LM3658SD-B/NOPB Integrated Circuits (ICs)

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Power Management Integrated Circuits (PMICs) are a vital part of many electrical systems, with Battery Chargers forming an important subcategory. Integrated circuits providing this kind of functionality encompass a wide range of features including voltage regulation, power conversion, battery protection, and more. The LM3658SD-B/NOPB by Texas Instruments is a multi-channel battery charger controller which helps achieve efficient and reliable battery charging. This particular device aids in charging 3 distinct battery cells of different types, allowing for the effective management of various battery properties. By understanding the application field and working principle of the LM3658SD-B/NPOB, one can understand the versatility and importantly, the charge safety this device delivers.

The LM3658SD-B/NOPB is designed to manage the charging of a variety of lithum-ion, lead acid, and nickel-cadmium batteries. It is suited for use in a variety of applications such as tools, entertainment systems, wireless services, toys, and portable medical devices. The device is configured to charge up to three separate cells of various types, and comes with a variety of programmable features to adjust a wide range of battery parameters. These include charge current, charge termination voltage, safety timers, cut off levels, and more. All these parameters are adjustable, allowing engineers to make quick and precise modifications to the charge parameters.

The core of the LM3658SD-B/NOPB is the multichannel charger controller block, which helps regulate the flow of the charge current from the power supply to the battery cells. The device is designed to separate and regulate the charging process for up to 3 different battery cells. This is achieved by connecting the cells to the power supply, with each cell including a dedicated charge current sense circuit. The sense circuit monitors the voltage of each battery, and the charger implements safety features such as charging cutoffs, timers and voltage limits if charge parameters are exceeded, protecting the cells from overcharging.

In addition to the charge control function, the LM3658SD-B/NOPB also includes various programmable states of charge. These can include precharge, full charge and end-of-charge states, the latter being employed when the battery has attained its peak voltage or the total current has dropped below the set threshold. Each battery cell also has availability of a graceful charge termination, which limits the overshoot of the peak voltage in order to effectively protect the cells. Furthermore, the device includes an integrated thermal protection feature which shuts down the charger circuitrist in order to prevent thermal runaway while keeping the batteries safe.

The power supply is connected to the charge controller, which in turn connects to the battery cells. The LM3658SD-B/NOPB features multiple power saving operating modes including sleep mode and power saving push-button mode, which helps ensure the overall power draw is minimized during standby. These features assist in delivering a robust, time-efficient and power-efficient charging solution, providing greater control over the battery cells being charged.

In conclusion, the LM3658SD-B/NOPB is an instrumental device in managing the charging process of any system that uses a variety of battery types. This integrated circuit makes use of sense circuits to monitor the various cells, safety timers and cutoffs to terminate charge flow and the application of various states of charge. Additionally, the device has a thermal protection feature which shuts down the circuit in order to prevent any damage to the battery cells. All these components work together to create a safe and reliable charging system, capable of charging any number of batteries in accordance with their individual properties.

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