The API9221 is a versatile multi-input lithium battery charger capable of being powered by either a car or wall adapter, as well as through a USB connection. This advanced device features a range of protective mechanisms, including over-voltage protection for USB at 5.4V and wall adapters at 6.9V. It can handle input voltages safely up to 28V and supports a maximum fast charging current of 1.2A. The charging current and termination can be individually programmed using external resistors, while reverse current protection and thermal management ensure reliable operation.
Key features of the API9221 include:
• A linear Lithium-Ion/Lithium-Polymer charging IC
• Dual power inputs for seamless integration into portable devices
• Over-voltage protection for USB (5.4V) and wall adapters (6.9V)
• Safe input up to 28V
• High-speed charging capability with a maximum current of 1.2A
• Built-in 4.9V linear regulator with a 10mA current limit
• Separate resistors for programming charging current from wall and USB
• Adjustable charge termination via external resistors
• Current limiting in the USB bypass mode
• Indicators for charging status and power availability
• An enable pin allowing host control over charging
• Protection against reverse current flow
• Thermal protection mechanisms
• Environmentally friendly "Green" molding compound (RoHS compliant, lead-free)
The API9221 finds applications in a variety of handheld consumer electronics such as cell phones, PDAs, MP3 players, portable testing tools, digital cameras, and multimedia players. Its robust design ensures it operates efficiently across a wide range of temperatures and conditions, making it suitable for modern portable devices.
Below is a functional block diagram illustrating the internal architecture of the API9221.
This chip is ideal for integrating into products where space is limited but performance and reliability are critical. With its ability to adapt to different power sources and its comprehensive safety features, the API9221 represents a significant advancement in lithium battery charging technology. Whether you're designing a new smartphone or a portable music player, the API9221 offers a reliable solution for all your charging needs.
In conclusion, the API9221 is not just a lithium battery charger; it’s a smart, feature-packed component that brings efficiency and safety to any portable electronic device. Its compact design and diverse capabilities make it an excellent choice for a wide array of applications.
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