The LM2743 is a high speed synchronous step-down regulator controller with accurate feedback voltage accuracy of ±2%. It can provide simple down-conversion to output voltage down to 0.6V. While the control portion of the IC is rated for 3v to 6v, the drive portion is designed to accept input power tracks up to 16v. Using an adaptive non-overlapping MOSFET gate driver helps avoid potential penetration problems while maintaining high efficiency.
Typical Application Diagram
The IC is designed for the more cost-effective option of driving only N-channel MosFeTs in high - and low-side locations. It senses a low side switching voltage drop and provides a simple, adjustable current limit. The fixed frequency voltage mode PWM control structure is adjustable from 50 kHz to 1 MHz with an external resistor.
Functional Block Diagram
This wide range of switching frequencies gives power designers the flexibility to make better trade-offs between component size, cost, and efficiency. Features include soft start, input undervoltage lock (UVLO) and Power Good (based on undervoltage and overvoltage detection). In addition, the IC's closing pin can be used to provide startup delay, and the soft start pin can be used to achieve precise tracking to achieve sequencing relative to the external track.
