MAX1873TEEE+

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The MAX1873TEEE+ is a power management integrated circuit (PMIC) specifically designed to charge lithium-ion (Li+) batteries. Operating from a supply voltage of 2.6V to 5.5V, it is suitable for applications including wireless handsets, digital still cameras, PDAs, and portable medical devices. The integrated design minimizes the external components and cost, thus enlarging the range of applications in which it can be used. This article will discuss the application field and working principle of the MAX1873TEEE+.

Application Field of MAX1873TEEE+

The MAX1873TEEE+ is a PMIC designed specifically for battery charging applications. It is designed to charge a single Li+ cell, or several Li+ cells connected in series or parallel, with a charge current of up to 500mA. The MAX1873TEEE+ is also designed to provide power conversion and protection functions to support Li+ cell-based power sources in portable applications. It incorporates a precision input voltage regulation circuit, a low dropout-based DC-DC converter, and a battery-charging controller. It provides fast charge termination, as well as overcharge, overcurrent, and over-temperature protection. All of these features make the MAX1873TEEE+ suitable for use in Li+ battery charging applications in wireless handsets, digital still cameras, PDAs, and portable medical devices.

Working Principle of MAX1873TEEE+

The MAX1873TEEE+ is a charge-only PMIC for one Li+ cell, or up to four Li+ cells connected in series or parallel. Its main components are a precision voltage regulator, a low dropout-based DC-DC converter and a battery charging controller. It provides flexible inputs, comprehensive safety features and programmable control features. It can be further customized with an external control pin\'s voltage. It is able to operate down to 2.6V and supply up to 500mA to the Li+ cell(s). It comes with selectable charge terminations and overcharge, overcurrent, and over-temperature protection.

The precision voltage regulator supplies the power for the DC-DC converter and the charging circuitry. Its output voltage is preset to 5V and can be externally adjusted. The internal error amplifier of the voltage regulator sets the voltage to the voltage needed by the Li+ cell to be charged. The DC-DC converter then steps down this voltage to the required charge voltage and supplies it to the charging circuitry, while the charging controller provides circuitry to accurately monitor the Li+ cell\'s charging process.

The charging controller uses an internal voltage divider to set the current, as well as an internal voltage-comparator which compares the battery voltage with internal references and limits the current when an over-voltage condition is detected. The current limit is set according to the voltage divider ratio and can thus be programmed. The charging controller is also able to recognize the end-of-charge condition and perform top-off charging. The charge cycle may be terminated with a timer, by the voltage comparator, or manually via the MODE pin.

In summary, the MAX1873TEEE+ is a PMIC intended for Li+ battery charging applications. It integrates a precision voltage regulator, a low dropout-based DC-DC converter, and a battery-charging controller, as well as selectable charge terminations and overcharge, overcurrent, and over-temperature protection. It is suitable for use in wireless handsets, digital still cameras, PDAs, and portable medical devices.

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