PM7744TR

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PM7744TR can be categorized as a DC-DC switching controller, a type of power management integrated circuit (PMIC - Voltage Regulators). It is a high-performance, monolithic, voltage-controlled linear regulator with integrated power switches, providing high efficiency conversion of primary battery voltage to secondary output voltages. It is ideal for mobile device applications such as smartphones, tablets, and wearable devices, where high efficiency, small package size, and weight reduction are important factors.

The PM7744TR features a 4V to 4.3V input voltage range, allowing it to operate from either a single Li-Ion battery or 2-cell Alkaline batteries. It also offers a number of different output configurations, including dual voltage outputs and synchronous rectifier outputs. The PM7744TR comes in a 3mmx4mm QFN-48 package, making it one of the smallest and lightest DC-DC switching controllers available today.

The key advantage of the PM7744TR is its high efficiency and low loop bandwidth. The switching frequency is adjustable up to 1.2MHz, allowing designers to optimize power delivery to the application’s requirements. The switching frequency can be selected to reduce soft switching losses or increase conversion frequency for low output noise. The PM7744TR also supports a wide range of output control methods, such as constant frequency or constant on-time control, pulse skipping, and pulse width modulation. The PM7744TR also offers output current limit, output voltage protection and over temperature protection.

The working principle of the PM7744TR is based on a constant frequency, constant on-time control system. The PM7744TR has an adjustable signal generator that provides the timing for the high-side N-channel MOSFETs and the low-side P-channel MOSFETs. The signal generator output is connected to the gate of the high-side MOSFET and the gate of the low-side MOSFET. The signal generator has a programmable switching frequency control which is controlled either by a resistor connected to the CS pin or through the I2C bus.

Once the switching frequency has been set, the PM7744TR will start to switch the output transistors at the set frequency. The PM7744TR will then monitor the input voltage and the output current to determine the on-time of the output transistors. The on-time of the output transistors is calculated by the PM7744TR based on the input voltage and output current conditions. The PM7744TR will adjust the on-time of the output transistors to regulate the output voltage and maintain the required output current capacity.

Once the PM7744TR has completed the conversion from input voltage to output voltage, the resulting output voltage is compared to the required set voltage. If there is a difference between the measured output voltage and the set voltage, the PM7744TR will adjust the on-time of the output transistors until the desired voltage is achieved. The PM7744TR also includes a slew rate control feature which is used to reduce output voltage noise.

In summary, the PM7744TR is a high-performance, monolithic voltage controller that provides high efficiency conversion of input voltage to output voltage. It features adjustable switching frequency up to 1.2MHz and offers several output control methods. It is ideal for mobile device applications such as smartphones, tablets, and wearable devices, where high efficiency, small package size and weight reduction are key considerations.

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