LT3650EMSE-4.2#TRPBF

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Battery chargers are electronic devices used to convert power from one form to another, typically converting AC to DC power, in order to charge batteries. The LT3650EMSE-4.2#TRPBF (LT3650) is an integrated battery charger and system power management IC used in a variety of applications including smartphones, PDAs, and other portable devices. It is designed to reduce board space and cost while at the same time offering a high level of flexibility and advanced features.

Overview

The LT3650 is a bipolar, synchronous step-down PWM controller with integrated Li-Ion battery charger. Its integrated PWM controller provides high efficiency and fast transient response. It also has an advanced analog current sense design for accurate control of the charging current. The LT3650 supports a wide variety of external power sources including AC/DC adapters, USB ports, and wall chargers. Its high level of integration allows for a low component count and cost savings. The LT3650 is well-suited for today\'s increasingly demanding power management applications.

Features

The LT3650 offers a wide range of features and benefits:

• High integration: 8V to 18V operation, 4.2V to 18V input voltage range, 0.8V to 5.5V output voltage range, and up to 3A charge current.
• High efficiency PWM controller: Low standby current, up to 88% efficiency, and cycle-by-cycle current limiting.
• Power management: BatteryPreCharge, SoftStart and ACOK detection.
• Accurate current and voltage regulation: Advanced analog current sense for accurate control of the charging current and 0.4% accuracy on the voltage regulation.
• Reset control: Programmable reset output voltage, RESET assertion delay and RESET de-assertion delay.

Application Field and Working Principle

The LT3650 is designed for use in applications such as smartphones, PDAs, and other portable devices. It can be used to provide a constant output voltage for charging the battery, as well as regulating the output voltage to prevent it from exceeding the battery\'s maximum voltage. The LT3650 is a synchronous buck converter, which means it takes the high input voltage and steps it down to the desired output voltage. This is done by switching a field-effect transistor (FET) on and off rapidly, which creates high frequency pulses that can be regulated to a specific voltage. The LT3650 uses current-mode, frequency modulated, pulse width modulation (PFM) to regulate the output voltage.

The LT3650 has two operating modes, normal and battery precharge mode. In normal mode, the output voltage is monitored and regulated using the PFM control loop. In battery precharge mode, the output voltage is limited to a fixed precharge voltage and can be used to charge critically discharged batteries. In both modes, the LT3650 monitors the battery voltage during charging and automatically protects against over charging and over current conditions.

Conclusion

The LT3650EMSE-4.2#TRPBF is a high integration and cost-efficient battery charger and system power management IC. It is well-suited for applications such as smartphones, PDAs and other portable devices. It offers a wide range of features including high efficiency PWM control, advanced analog current sense, power management and reset control. The LT3650 is an ideal solution for reducing board space and cost while still offering advanced features.

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