Click here to ask about the production status of specific part numbers. MAX17691A/MAX17691B 4.2V60V No-Opto Isolated Flyback Converter with Integrated FET General Description Benefits and Features Maxim s Rainier family of isolated power devices enable Reduces External Components and Total Cost cooler, smaller, and simpler power-supply solutions. The Eliminates the Optocoupler and Secondary-Side MAX17691A/B is a high efficiency No-Opto integrated Error Amplifier nMOSFET flyback converter that uses fixed frequency Up to 20% Space Savings peak current mode control. The device senses the isolated 76V, Low R Integrated nMOSFET DSON output voltage directly from the primary-side flyback wave- Internal Loop Compensation (MAX17691A) form during secondary-side rectifier conduction. No sec- Built-In Soft-Start ondary-side error amplifier and optocoupler are required Reduces Power Dissipation to provide an accurate, isolated, regulated output voltage, > 90% Efficiency saving up to 20% of PCB space normally required for a Delivers up to 7.5W Output Power traditional flyback converter. Frequency Fold-Back Enables Enhanced Light- The MAX17691A/B features a low R , 76V, 170m Load Efficiency DSON integrated nMOSFET primary switch and is designed to 2.5A Shutdown Current operate over a wide supply range from 4.2V to 60V. The Supports Key System-Level Design Requirements switching frequency of the device is programmable from Frequency Dithering Supports Low-EMI, Spread- 100kHz to 350kHz. An EN/UVLO feature allows the user Spectrum Operation to turn ON/OFF the power converter precisely at the de- Switching Frequency Synchronization to External sired input voltage. Input overvoltage protection can be Clock implemented using the OVI pin (MAX17691A only). Soft- Compliant with CISPR22 ClassB EMI Requirements start limits inrush current at startup. The MAX17691A/B Operates Reliably in Adverse Environments supports external clock synchronization to avoid low-fre- Output Diode Forward Voltage Temperature quency beats on the input bus in systems with multiple Compensation converters. The device also has programmable frequency Hiccup Current-Limit Protection dithering for low-EMI, spread-spectrum operation. Programmable EN/UVLO Threshold The MAX17691A/B allows temperature compensation for Input Overvoltage (OVI) Protection (MAX17691A) variations in the output rectifier diode forward voltage Overtemperature Protection drop. The MAX17691A is internally compensated for loop High Industrial -40C to +125C Ambient Operating stability, while the MAX17691B offers external loop com- Temperature Range/ -40C to +150C Junction pensation flexibility. The MAX17691A/B has robust hic- Temperature Range cup-protection and thermal protection schemes, and is available in a space-saving 12-pin, 3mm x 3mm TDFN Ordering Information appears at end of data sheet. package with a temperature range from -40C to +125C. Applications Isolated Power Supplies PLC I/O Modules IGBT Gate Drive Supplies Industrial and Telecom Applications 19-100784 Rev 1 2/21MAX17691A/MAX17691B 4.2V60V No-Opto Isolated Flyback Converter with Integrated FET Typical Application Circuit 3:1, 22H 18V TO 36V 5V, 1.5A D OUT Z V IN 30V 10F 2 x 100F EN/UVLO DS OVI FB MAX17691AMAX17691A 160k LX TC/V CM SS RT SET 66.5k SYNC/ VCC 2.2F 10k GND DITHER www.maximintegrated.com Maxim Integrated 2