MAX1757EAI+

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The MAX1757EAI+ is a compact, high-efficiency lithium ion/polymer battery charger IC, which is classified as PMIC – Battery chargers. It is compatible with a wide input voltage range from 2.5V to 16V and employs the SEPIC (or single-ended primary inductor converter) topology, making it suitable for a large variety of multi-cell battery stacks up to a maximum of six series cells commonly used in portable applications such as cellular phones and PDAs. It has maximum output current (IOUT) of up to 1.5A and is capable of charging Li-ion/polymer cells with minimum voltage of 3V. Maxim integrated\'s MAX1757EAI+ also features adjustable soft-start, fail-safe timer including preconditioning, and is programmable by simple external resistors.

Working principle for the MAX1757EAI+ battery charger is simple. When an input power source is applied (for instance, a DC wall adapter with an input voltage of 9V), the battery charger will use an internal power converter to convert the voltage from 9V to an appropriate voltage that is suitable for charging Li-ion/polymer batteries. The circuit will then begin to activate the charger, which is in the form of a resistor that draws current from the battery. The resistor then charges up a capacitor with a fixed time constant, resulting in a constant current being applied to the battery until it is full.When the battery is full, the charger will then turn off its internal power converter, ceasing the charging current. This cycle repeats itself over again until the battery is completely charged.

The MAX1757EAI+ battery charger is a versatile, low cost charging solution for portable applications. It provides a high-efficiency solution for charging a large range of battery types and capacities, ranging from 1 cell Li-ion/Polymer batteries to 6 cell Li-ion/Polymer battery stacks. The battery charger also features adjustable soft-start, fail-safe timer including preconditioning, and is programmable by simple external resistors, making it an extremely useful charging solution for portable applications such as cell phones and PDAs.

In addition to its wide input voltage range and adjustable current output, the MAX1757EAI+ features a safety timer that monitors the charge process and will shut down the battery charger when the programmed timer runs out. This timer is adjustable using an external resistor, and is beneficial in ensuring that the battery is not overcharged, while also providing additional assurance of safety in the event of a system malfunction. This feature is particularly useful in portable applications where overcharging can cause the battery to become unstable or even at risk for a catastrophic failure.

The MAX1757EAI+ also features a voltage regulation circuit, which provides constant voltage charging for Li-ion/polymer cells. This is especially important in combating undercharging, which can result in decreased battery life or erratic performance of the battery during usage. The voltage regulation circuit also helps to prevent voltage spikes and drops of the battery, ensuring consistent, reliable power management and circuit protection.

Overall, the MAX1757EAI+ is an efficient and reliable solution for charging Li-ion/polymer batteries in a wide range of portable applications. Its wide input voltage range and adjustable current output, safety timer, and voltage regulation circuit make it a valuable, cost-effective charging solution for a variety of portable applications.

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