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Analog Devices MAX17681A | Demoboard MAXREFDES1167
15V/200mA or 12V/100mA, Iso-Buck DC-DC Converter Using the MAX17681A
Overview
| Topology | FlyBuck (Double Buck) |
| Input voltage | 4.5-42 V |
Description
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. The MAX17681/MAX17681A uses peak-current-mode control. Low-resistance, on-chip MOSFETs ensure high efficiency at full load while simplifying the PCB layout.
Features
- 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
- Robust Secondary-Side Output Overcurrent Protection (MAX17681A)
- ±1.7% Feedback Accuracy
- Programmable EN/UVLO Threshold
- Adjustable Soft-Start
- Overtemperature Protection
- -40°C to +125°C Operation
Typical applications
- Isolated Power Supplies in Medical Equipment, Floating Power Supply Generation
- Isolated Fieldbus Interfaces, PLC I/O Modules
