MP2637GR-Z

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MP2637GR-Z Application Field and Working Principle

The MP2637GR-Z is an integrated power management device from Monolithic Power Systems that is classified as a Power Management IC (PMIC) - Battery Charger. This chip is designed to provide an all-in-one solution for charging single-cell Li-ion batteries and is integrated with an inductor, internal voltage regulation, and current regulation for the common system requirements for the charging process. This integrated solution eliminates the need for these components to be included externally and allows for a smaller, more cost-effective design.

The MP2637GR-Z is a single-cell Li-ion battery charger that is designed with a constant current/constant voltage (CC/CV) charging profile with a programmable current limit up to 2.2A and a user-adjustableVfloat voltage. There is also integrated thermal monitoring, input current monitoring, overcharged protection, and over-temperature protection in the device. An additional feature is the adjustable frequency for reduced system EMI that can be programmed up to 2MHz.

The principles of operation of the MP2637GR-Z involve the use of a linear regulator to output a constant voltage and the power switch to convert the input voltage to a regulated output voltage. The regulator is connected in series with the power switch and acts as the current limiter by allowing the power switch’s MOSFET to turn on and off as needed to maintain the desired output voltage. The regulator can also be used to reduce the output voltage in order to prevent overcharging of the Li-ion battery.

The basic operation involves the switching of the power switch, which controls the magnitude of the output voltage. The duty cycle defines the time for which the power switch is on and off. This duty cycle is controlled by the control duty cycle, which is the ratio of the total period and the on-time period. The control duty cycle can be adjusted to increase or decrease the output voltage depending on the required charge current for the Li-ion battery.

Once the switching of the power switch is complete, the linear regulator will regulate the output voltage according to the reference voltage. So that when the output voltage is higher than the reference voltage, the linear regulator will reduce the output voltage and when the output voltage is lower than the reference voltage, the linear regulator will increase the output voltage.

Finally, to ensure that the target charge current is maintained, the MP2637GR-ZX provides an adjustable current limit. The current limit can be adjusted by changing the switch resistance, which can also be modified using an external resistance. This adjustable current limit ensures that the MP2637GR-ZX can be used in a wide variety of applications that require different charge currents.

In conclusion, the MP2637GR-Z is an integrated power management device that is classified as a PMIC – Battery Charger. This chip is designed to provide an all-in-one solution for charging single-cell Li-ion batteries and is integrated with an inductor, internal voltage regulation, and current regulation for the common system requirements for the charging process. Furthermore, the chip provides an adjustable frequency for reduced system EMI, adjustable current limit, overcharged protection, and over-temperature protection.

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