5 A switching regulator

The L4975A is a stepdown monolithic power switching regulator delivering 5A at a voltage variable from 5.1 to 40V.

Realized with BCD mixed technology, the device uses a DMOS output transistor to obtain very high efficiency and very fast switching times. Features of the L4975A include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a 15-lead multiwatt plastic power package and requires few external components. Efficient operation at switching frequencies up to 500KHz allows reduction in the size and cost of external filter component.

Key Features

  • UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON
  • INPUT/OUTPUT SYNC PIN
  • VERY HIGH EFFICIENCY
  • PWM LATCH FOR SINGLE PULSE PER PERIOD
  • THERMAL SHUTDOWN
  • SWITCHING FREQUENCY UP TO 500KHz
  • CONTINUOUS MODE OPERATION
  • RESET AND POWER FAIL FUNCTIONS
  • PRECISE 5.1V ± 2% ON CHIP REFERENCE
  • 5A OUTPUT CURRENT
  • 0 TO 90% DUTY CYCLE RANGE
  • 5.1V TO 40V OUTPUT VOLTAGE RANGE
  • INTERNAL CURRENT LIMITING
  • SOFT START
  • INTERNAL FEED-FORWARD LINE REG.

Circuit Diagram

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Resources

Technical Documentation

Product Specifications
Description Version Size
5A switching regulator 1.2 6 MB
Design Notes & Tips
Description Version Size
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 09.2017 3 MB
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
L4975A MW 15L Tube Active 6.798 1000 NEC EAR99 MOROCCO MORE INFO 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**
L4975A ActiveMW 15LIndustrialEcopack1 0 0
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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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