LT4060 with temperature-controlled 2A NiMH battery charger

Description: The charging circuit is designed for rechargeable batteries, particularly for situations where high charging currents can lead to increased temperatures. The LTC4060 includes an external thermistor that detects the charging temperature to prevent overheating. This device operates as a temperature-controlled 2A NiMH battery charger. The RT component is a negative temperature coefficient thermistor, which is selected to have a resistance of 10k ohms at 45 degrees Celsius, and it should be positioned close to the battery cell surface. If the temperature exceeds 55 degrees Celsius, the LTC4060 will automatically reduce the charging current, and charging will stop altogether when the temperature rises further. The circuit includes LED indicators, LED1 and LED2, which indicate when the battery is fully charged. The maximum charging current can be set using a specific formula, and the maximum charge voltage is also adjustable. The LTC4060 can handle charging currents from 0.4A to 2A and operates within a supply voltage range of 4.5V to 10V. It is compatible with both nickel-metal hydride and nickel-cadmium rechargeable batteries.

The LTC4060 charging circuit is a sophisticated system designed to efficiently charge rechargeable batteries while ensuring safety through thermal management. The circuit integrates a thermistor that plays a crucial role in monitoring the temperature of the battery during the charging process. This thermistor, characterized by its negative temperature coefficient, decreases its resistance with increasing temperature, providing real-time feedback to the LTC4060's internal control mechanisms.

When the circuit is powered, the LTC4060 begins the charging process, delivering up to 2A of current to the battery. The thermistor's placement is critical; it should be affixed to the battery cell to accurately measure the temperature. As the battery charges, the internal circuitry continuously assesses the thermistor's resistance to determine the battery's temperature. If the temperature approaches the designated threshold of 55 degrees Celsius, the LTC4060 will initiate a reduction in charging current to mitigate the risk of overheating.

In addition to temperature control, the LTC4060 features LED indicators that provide visual feedback regarding the charging status. LED1 and LED2 serve as "full charge" indicators, illuminating when the battery is fully charged, which enhances user experience by providing clear status updates.

The circuit also allows for customization of the maximum charging current and voltage. By using the formula provided in the specifications, designers can set the maximum charging current based on their application requirements. The adjustable maximum charge voltage ensures compatibility with various battery types, making the LTC4060 a versatile choice for charging both nickel-metal hydride and nickel-cadmium batteries.

Overall, the LTC4060 charging circuit exemplifies a well-designed approach to battery management, combining efficient charging capabilities with essential safety features to protect against overheating and ensure reliable operation.Charging circuit will rise, especially rechargeable batteries and the charging circuit when a large current charging a higher temperature. LTC4060 external thermistor can detect the charging temperature to avoid overheating the charging. LT4060 with temperature-controlled 2A NiMH battery charging device as shown in RT, startling the LT4060 internal circuit temperature detection circuit, RT negative temperature coefficient of thermal sensitive resistor, the resistance at 45 can choose when lOkn thermistor close to the surface of the cell on. When the temperature is relatively high, LT4060 will automatically reduce the charge current when the temperature rises to 55 , the charging stops automatically.

Charging indicator LED1, LED2 is "full charge" indicator. feet to set the maximum charging current ,, s. = 1395 / R, feet set the maximum charge voltage. LT4060 charging current is o_4-2A, supply voltage range 4.5N10V. It can nickel-metal hydride and nickel cadmium rechargeable electric battery.