1 A step down switching regulator

The L4976 is a step down monolithic power switching regulator delivering 1A 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 Rds(ON) of 0.25W) 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 40V 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, protection against feedback loop disconnection and thermal shutdown. The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD assembly.

Key Features

  • Protection against feedback disconnection
  • and hiccup mode)
  • Thermal shutdown
  • Zero load current operation
  • Voltage feedforward
  • Up to 1A step down converter
  • Precise 5.1V reference voltage
  • Operating input voltage from 8v to 55v
  • Switching frequency adjustable up to 300kHz
  • Internal current limiting (pulse-bypulse
  • Output voltage adjustable from 0.5V to 50V

Circuit Diagram

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Design

Technical Documentation

Product Specifications
Description Version Size
DS1411 DS1411: 1A step down switching regulator 7.2 253 KB
Design Notes & Tips
Description Version Size
DN0011 DN0011: ST1S03 alternative topology: Using a buck in a negative buck-boost configuration 1.1 359 KB

Publications and Collaterals

Brochures
Description Version Size
Brochure Power management guide 05.2016 4 MB
eDesignSuite Support & Community



Sample & Buy

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
L4976 DIP-8 Tube Active - - NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
L4976D SO-16W Tube Active - - NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
L4976D013TR SO-16W Tape And Reel Active - - NEC EAR99 MALAYSIA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4976 ActiveDIP-8IndustrialEcopack2 (**)
L4976D ActiveSO-16WIndustrialEcopack1
L4976D013TR ActiveSO-16WIndustrialEcopack1
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(**) 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.

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