L7987

61 V 3 A asynchronous step-down switching regulator with adjustable current limitation

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The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC. The output voltage adjustability ranges from 0.8 V to V_IN. The wide input voltage range and the 100% duty cycle capability meet the fail safe specifications for industrial systems. The embedded switchover feature on the V_BIASpin maximizes the efficiency at light load. The adjustable current limitation, designed to select the inductor RMS current accordingly with the nominal output current, and the high switching frequency capability make the size of the application compact. Pulse-by-pulse current sensing with digital frequency foldback implements an effective constant current protection over the different application conditions. The peak current foldback decreases the stress of the power components in heavy short-circuit condition. The PGOOD open collector output can also implement output voltage sequencing during the power-up phase. Multiple devices can be synchronized sharing the SYNCH pin to prevent beating noise in low noise applications like sensors with A/D conversion.

Key Features

3 A DC output current
4.5 V to 61 V operating input voltage
R_DS,ON= 250 mΩ typ.
Adjustable f_SW(250 kHz - 1.5 MHz)
Low IQ-SHD (11 μA typ. from V_IN)
Low IQ (1 mA typ. - V_IN24 V - V_OUT3.3 V)
Output voltage adjustable from 0.8 V to V_IN
Synchronization
Adjustable soft-start time
Adjustable current limitation
Low dropout operation (12 μs max.)
V_BIASimproves efficiency at light load
PGOOD open collector output
Output voltage sequencing
Digital frequency foldback in short-circuit
Peak current foldback in short-circuit
Auto-recovery thermal shutdown

Resources

Technical Documentation

Product Specifications

	Description	Version	Size
	DS10053: 61 V 3 A asynchronous step-down switching regulator with adjustable current limitation	3.0	2 MB

HW Model, CAD Libraries & SVD

	Description	Version	Size
	L7987 Pspice model	1.0	241 KB

Publications and Collaterals

Flyers

	Description	Version	Size
	DC-DC converters		557 KB

Brochures

	Description	Version	Size
	Brochure Power management guide	09.2017	3 MB
	Electric vehicle (EV) ecosystem	1.1	1 MB

Tools and Software

Evaluation Tools

Solution Evaluation Tools

Part Number	Manufacturer	Description
STEVAL-ISA152V1		3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987

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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
L7987TR	HTSSOP16	Tape And Reel	Active : Product is in volume production	1.25	1000	EAR99	-	MORE INFO		DISTRIBUTOR AVAILABILITY
L7987	HTSSOP16	Tube	Active : Product is in volume production	1.25	1000	EAR99	-	MORE INFO	Buy Direct 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	Material Declaration**
L7987TR	Active	HTSSOP16	Industrial	Ecopack2
L7987	Active	HTSSOP16	Industrial	Ecopack2

(**) 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.