MAX1647EAP+T

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Power Management Integrated Circuit (PMIC) technology has advanced significantly over the past few years, and one notable example is the MAX1647EAP+T. This highly efficient, monolithic DC-DC converter is designed to optimize power delivery for both existing and emerging battery applications, and it offers a maximum output of up to 200mA. The MAX1647EAP+T is well-suited for use in a variety of different applications and is specifically designed for charging Li-ion, Li-polymer and NiMH batteries.

Application Field

The MAX1647EAP+T is a cost-effective battery charging solution for both portable electronics and embedded systems and is designed to provide a regulated current to batteries with voltages ranging from 3.3V to 8.4V. It is also versatile enough to be used in a wide range of applications, such as: cell phones, smartphones, personal digital assistants (PDAs), portable navigation systems, cameras, medical devices, and power tools. It is perfect for the mobile device market and can provide flexible, integrated power management solutions for all of these applications.

The MAX1647EAP+T has a wide operating voltage input range from 3V–20V and features an integrated, general-purpose power switch. It is capable of charging most popular battery types – such as Li-ion, Li-polymer, and NiMH – and can deliver up to 200mA of constant current. It is also capable of supporting pre-charge and trickle charging modes, as well as adding a host of features to enable functional safety and enhanced system performance. Additionally, the device can be placed in a sleep mode for power-down conditions.

Working Principle

The MAX1647EAP+T operates on the flyback topology, meaning that the voltage applied to the input of the device is converted to a higher voltage at the output. The device consists of an internal pulse-width modulation (PWM) controller, which has a minimum of two high-side MOSFETs, one of which is used to control the charge current and the other to control the voltage. The device also features several integrated functions such as over-voltage protection, short-circuit protection and over-temperature protection.

The device contains an integrated soft-start circuit that prevents inrush currents from damaging the components in the system. It uses an adjustable current sense circuit to monitor the battery current during charging and ensure that the rate of charge does not exceed a safe level. The device also has a power-path management feature, which allows the device to continue to provide power to the system during a power cut.

The MAX1647EAP+T features an active power-down mode to conserve device power, and an enable pin for load switching. The device also contains status and fault pins which can be monitored to determine whether the device is charging correctly, and diagnostic functions to identify clear sources of error. Additionally, the device is equipped with adjustable voltage regulation, charge current regulation and thermal shut-down to protect the system from potential damage.

The MAX1647EAP+T is a cost-effective, flexible and efficient power management solution for charging Li-ion, Li-polymer and NiMH batteries. It is designed to interface with any DC-DC converter, and its wide input voltage range and integrated protection and diagnostic functions make it well-suited for many existing and emerging battery applications.

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