LM2798MMX-2.0

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The LM2798MMX-2.0 is a high-performance, high-efficiency, DC-DC switching regulator controller optimized to supply power to mobile devices. It incorporates a wide range of features, including comprehensive system protection, dynamic voltage scaling and enhanced transient response. With its high-accuracy current and voltage regulation capabilities, the LM2798MMX-2.0 provides an improved solution for mobile power-supply applications.

Features of Adaptive Voltage scaling

The LM2798MMX-2.0 features an adaptive voltage scaling system that allows it to optimize efficiency and supply output voltage accuracy over a wide range of input and output voltages. The controller can be programmed to operate with one external resistor, and then adapt its voltage setting based on the operating conditions. By dynamically scaling the output voltage, the LM2798MMX-2.0 can continuously monitor and adjust the output voltage in order to optimize efficiency. This on-the-fly parameter optimization also helps to minimize board space, cost, and power loss.

Independent Current Regulation

The LM2798MMX-2.0 includes an independent current regulation feature, which allows it to maintain a programmed, current-limited output even when the voltage falls below the programmed voltage. This feature helps protect the load from losin power as the input voltage drops. The controller can be programmed with one external resistor for a 1A current limit and a 0.5A current limit.

Enhanced Transient Response

To provide improved transient response, the LM2798MMX-2.0 includes a proprietary Vμ-loop®, which enables faster switching frequency and lower output voltage spikes. The controller includes a frequency compensation network that provides faster line and load transient response compared to conventional current mode PWM controllers. This helps to reduce output voltage deviations resulting from load transient and line changes.

Comprehensive System Protection

To help prevent system damage, the LM2798MMX-2.0 provides an extensive range of system protection features. These include overcurrent protection, short circuit protection, thermal shutdown protection, and voltage folding/clamping. The controller also provides an adjustable soft-start/soft-stop and programmable slew rate control to help minimize output voltage and inrush current. All of these features help to ensure safe and reliable system operation.

Application Field and Working Principle

The LM2798MMX-2.0 is ideally suited for mobile power supply applications such as smart phones and tablets, as well as automotive and industrial applications. The device can be used as either a standalone regulator, or integrated into larger power management systems. As a DC-DC switching regulator, the LM2798MMX-2.0 operates on the principle of Pulse Width Modulation (PWM) to regulate the output voltage continuously. This is done by modulating the output signal of an oscillator with a controlling voltage. When the output voltage of the PWM signal exceeds the set value, the output voltage of the regulator is reduced. Conversely, when the output voltage of the PWM signal is below the set value, the output voltage is increased. The controller also features a compensation network which helps to optimize system performance by providing a faster response time.

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