2 A SWITCHING REGULATOR

The L4972A is a stepdown monolithic power switching regulator delivering 2A 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 L4972 include reset and power fail for microprocessors, feed forward line regulation, soft start, limiting current and thermal protection. The device is mounted in a Powerdip 16 + 2 + 2 and SO20 large plastic packages and requires few external components. Efficient operation at switching frequencies up to 200KHz allows reduction in the size and cost of external filter component.

Key Features

  • PWM LATCH FOR SINGLE PULSE PER PERIOD
  • UNDER VOLTAGE LOCK OUT WITH HYSTERETIC TURN-ON
  • SWITCHING FREQUENCY UP TO 200KHz
  • VERY HIGH EFFICIENCY
  • CONTINUOUS MODE OPERATION
  • THERMAL SHUTDOWN
  • RESET AND POWER FAIL FUNCTIONS
  • PRECISE 5.1V ± 2% ON CHIP REFERENCE
  • 2A OUTPUT CURRENT
  • 0 TO 90% DUTY CYCLE RANGE
  • 5.1V TO 40V OUTPUT VOLTAGE RANGE
  • INTERNAL CURRENT LIMITING
  • INPUT/OUTPUT SYNC PIN
  • INTERNAL FEED-FORWARD LINE REG.

Circuit Diagram

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Resources

Technical Documentation

Product Specifications
Description Version Size
DS0067 DS0067: 2A SWITCHING REGULATOR 3.1 1 MB
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 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
L4972A PDIP 20 Tube Active 2.033 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
L4972AD SO-20 Tube Active 2.033 1000 NEC EAR99 MALAYSIA MORE INFO DISTRIBUTOR AVAILABILITY
L4972AD013TR SO-20 Tape And Reel Active 2.033 1000 NEC EAR99 MALAYSIA 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**
L4972A ActivePDIP 20IndustrialEcopack1
L4972AD ActiveSO-20IndustrialEcopack1 (*) 0 0
L4972AD013TR ActiveSO-20IndustrialEcopack1 (*) 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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