MAX17681

MAX17681 4.5V to 42V Input, High-Efficiency, Iso-Buck DC-DC Converter General Description The MAX17681 is a high-voltage, high-efficiency, isobuck DC-DC converter designed to provide isolated power up to 3W. The device operates over a wide 4.5V to 42V input and uses primary-side feedback to regulate the output voltage. The MAX17681 uses peak-current-mode control. The low-resistance, on-chip MOSFETs ensure high efficiency at full load while simplifying the PCB layout. The device is available in a compact 10-pin (3mm x 2mm) TDFN package. Simulation models are available. Applications ●● Isolated Fieldbus Interfaces ●● PLC I/O Modules ●● Smart Meters ●● Isolated Power Supplies in Medical Equipment ●● Floating Power Supply Generation Ordering Information appears at end of data sheet. Application Circuit Benefits and Features ●● Reduces External Components and Total Cost No Opto-Coupler Synchronous Primary Operation All-Ceramic Capacitors, Compact Layout ●● Reduces Number of DC-DC Regulators to Stock Wide 4.5V to 42V Input 0.9V to 0.96 x VIN Primary Output Voltage Delivers Up to 3W Output Power ●● Reduces Power Dissipation Peak Efficiency > 90% 0.9μA (typ) Shutdown Current ●● Operates Reliably in Adverse Industrial Environments Peak and Sink Current-Limit Protection ±1.7% Feedback Accuracy Programmable EN/UVLO Threshold Adjustable Soft-Start Overtemperature Protection -40°C to +125°C Operation VIN 17V TO 32V C1 1µF VIN EN/UVLO LX PGN...