714 supports a parallel charging topology, with independent monitoring and control of each cell.
The DS2714 is a quad‑channel charger designed for standalone charging of 1 to 4 AA or AAA NiMH (or NiCd) cells. It monitors temperature, voltage and charge time to provide fast‑charge control and includes battery‑test functions to detect alkaline or defective cells. The device supports a parallel charging topology with independent monitoring and control of each cell.
The datasheet provides absolute maximum ratings, electrical characteristics, pin descriptions, timing diagrams, and detailed charge algorithms, including pre‑charge, fast charge, top‑off, and maintenance phases. It also explains temperature sensing, cell‑voltage monitoring, and termination methods such as -ΔV and flat‑voltage detection.
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
|---|---|
| Operating Temperature Range | -40 °C to +85 °C |
| Storage Temperature Range | -55 °C to +125 °C |
| Continuous Sink Current (CC1‑4, LED1‑4) | 20 mA |
| Charge Timer Range | 0.5 h to 10 h |
It can charge 1 to 4 AA or AAA NiMH (or NiCd) cells simultaneously.
Fast charging terminates by the -ΔV (negative delta‑voltage) method or by a flat‑voltage condition.
An external 10 kΩ NTC thermistor is connected to THM1 or THM2 pins with a 10 kΩ bias resistor to VDD.
The LED pins can sink up to 20 mA continuously.