BQ24140YFFR

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PMIC (Power Management IC) battery chargers have become increasingly popular in a wide range of applications. The BQ24140YFFR is a feature-rich IC that provides system-level protection and power management capability for single cell Li-ion batteries.

The BQ24140YFFR is optimized for cost-sensitive applications and supports battery cell voltages from 2.7V to 4.2V. This patented, monolithic integrated circuit combines an internal power MOSFET switch, battery voltage regulation loop, current regulation loop, and protection circuits into a single-chip solution. The switching frequency of the power MOSFET is adjustable and the maximum duty cycle is programmable by either pin or I2C input.

The IC has excellent thermal protection and supports wide input voltage range (4.75V - 20V). It also has an integrated safety timer, undervoltage lockout (UVLO) protection and short circuit protection (SCP). The BQ24140YFFR offers low I_Q for battery charging and its low dropout regulator (LDO) provides precision regulation of battery voltage.

The BQ24140YFFR is well suited for consumer applications such as portable. With its high frequency and low ripple, the BQ24140YFFR is able to optimize efficiency while minimizing output voltage ripple and noise. It also has an integrated safety timer, undervoltage lockout (UVLO) protection and short circuit protection (SCP). The BQ24140YFFR is both I2C compatible and SPI compatible, and has been widely adopted by a variety of manufacturers who need to provide safe and reliable charging of their products.

The BQ24140YFFR works via two basic methods—charging and discharging. Charging is the process of supplying energy from an external source to refill a battery\'s energy cell, while discharging is the process of releasing energy from a battery to provide power. The IC contains an advanced protection circuitry that provides various levels of charging and discharging protection, including thermal regulation and over-discharge prevention.

In the charging process, the IC first detects the battery\'s voltage level and decides the appropriate voltage level for charging. Then, it will charge the battery with a target current and adjust the current rate gradually until a predefined voltage level is reached. The battery voltage is regulated by several protection and control loops, including the input current loop, the charging current loop and the thermal regulation loop.

The BQ24140YFFR also supports multiple battery cell technologies, including Li-ion, Li-polymer, and NiMH. The IC includes a power MOSFET switching regulator, a buck-boost converter, and an LDO linear regulator, which provide accurate voltage regulation and charging current control, even in harsh conditions. It also contains a variety of protection features to ensure optimal battery life, including over-voltage protection, over-temperature protection, weak cell detection, and short circuit protection.

In conclusion, the BQ24140YFFR is a highly integrated, feature-rich PMIC battery charger that provides system-level power management and protection for single cell Li-ion batteries. With its wide input voltage range, low I_Q and precision battery voltage regulation, the BQ24140YFFR is the ideal solution for consumer applications requiring reliable, safe charging of their products.

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