The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.
A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed). A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications. Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
The device is available in plastic dual in line, DIP-8 for standard assembly, and SO16W for SMD assembly.
|DS1309: 2A step down switching regulator||9.2||578 KB|
|AN1061: Designing with L4978, 2A high efficiency DC-DC convertery||9.2||793 KB|
|DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration||1.1||359 KB|
|Brochure Power management guide||09.2017||3 MB|
|Electric vehicle (EV) ecosystem||1.0||1 MB|
|Part Number||Package||Packing Type||Marketing Status||Unit Price (US$) *||Quantity||ECCN (EU)||ECCN (US)||Country of Origin||More info||Order from ST||Order from Distributors|
|L4978D013TR||SO-16W||Tape And Reel||Active : Product is in volume production||1.389||1000||NEC||EAR99||MALAYSIA||MORE INFO||Get Sample Add to cart||DISTRIBUTOR AVAILABILITY|
|L4978||DIP-8||Tube||Active : Product is in volume production||1.389||1000||NEC||EAR99||MALAYSIA||MORE INFO||Get Sample Add to cart||DISTRIBUTOR AVAILABILITY|
|L4978D||SO-16W||Tube||Active : Product is in volume production||1.389||1000||NEC||EAR99||MALAYSIA||MORE INFO||DISTRIBUTOR AVAILABILITY|
|Part Number||Marketing Status||Package||Grade||RoHS Compliance Grade||Material Declaration**|
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.