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AIC1784

Battery Charge Controller

FEATURES
  • Fast Charge Control of NiMH/NiCd Batteries,
  • even with a Fluctuating Charging Current.
  • Fast Charge Termination by: ΔT/Δt, ΔV, 0ΔV, Safety Timer, Maximum Temperature, Maximum Voltage.
  • Linearly Adjustable ΔT /Δt Detection Slope and Safety Timer.
  • Protection against Battery Voltage and Battery Temperature Faults.
  • Pulsed Trickle Charge Modes.
  • Quick and Easy Testing for Production.
  • SOP-8 and DIP-8 Packages.
APPLICATIONS
  • Battery Fast Chargers for:
  • lMobile Phones.
  • lNotebook and Laptop Personal Computers.
  • lPortable Power Tools and Toys.
  • lPortable Communication Equipments.
  • lPortable Video & Stereo Equipments.
DESCRIPTION
The AIC1784 fast charge controller IC is designed for intelligent charging of NiMH or NiCd batteries without the risk of overcharge. -ΔV Detection (-0.25%), 0ΔV detection (peak voltage timer) and ΔT /Δt detection are the primary methods employed by the AIC1784 to terminate fast charge. The fast charge can also be cut off by maximum battery voltage and maximum battery temperature detection along with the safety timer to prevent charging under fault conditions of the charging system or the battery itself.
Both ΔT /Δt and -ΔV detection methods have been proved powerful in terminating fast charging for NiMH and NiCd batteries. The AIC1784 utilizes the combination of these two methods to achieve reliable decision of ending fast charge and prevent misacting caused by using -ΔV detection alone under certain conditions. Fig. 1 shows an example of charging curve of a battery charged by a fluctuating current from a NiMH battery charger, which uses the AIC1784 controller IC to achieve optimal charging. This technique, in cooperating with the 0ΔV detection (peak voltage timer), is particularly suitable for NiMH batteries, whose voltage drop is hardly significant yet temperature rises rapidly.
The safety timer period is adjustable. Test mode is provided for charger manufactures to dramatically reduce production test time.
TYPICAL APPLICATION


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