MAX1647EAP

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The MAX1647EAP is an integrated DC-DC buck regulator battery charger for use in multi-cell lithium-ion applications. This device integrates an input current-control buck regulator, reverse discharge circuit, an adjustable current-limited power path, and a 3-A load switch. The topology implemented by the MAX1647EAP makes it suitable for a wide variety of applications, including removable battery packs and wearable electronics.

The MAX1647EAP requires a low voltage input voltage to operate and provides an output voltage of up to 8.4V. It implements an adjustable switching frequency, low-battery, and fault protection and monitoring. An adjustable current-limited power path allows the charger to limit the discharge current when the battery is in reverse. The charger also integrates a battery reverse-discharge circuit to prevent the battery from discharging onto the system.

The working principle behind the MAX1647EAP is based on a low-voltage dc-dc buck regulator with an adjustable switching frequency. The device uses an external N-channel MOSFET to control the input voltage and adjust the output current and voltage to match the battery’s requirements. The device monitors and allows user control of all parameters via its integrated analog and digital components.

The charger features low-battery, over-temperature, and over-current protection and monitoring, along with a number of programmable features. It supports a wide input voltage operating range from 4V to 20V and an adjustable current-limited power path that can be tuned to limit the power loss when the battery is in reverse discharge. The charger also integrates a minimum-on-time feature, which allows the charger to be programmed to stay on for a minimum amount of time and charge the battery quickly.

Additionally, the MAX1647EAP features an adjustable current limit, which enables users to set the charging current to a maximum level and prevent overcharging of the battery. The buck regulator also features a soft start, allowing it to startup with a controlled current and reduce the peak input current. The device is also protected against ESD and can be used in most portable and wearable applications, including medical systems.

The main application field of the MAX1647EAP battery charger is in removable battery packs and wearable electronics. The charger provides an efficient, cost-effective solution for keeping batteries charged and protected in applications where space and power requirements are limited. Its integrated low voltage, reverse-discharge, adjustable current-limited power path and 3-A load switch can help reduce system size and cost, while also meeting the needs of a wide variety of applications.

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