LM2722MX

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Power management integrated circuits (PMICs) are specialized semiconductor components developed to improve the efficiency and effectiveness of the power supply systems of devices and equipment of all sizes. PMICs offer complete solutions for different power requirements, from voltage conversion and regulation to monitoring and protection, making them essential elements for the development of robust power supply systems. Gate Drivers, which are part of the PMIC family, are specifically implemented to drive switching transistors and gate-controlled thyristors.

Texas Instruments LM2722MX is a cost-effective, high-performance Gate Driver PMIC. This integrated circuit is designed for digital power management systems in applications where high reliability requirements, low operating costs and small footprints are essential. In terms of electrical characteristics, the LM2722MX is capable of driving MOSFET and IGBTs with a minimum voltage of 8 V up to 20 V, an output of 4A peak and a power dissipation of 3.2 W. In addition, it can provide an output current of 60 mA with an adjustable dead time of up to 1.3 µs.

The LM2722MX PMIC can be used in a variety of applications, ranging from industrial motor controllers to distributed power generation systems. Its high performance and efficiency can be especially important for applications such as solar inverters, where the Maxim Integrated power management solutions are complemented by generated energy from solar panels. In systems such as these, the LM2722MX can help reduce EMI emissions, helping the overall system meet industry compliance requirements.

The LM2722MX is based on the PWM synchronous buck architecture, an ideal platform for maximizing energy efficiency while switching high frequency. Its operation is based on a non-inverting nominal resonant architecture, with dead-time compensation, an input Voltage Regulation Loop (VRL) for current control and a Switch-Mode Control Loop with feed-forward for voltage control. When used as a synchronous bias, the LM2722MX compensates for the forward voltage drop of the MOSFETs. This is especially useful for reducing power losses in ultra-low dropout (ULDO) regulators.

The LM2722MX is comprised of three consecutive stages that operate sequentially. First, the start-up circuit, powered by a low voltage charge pump, triggers the internal start-up transistor that, in turn, starts the supply process. After the start-up process is complete, the gate driver stage is activated. This stage is responsible for supplying the gate of the external power switches, activating and deactivating the same in accordance with the control logic of the PMIC. Finally, a low quiescent current linear regulator generates the logic supply voltage necessary for the PMIC.

The LM2722MX PMIC can also integrate advanced functions such as fault detection and protection systems, which work according to the type of application and the nature of the external load. When configured as a quasi-resonant converter, the LM2722MX can provide Low-Voltage Balanced (LVAL) current-mode control, allowing for fast line and load regulation capabilities. Additionally, this PMIC features a built-in interlock feature, which allows for additional control over the switching times of the output switches to reduce ringing and EMI-related problems.

In terms of external components, the LM2722MX requires few external components, including an input bypass capacitor, an output power inductor and a rectifier diode. This PMIC also incorporates an over-current protection circuit and an auxiliary winding for sensing the voltage at the output stage. All these features enable the LM2722MX to deliver high performance, while providing high efficiency, low power loss and enhanced system protection.

The LM2722MX is an excellent example of a high-performance Gate Driver PMIC. It achieves high efficiency using a non-inverting nominal resonant architecture that compensates for the forward voltage drop of the MOSFETs, while providing an adjustable dead time of up to 1.3 µs. Additionally, it provides advanced features such as fault detection and protection systems and an interlock feature to reduce ringing and EMI-related issues. The LM2722MX can also be integrated with solar inverters and other applications, helping them meet compliance requirements, while providing high performance and efficiency.

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