LTC4121EUD

Series:	*
Part Status:	Obsolete

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Introduction

The LTC4121EUD is an extremely versatile, low-quiescent-current buck-boost battery charge controller that provides up to 4A of charging current over a wide battery voltage range of 2.5V to 14V. The device is designed to charge short-duration, low-voltage batteries or secondary cells with or without protection circuits while having a very low quiescent current of 0.75μA. The LTC4121EUD provides two programmable, safety-certified charge protocols: the LTC4121-1C and the LTC4121-1D standards. It also has an exclusive optional programmable voltage profile, meaning that it can be used to charge a wide variety of battery chemistries and provide the most efficient charging possible. This article discusses the application field and working principle of the LTC4121EUD.

Application Field of LTC4121EUD

The LTC4121EUD is primarily used as a battery charger for short-duration, low-voltage batteries or secondary cells. Due to its wide voltage range and four-stage charge profile, the device is suitable for both fast and slow charging of most battery chemistries, including lithium-ion, lithium-polymer, nickel-metal-hydride, and nickel-cadmium. The device’s four-stage charge protocol improves the longevity of the battery by ensuring equality and balance between cells in multi-cell packs. The charger also has an optional gradual voltage increase feature, which enables the device to charge lower voltage batteries with higher voltage. The device is especially suitable for charging energy storage systems where longer-term depth of discharge is desirable.

Working Principle of LTC4121EUD

The LTC4121EUD is a buck-boost battery charge controller that has a 4-stage charge cycle. The device starts in constant current mode where a fixed current is delivered to the battery for a predetermined time; this stage is followed by constant voltage mode where a fixed voltage is applied across the battery for a pre-programmed time. The device then enters a float stage where the charge current decays to zero and the battery is maintained at the float voltage for a predetermined time. Lastly, the device enters the trickle charge stage, where a low charge current is maintained until the battery reaches a full charge. The optional programmable voltage profile can be used to adjust the charge voltage for more efficient charging of different chemistries. The device also includes an adjustable safety timer, which prevents its overcharging since the device will switch off after a certain amount of time. It also has adjustable temperature regulation, which reduces the battery temperature during charging and prevents overheating. Furthermore, the device has a low battery disconnect control, which disconnects the battery from the charger when the battery voltage drops below a certain threshold.

Conclusion

The LTC4121EUD is a high-efficiency, low quiescent-current battery charger that is suitable for charging a variety of battery chemistries. Its wide voltage range and adjustable charge protocols make it suitable for both fast and slow charging. The device also includes several safety features such as adjustable safety timer and temperature regulation. This makes it ideal for use in applications such as energy storage systems, where safety and efficiency are essential.

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