AIC1781A

AIC1781A Battery Charge Controller n FEATURES n DESCRIPTION l Fast Charge Control of NiMH/NiCd 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 Computers. l Portable Power Tools and Toys. l Portable Communication Equipments. l Portable Video & Stereo Equipments. 1.55 Charge Current = 600 mA Cell Capacity = 550 mA NiMH Battery 1.45 100 80 Cell Voltage 1.35 60 Cell Voltage (V) Temperature (°C) 1.25 Temperature 1.15 0 10 20 30 40 50 Charge Time (min.) 40 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 NiMH or NiCd batteries without the risk of overcharge. −∆V Detection (-0.25%), 0∆V detection (peak voltage timer) ...