Multi-topology PWM controller for flexible power conversion
The LT8711IFE#PBF from Analog Devices is a single-output PWM controller that handles step-up, step-down, buck-boost, and SEPIC topologies — one part covers multiple power-rail architectures without respinning the board. It operates from a 4.5V to 42V supply rail, switching between 100kHz and 750kHz with clock sync support for noise-sensitive systems. The 20-TSSOP package with exposed pad helps pull heat into the PCB ground plane, and the junction temperature range of -40°C to 125°C suits automotive and industrial environments where the ambient hits the high side.
Wide 4.5V–42V supply — what it means for the BOM
The 4.5V to 42V Vcc/Vdd range is the headline number for fit. It covers 12V and 24V industrial buses, automotive battery rails during cold-crank and load-dump transients, and battery-powered systems that sag below 5V. The 100% duty cycle capability lets the controller pass the input straight through in dropout, useful when the input dips close to the output target. No synchronous rectifier on-chip — you add external MOSFETs and catch diodes; the controller drives them with a PWM signal.
Active production — no LTB risk
Marked as current/active in the lifecycle record. No last-time-buy notice on file, no NRND flag.
20-TSSOP-EP — thermal and layout notes
The exposed pad on the 20-TSSOP is the primary thermal path. The PCB layout should stitch vias under the pad to the ground plane — without that, junction temperature climbs fast above 400mA continuous external load. The Tube delivery means parts arrive loose in a plastic tube; no tape-and-reel, so pick-and-place requires a tube feeder or manual handling.