MAX1879EUA+

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MAX1879EUA+ Battery Chargers

The MAX1879EUA+ battery charger is a popular PMIC (Power Management Integrated Circuit) by Maxim Integrated. It’s a highly versatile battery charger solution engineered to work with Lithium-ion/polymer batteries in battery-powered applications ranging from low power wearable devices to high capacity electric vehicles. Featuring a buck-boost architecture that keeps output current level independent of application voltage, MAX1879EUA+ boasts of higher accuracy and stability under changing environmental conditions compared to its predecessors.

Product Features:

• Switching frequency of 2.25 MHz allows for the use of ultra-small components in applications with compact size.
• High efficiency and low noise operation over a wide range of load conditions resulting in reduced power consumption and heat generation.
• It has a wide input voltage range of 4.5V to 28V and a wide battery charging range of 3.0V to 19.2V, making it suitable for a variety of battery chemistries and configurations.
• Quad-Channel Battery Management and Monitoring: Supports up to 4 batteries at the same time, it offers full protection including complete charge control, precise current and voltage regulation, and independent battery cell balancing.

Applications:

MAX1879EUA+ is ideal for wearable devices, medical equipment, power banks, drones, and electric vehicles, among many others. Its small form factor and high efficiency make it capable of providing good results in a wide range of applications.

Working Principle:

The working principle of the MAX1879EUA+ is based around a buck-boost architecture. The circuit is designed to change the output current level depending on the application voltage. This makes it reliable and stable even when the environmental conditions vary significantly. The system is composed of a single-cell charger, a default buck-boost regulator, and a four-channel open drain balance output. It uses a variable frequency, variable duty cycle PFM (pulsed frequency modulation) scheme for the single-cell charger, and the regulation is achieved by adjusting the duty cycle. The four-channel open drain balance output allows for battery balancing and monitoring in up to four cells at a time.

The buck-boost architecture coupled with very few external components provides a advantages, such as low quiescent current and improved light-load operating efficiency, as well as increased flexibility and accuracy in adjustable settings. In addition, the device supports thermal and short-circuit protection, and alarm indicating undervoltage lockout and linear termination.

Conclusion:

The MAX1879EUA+ is a great choice for a variety of battery-powered applications. It offers high efficiency, low quiescent current, and improved light-load operating efficiency coupled with a versatile buck-boost architecture. The device also features a wide input voltage range, wide battery charging range, and four-channel open drain balance outputs making it suitable for a variety of battery chemistries and configurations. All these features make MAX1879EUA+ a great choice for efficient and reliable battery charging.

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