AIC1781A Datasheet | Analog Intergrations Corporation

AIC1781A Battery Charge Controller n Features n DESCRIPTION l Fast Charge Control of Ni MH/Ni Cd Batteries, even with a Fluctuating Charging Current. l Fast Charge Termination by: ∆T / ∆t , - ∆V , 0∆V , Safety Timer, Maximum Temperature, Maximum Voltage. l Linearly Adjustable ∆T / ∆t Detection Slope and Safety Timer. l Adjustable Peak Voltage Timer for 0∆V . l Battery Voltage Protection Range Selectable. l Selectable Battery Temperature Protection Mode. l Protection against Battery Voltage and Battery Temperature Faults. l Selectable LED Display Mode for Battery Status. l Five Pulsed Trickle Charge Modes. l Discharge-before-Charge Function Available for Eliminating Memory Effect. l Quick and Easy Testing for Production. l 16-pin DIP or SO Packages. n APPLICATIONS Battery Fast Chargers for: l Mobile Phones. l Notebook and Laptop Personal puters. l Portable Power Tools and Toys. l Portable munication Equipments. l Portable Video & Stereo Equipments. 1.55 Charge Current = 600 m A Cell Capacity = 550 m A Ni MH Battery 100 80 Cell Voltage 1.35 Cell Voltage (V) Temperature (°C) 1.25 Temperature 1.15 0 10 20 30 40 50 Charge Time (min.) 20 60 Fig. 1 Battery Charging Characteristics Resulting from an AIC1781A-Controlled Charger with a Fluctuating Charging Current The AIC1781A fast charge controller IC is designed for intelligent charging of Ni MH or Ni Cd batteries without the risk of overcharge. - ∆V Detection (-0.25%), 0∆V detection (peak voltage timer) and ∆T / ∆t detection are the primary methods employed by the AIC1781A 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 ∆T / ∆t and - ∆V detection methods have been proved powerful in terminating fast charging for Ni MH and Ni Cd batteries. The AIC1781A utilizes the bination of these...