LV5762QA-NH

LV5762QA-NH Application Field and Working Principle

The LV5762QA-NH is an advanced PWM controller IC designed for DC/DC converters. It is a low current consumption type IC in the MOTOROLA series and is applied for 3V power supply voltage. This high performance IC was developed for designs that require optimized package size and low quiescent current.

Application Field of LV5762QA-NH

The LV5762QA-NH is used in power supply systems where a DC/DC converter is necessary. Since it is a low current consumption type IC, it is ideal for battery powered systems. It can be used for various applications such as LCD monitors, mobile devices, POS terminals, and so on.

Working Principle of LV5762QA-NH

The LV5762QA-NH is an advanced PWM controller designed to minimize output ripple voltage. To achieve this, it incorporates optimal operating points and maximum available operating frequency. It also has integrated soft start circuit and frequency dithering capability for higher system efficiency.

The LV5762QA-NH utilizes one independent voltage regulator (OG) to regulate the drain voltage (VDD) of its internal MOSFET or N-channel MOSFET (NMOS). When the main operating point is reached, the voltage across the NMOS is minimized, resulting in a higher efficiency. It also reduces switching losses due to its low gate charge. Furthermore, built-in frequency dithering circuit helps to reduce switching losses.

Apart from the OG voltage regulator, the LV5762QA-NH also incorporates two adaptive voltage regulators; Internal MOSFET (IMOS) and Primary Regulator (PR). The IMOS regulates the low side of the NMOS and the PR regulates the high side of the NMOS while also controlling the output voltage range. The voltage overshoot protection enabled by PR helps to prolong the lifetime of the NMOS and reduce the probability of output voltage malfunction.

In addition, the LV5762QA-NH also has a dedicated voltage loop for low current load applications. This particular loop performs well in low current load applications like mobile device and POS terminal, where high current draw from the load could lead to output voltage drop.

The soft start circuit of LV5762QA-NH was designed for faster current ramp-up to allow for a safe startup procedure and monitoring when the system is powered up. It also eliminates any inrush current and minimizes output voltage overshoot caused by sudden increase in the load current.

The LV5762QA-NH also provides overcurrent protection, thermal shutdown, and an undervoltage lockout (UVLO), providing system safety and reliability. Furthermore, integrated overvoltage protection protects the system from damages due to abrupt increase of the output voltage.

Conclusion

The LV5762QA-NH is a high performance 3V PWM controller IC, developed for designs that require optimized package size and low quiescent current. With its advanced features such as voltage regulator, frequency dithering, soft start circuit, low current load applications, overcurrent protection, thermal shutdown, and undervoltage lockout, the LV5762QA-NH is the ideal choice for DC/DC converters in various applications.