L4972

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

Download

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DS0067: 2A SWITCHING REGULATOR	3.1	1 MB

Design Notes & Tips

	Description	Version	Size
	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
	Electric vehicle (EV) ecosystem	1.1	1 MB

Sample & Buy

Part Number	Package	Packing Type	Marketing Status	Unit Price (US$) *	Quantity	ECCN (US)	Country of Origin	More info	Order from ST	Order from Distributors
L4972A	PDIP 20	Tube	Active : Product is in volume production	2.033	1000	EAR99	MALAYSIA	MORE INFO		DISTRIBUTOR AVAILABILITY
L4972AD	SO-20	Tube	Active : Product is in volume production	2.033	1000	EAR99	MALAYSIA	MORE INFO	Buy Direct Add to cart	DISTRIBUTOR AVAILABILITY
L4972AD013TR	SO-20	Tape And Reel	Active : Product is in volume production	2.033	1000	EAR99	MALAYSIA	MORE INFO	Get Sample Add to cart	DISTRIBUTOR AVAILABILITY

(*) 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
L4972A	Active	PDIP 20	Industrial	Ecopack1
L4972AD	Active	SO-20	Industrial	Ecopack1 (*)
L4972AD013TR	Active	SO-20	Industrial	Ecopack1 (*)

(**) 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.