MIC79050-4.2BM

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The MIC79050-4.2BM is a Battery Charger Pulse Modulation and Control device from Micrel Semiconductor, for charging Single Cell Lithium-Ion/Polymer batteries. A DC power input is used to charge a single-cell Li-Ion battery, capable of delivering up to 4.2A output current. The device is designed to pick up the correct charging voltage with up to 14V DC input. The MIC79050-4.2BM also features charge current counter measurement, temperature monitoring, and various protection features to ensure safe and reliable operation.

Application field

The MIC79050-4.2BM is an ideal solution for Main/Secondary Li-Ion battery charging in portable electronic devices such as laptop computers, Camera, audio players etc.

The MIC79050-4.2BM is designed to use a PWM-variable power (CW) method to precisely regulate the battery charging process. The MIC79050-4.2BM can detect the battery\'s voltage and establish a target voltage and current. It then adjust the output current linearly to achieve the target voltage. This is done by monitoring the battery voltage, and then adjusting the output current to maintain the output voltage at the programmed level. The linear current proportionality makes the system efficient, resulting in less heat, less battery degradation, and a better battery life.

The MIC79050-4.2BM also offers under-voltage and over-voltage protections against the battery. Protection typically shuts off the output current if the voltage reaches a pre-set level. The device also includes over-temperature protection and over-current protection, which will shut off the output current if the voltage drops too low or the battery temperature is too high. This additional safety feature ensures that the system does not damage the battery or overheat itself.

Working principle

The MIC79050-4.2BM uses a Pulse Width Modulation (PWM) technique to precisely charge a Lithium-Ion/Polymer battery. The device employs a High Side N-Channel MOSFET switch, providing up to 4.2A of output current. The switching frequency is set to the optimal frequency for each cell type to deliver the best performance possible.

When the device is not in use, it is in a low power state. When a DC input voltage is received, the device is activated and the charge current is adjusted according to the internal program. The MIC79050-4.2BM then monitors the battery voltage and adjusts the charging current to maintain the programmed voltage. The MIC79050-4.2BM also keeps track of the total charge current and monitors the temperature of the device.

When the battery voltage reaches a pre-programmed level, the device will switch over to a maintenance charge. The MIC79050-4.2BM will continue to monitor the battery voltage, current, and temperature and make adjustments to ensure the battery is protected. The MIC79050-4.2BM also integrates a number of protection features, including under-voltage protection and over-temperature protection, to make sure the battery is not damaged.

The MIC79050-4.2BM features a wide voltage input range of 7V-30V, and can provide up to 4.2A of output current. It is designed to be used in portable electronic devices such as laptop computers, Camera, audio players etc. The MIC79050-4.2BM provides a reliable and efficient charging solution for single cell Li-Ion/Polymer applications.

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