L4976

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1 A step down switching regulator

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Product overview

Description

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.

  • All 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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STMicroelectronics - L4976

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L4976D
Active
SO-16W Industrial Ecopack3
L4976D013TR
Active
SO-16W Industrial Ecopack3

L4976D

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

Ecopack3

L4976D013TR

Package:

SO-16W

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SO-16W

Grade

Industrial

RoHS Compliance Grade

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.

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