LTC4060EDHC#PBF

LTC4060 is a complete fast charging system for NiMH or NiCd batteries. Just a few external components are needed to design a standalone linear charging system. An external PNP transistor provides charge current that is user programmable with a resistor. A small external capacitor sets the maximum charge time. No external current sense resistor is needed, and no blocking diode is required. The IC automatically senses the DC input supply and battery insertion or removal. Heavily discharged batteries are initially charged at a C/5 rate before a fast charge is applied. Fast charge is terminated using the –∆Vdetection method. Backup termination consists of a programmable timer and battery overvoltage detector. An optional external NTC thermistor can be used for temperature-based qualification of charging. It is used in applications such as portable computers, cellular phones and PDAs, medical equipment, charging docks and cradles, portable consumer electronics etc.

• Complete fast charger controller for single, 2-, 3- or 4-series cell NiMH/NiCd batteries
• No firmware or microcontroller required, VCC supply shutdown current is 250µA typical
• Automatic recharge keeps batteries charged
• Programmable fast charge current is 0.4A to 2A
• Fast charge current programmable beyond 2A with external sense resistor
• Automatic detection of battery, precharge for heavily discharged batteries
• Optional temperature qualified charging, charge and AC present status outputs can drive LED
• Automatic sleep mode with input supply removal, manual shutdown
• Input supply range is 4.5V to 10V, VCC supply current is 2.9mA typical
• Operating ambient temperature is -40°C to 85°C, package style is 16-lead plastic DFN

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