Product overview
Description
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.
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All features
- PROTECTION AGAINST FEEDBACK DISCONNECTION
- INHIBIT FOR ZERO CURRENT CONSUMPTION
- SOFT START FUNCTION
- THERMAL SHUTDOWN
- ZERO LOAD CURRENT OPERATION
- VOLTAGE FEEDFORWARD
- UP TO 2A STEP DOWN CONVERTER
- PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
- OPERATING INPUT VOLTAGE FROM 8V TO 55V
- SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
- INTERNAL CURRENT LIMITING (PULSE-BYPULSE AND HICCUP MODE)
- OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V
Circuit Diagram
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STMicroelectronics - L4978
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| L4978 | Active | DIP-8 | Industrial | Ecopack2 | |
| L4978D | Active | SO-16W | Industrial | Ecopack3 | |
| L4978D013TR | Active | SO-16W | Industrial | Ecopack3 |
(**) 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.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||
| L4978D013TR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| L4978 | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| L4978D | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
L4978D013TR Active
L4978 Active
L4978D Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors