MAX14748EWW+T

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The MAX14748EWW+T is an advanced power management integrated circuit (PMIC) specifically designed to meet the energy efficiency and space requirements of portable equipment. This device is used in applications such as portable computers, mobile phones, PDAs, digital cameras and audio players, where it supports the charging of multiple batteries, including Li-Ion and NiMH chemistries. The device offers a high degree of integration and performance, while minimizing space and cost.

The MAX14748EWW+T is a power charger and management IC. It has three different channels of constant current and voltage charging that support both Li-Ion and NiMH battery chemistries. It provides a step-down switching regulator and two LDO regulators for powering system peripheral components. It also features over-voltage, over-current and battery temperature protection for enhanced system reliability.

The MAX14748EWW+T has several features designed to enhance its performance in battery management applications. The main features include:

• A dual input current-limiting switch to provide two or more charging paths for improved charge current control and precise termination
• A low power mode for low power consumption when an external power source is not available
• Programmable input current limit and battery charge current monitor to detect over-current conditions
• An auto-shutdown feature that influences the maximum duty cycle of the inductor to reduce power consumption
• Pre-charge, constant current and constant voltage charge cycle stages for improved accuracy in the termination of the charge cycle
• An adjustable (accurate to 1kHz) switching frequency that allows a wide range of input voltage options
• Battery temperature monitoring to prevent battery overload
• Short-circuit protection for additional protection and safety

The MAX14748EWW+T works on the principle of charge-pump battery charging. Charge-pump battery chargers are designed to transfer energy from a higher voltage source and to distribute it to two or more channels operating at different voltages. Each channel can provide up to 2.5A of charge current and supports Li-Ion and NiMH chemistries. During the charging operation, the MAX14748EWW+T tracks the battery voltage and current, and adjusts the charging current accordingly. This ensures that the charge current is tailored to the condition of the battery.

The MAX14748EWW+T is a very efficient device, achieving up to 90% efficiency. A key feature that helps to improve the efficiency of this device is the use of an auto-shutdown mechanism that dynamically adjusts the duty cycle of the inductor to reduce power consumption. This allows the device to reduce power consumption during periods of low-load current.

In addition to its battery charging capabilities, the MAX14748EWW+T also provides two low-dropout voltage regulators (LDOs), with a maximum output current of 400mA. These outputs are ideal for powering peripherals that are not charged through the battery charger. The LDOs have low output noise, high current ripple rejection, and programmable voltage settings. Furthermore, the device also features short-circuit protection to protect against short-circuits from the battery or external current source.

The applications of the MAX14748EWW+T PMIC-Battery charger are mainly focused on products that require a high level of power management and energy efficiency. This includes portable devices such as cell phones, PDAs, digital cameras, and audio players. These applications typically require a low power consumption, tight voltage regulation, and a high capacity for charging. The MAX14748EWW+T delivers on all fronts, making it an ideal solution for these types of applications.

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