Create a design and simulate using EE-Sim tools: MAX17681AATB+T
The MAX17681/MAX17681A is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 5W. The device operates over a wide 4.5V to 42V input and uses primary-side feedback to regulate the output voltage.
MAX17681/MAX17681A uses peak-current-mode control. The low-resistance, on-chip MOSFETs ensure high efficiency at full load while simplifying the PCB layout.
The MAX17681/MAX17681A devices generate a well regulated primary side voltage which is then scaled by a suitable transformer turns ratio to derive isolated secondary output rails. While both MAX17681AATB+T and MAX17681A support primary side overcurrent protection, the MAX17681A is an enhanced design that supports robust secondary-side overcurrent protection as well.
The MAX17681/MAX17681A is available in a compact 10-pin (3mm x 2mm) TDFN package. Simulation models are available.
How to Shrink Your Isolated Power Design with the MAX17681AATB+T Iso Buck Technology
Feature
- Reduces External Components and Total Cost
- No OptoCoupler
- 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 5W 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
- Short-Circuit Protection
- MAX17681A Supports Robust Secondary-Side Short-Circuit Protection
- MAX17681A Is Recommended for All New Designs
Applications
- Floating Power Supply Generation
- Isolated Fieldbus Interfaces
- Isolated Power Supplies in Medical Equipment
- PLC I/O Modules
- Smart Meters
