Click here to ask about the production status of specific part numbers. MAX17693A/MAX17693B 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 MAX17693A/B are high efficiency No-Opto integrated Error Amplifier nMOSFET flyback converters that use 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 (MAX17693A) form during the secondary-side rectifier conduction. No Built-In Soft-Start secondary-side error amplifier and optocoupler are re- Reduces Power Dissipation quired to provide an accurate, isolated, regulated output Delivers up to 1.4W Output Power voltage, saving up to 20% of PCB space normally required Frequency Fold-Back Enables Enhanced Light- for a traditional flyback converter. Load Efficiency The MAX17693A/B feature a low R , 76V, 245m in- 2.5A Shutdown Current DSON tegrated nMOSFET primary switch and are designed to Supports Key System-Level Design Requirements operate over a wide supply range from 4.2V to 60V. The Frequency Dithering Supports Low-EMI, Spread- switching frequency of the device is programmable from Spectrum Operation 100kHz to 350kHz. An EN/UVLO feature allows the user Switching Frequency Synchronization to External to turn ON/OFF the power converter precisely at the de- Clock sired input voltage. Input overvoltage protection can be Operates Reliably in Adverse Environments implemented using the OVI pin (MAX17693A only). Soft- Output Diode Forward Voltage Temperature start limits inrush current at startup. The MAX17693A/B Compensation support external clock synchronization to avoid low-fre- Hiccup Current-Limit Protection quency beats on the input bus in systems with multiple Programmable EN/UVLO Threshold converters. The devices also have programmable fre- Input Overvoltage (OVI) Protection (MAX17693A) quency dithering for low-EMI, spread-spectrum operation. Overtemperature Protection The MAX17693A/B allow temperature compensation for High Industrial -40C to +125C Ambient Operating variations in the output rectifier diode forward voltage Temperature Range/ -40C to +150C Junction drop. The MAX17693A is internally compensated for loop Temperature Range stability, while the MAX17693B offers external loop com- pensation flexibility. The MAX17693A/B have robust hic- Ordering Information appears at end of data sheet. cup-protection and thermal protection schemes, and are available in space-saving 12-pin, 3mm x 3mm TDFN packages with a temperature range from -40C to +125C. Applications Isolated Power Supplies PLC I/O Modules IGBT Gate Drive Supplies Industrial and Telecom Applications 19-101081 Rev 0 4/21MAX17693A/MAX17693B 4.2V60V No-Opto Isolated Flyback Converter with Integrated FET Typical Application Circuit 1:0.45, 100H 18V TO 36V 5V, 0.25A D OUT Z VIN 33V 4.7F 47F EN/UVLO D S OVI FB MAX17693AMAX17693A 120k LX TC/VCM SS RT SET SYNC/ V 66.5k 2.2F CC 10k GND DITHER 0.1F www.maximintegrated.com Maxim Integrated 2