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.
Key Features
Description | Version | Size |
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DS1309: 2A step down switching regulator | 9.2 | 578 KB |
Description | Version | Size |
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AN1061: Designing with L4978, 2A high efficiency DC-DC convertery | 9.2 | 793 KB |
Description | Version | Size |
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DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration | 1.1 | 359 KB |
Description | Version | Size |
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Brochure Power management guide | 05.2016 | 4 MB |
Part Number | Package | Packing Type | Unit Price (US$) * | Quantity | ECCN (EU) | ECCN (US) | Country of Origin |
---|---|---|---|---|---|---|---|
L4978D013TR | SO-16W | Tape And Reel | 1.389 | 1000 | NEC | EAR99 | MALAYSIA |
L4978 | DIP-8 | Tube | 1.389 | 1000 | NEC | EAR99 | MALAYSIA |
L4978D | SO-16W | Tube | 1.389 | 1000 | NEC | EAR99 | MALAYSIA |
Part Number | Package | Grade | RoHS Compliance Grade | Material Declaration** |
---|---|---|---|---|
L4978D013TR | SO-16W | Industrial | Ecopack1 | md_y7-wspc-so-wspc-16-wspc-.30-wspc-large-wspc-jedec-wspc-ms-013_a7y7u751ba6_signed.pdf md_y7-wspc-so-wspc-16-wspc-.xml |
L4978 | DIP-8 | Industrial | Ecopack2 (**) | md_8w-wspc-pdip-wspc-08-wspc-.3-wspc-cu-wspc-.25-wspc-au-wspc-w_cl8w-wspc-u752ba6.pdf md_8w-wspc-pdip-wspc-08-wspc-.xml |
L4978D | SO-16W | Industrial | Ecopack1 | md_y7-wspc-so-wspc-16-wspc-.30-wspc-large-wspc-jedec-wspc-ms-013_a7y7u751ba6_signed.pdf md_y7-wspc-so-wspc-16-wspc-.xml |