L4973D5.1 DC-DC Switching Converters by STMicroelectronics

3.5 A step down switching regulator

Status: Active
Series: L4973
RoHS: Compliant
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The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V. Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical R DS(on) of 0.15Ω) to obtain very high efficiency and very fast switching times. Switching frequency up to 300KHz are 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 40V cover the majority of the today applications. Features of this new generation of DC-DC converter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown. Packages available are in plastic dual in line, DIP- 18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly.

Prices starting from US$3.11


Distributor Starting From Stock
Logo for Farnell Farnell US$4.58
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Logo for Future Electronics Future Electronics US$4.52
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Logo for element14 element14 US$3.11
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Logo for Newark Electronics Newark Electronics -
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Features

Inhibit for zero current consumption (100mA at VCC= 24V)
Input/output synchronization function
Thermal shutdown
Protection against feedback disconnection
Soft start function
Output over voltage protection
Internal current limiting (pulse by pulse and HICCUP mode)
Zero load current operation (min 1mA)
Up to 3.5A step down converter
3.3V and 5.1V (±1%) fixed output, and adjustable outputs from: 0.5V to 50V (3.3 type)5.1V to 50V (5.1 type)
Operating input voltage from 8V to 55V
Voltage feed forward
Precise 5.1V (1.5%) reference voltage externally available
Frequency adjustable up to 300kHz

Alternative Descriptions

DC/DC CONV, BUCK, 100KHZ, SOIC-20 | Farnell
SwitchingReg,3.5A,8-55Vin,5.1V,L4973D5.1 | RS
L4973 Series 5.1 V 3.5 A Surface Mount Step Down Switching Regulator - SOIC-20 | Future Electronics
Dc-Dc Switching Buck (Step Down) Regulator, Adjustable, 8V-55Vin, 5.1V-50Vout, 3.5Aout, Soic-20 Rohs Compliant: Yes |Stmicroelectronics L4973D5.1 | Newark Electronics


Frequently Asked Questions

Where can I find additional details, specifications and documents for a L4973D5.1?

Additional datasheets, footprints and schematics for L4973D5.1 are listed on our Part Details page. You can also find images and similar parts to L4973D5.1 on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for L4973D5.1 on our Product Comparison page. Access via the 'View Pricing & Stock' button to view L4973D5.1 price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does L4973D5.1 fall under?

The L4973D5.1 is listed under Power Management > DC-DC Switching Converters > Buck Regulators.

Can I view similar or alternative parts?

You can view similar parts to L4973D5.1 when available in the Buck Regulators range under the specifications section at the bottom of the details page.

Who can I contact for technical support of the product?

Submit any questions directly to the customer support team of the distributor listing the product. For the L4973D5.1 you can contact the distributor directly for product support, shipping queries etc.

Is the L4973D5.1 RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

Which authorised distributors for L4973D5.1 have stock available?

Authorised distributors including Farnell, RS, Future Electronics, element14 and Newark Electronics have stock available or on a lead time for L4973D5.1.

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