MAXREFDES1046: wide input range, 3.3V/3A output synchronous rectification, step-down DC-DC converter, two-layer circuit board design to reduce costs

MAXREFDES1046 is based on the high-voltage, synchronous rectification buck converter MAX17574, which implements efficient DC-DC step-down conversion and outputs 3.3V@3A. To reduce costs, this reference design provides a 2-layer PCB layout and complete test data. MAX17574 has a built-in MOSFET and operates in the input voltage range of 4. 5V to 60V. The output voltage can be set from 0.9V to 90%VIN. This reference design uses a fixed output of 3. 3V. The device operates over the -40°C to +125°C temperature range, and the feedback voltage regulation accuracy is within ±0.9%. The MAX17574 uses a peak current control architecture. The device can operate in pulse width modulation (PWM), pulse frequency modulation (PFM) or discontinuous conduction (DCM) modes. The programmable soft-start function allows users to reduce input inrush current, and provides an output enable/undervoltage lockout control pin (EN/UVLO), allowing users to turn on the power supply when the input voltage reaches the corresponding requirements. When the output voltage reaches the regulated range, the RESET output is triggered after a certain delay to provide a power-ready indication for the system.

Key Features

• ·  2-layer board layout reduces power consumption

• ·  Reduce the number of external components and reduce overall cost

• ·  Reduce the inventory quantity of DC-DC regulators

• ·  Reduce power consumption

• ·  Ensure reliable operation in harsh industrial environments