MAX8903BETI+

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The MAX8903BETI+ is an efficient, low-cost, high-input voltage, low-power linear charger integrated circuit designed to fast-charge single-battery portable applications such as cell phones, digital still cameras, and portable media players (PMP). It is designed to charge a typical Li-Ion/Li-polymer cell at a constant current of up to 1A, and at a floating voltage up to 4.2V, by regulating the current and/or voltage to ±5%. It integrates a current source, a voltage source, an adjustable discharge switch, a battery temperature monitor, and a full-featured USB charger.

The MAX8903BETI+ electrostatic-discharge (ESD) protection features include an inherent ESD diode and the flexibility to customize the external cell-side protection circuitry. It has built-in safety features such as overcharging and overdischarging protection, programmable time limits for trickle-charge, preconditioning, charge, and top-off stages, as well as a low-battery indication feature. The charger IC also caters to High-Bandwidth Digital Content Protection (HDCP) and Digital Transmitter Compliance (DTCP) regulations that require authentication, encryption, and secure communication links between host and device. The IC is housed in a small, 44-pin, 6 mm x 6 mm, 0.5 mm lead pitch, Quad Flat No-Lead (QFN) package.

Operating Principle

The MAX8903BETI+ operates on a linear charging principle. When the external power supply is connected to the charging pins, the IC constantly monitors the cell voltage and current. The current is regulated within ±5%. If the voltage exceeds 4.2V or the current is greater than 1A, the IC switches off the transistor and shuts down the charging process. It then waits for the voltage and current to reach acceptable levels before resuming charging.

The charge current is determined by the voltage applied between the ILIM and GND pins. This voltage is a 200mV reference, generated by an internal regulator. By connecting a resistor between the ILIM and GND pins, the current limiting point can be adjusted. The discharge switch is open when the battery voltage exceeds the threshold voltage (VTH) set by the resistor on pin VIN. This pin is also used as the discharge enable control pin.

Application Field

The MAX8903BETI+ is suitable for a wide range of applications, including those requiring fast charging, such as cell phones, digital still cameras, and portable media players. It can be used in stand-alone or USB-based chargers, and in USB applications where it is important to be compliant with the HDCP and DTCP regulations. The wide range of safety features and ESD protection make the MAX8903BETI+ a suitable choice for low-cost, high-input voltage, low-power, linear charging applications.

The MAX8903BETI+ is also well-suited for applications such as portable media player (PMP) battery charging, where it can help users charge their device’s battery in a fast and efficient manner. In these applications, the IC offers several advantages, such as support for both USB-based and standalone charging, high-input voltage capability, low noise, and support for HDCP and DTCP authentication protocols.

The MAX8903BETI+ linear charger IC is also very suitable for use as a power supply and protection IC in applications such as USB Home Theater peripherals, notebook PCs and other high-performance notebooks. This is because of its low noise and voltage regulation accuracy of ±5%, as well as its ability to provide up to 4.2V output at a fast current of up to 1A. In addition, the IC also includes several safety features and ESD protection that make it suitable for use in these applications.

In summary, the MAX8903BETI+ is an efficient, low-cost, high-input voltage, low-power linear charger IC specifically designed for fast charging of single-cell battery applications such as cell phones, digital still cameras, and portable media players. It integrates several features such as a current source, a voltage source, an adjustable discharge switch, and a full-featured USB charger, as well as several safety features, making it a suitable choice for low-cost, high-input voltage, low-power, linear charging applications.

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