Isolated flyback with integrated switch — what it is and where it fits
The Analog Devices MAX17691BATC+ is an isolated flyback switching regulator with an internal power switch, designed for isolated DC-DC supplies up to 7.5 W. It accepts a 4.2 V to 60 V input.
7.5 W output — what it can drive
7.5 W is enough for bias rails in motor drives, gate-drive supplies for IGBTs or SiC FETs, auxiliary housekeeping in telecom bricks, or isolated sensor power in industrial field transmitters.
Wide input range and temperature grade
The 4.2 V to 60 V input range handles cranking and load-dump transients on automotive buses without external clamping. The -40°C to 125°C operating temperature range suits under-hood automotive, outdoor telecom cabinets, and factory-floor enclosures.
Fault protection and control features
Built-in fault protection covers current limiting, over-temperature, and over-voltage — three common failure modes in isolated supplies. The enable (EN) pin and soft-start control let the system sequencer hold off the output until the upstream rail is stable, reducing inrush on the input bus.
Package and rework considerations
The 12-TDFN (3x3 mm) package has an exposed pad underneath for thermal dissipation. It is a surface-mount part, and the pad is the main heat path — make sure the PCB has a thermal via array under the part.
Lifecycle and sourcing
No end-of-life notice or last-time-buy window is in effect.