L7987 - 61 V 3 A asynchronous step-down switching regulator with adjustable current limitation - STMicroelectronics

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Product overview

Description

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.

All 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
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	Resource title	Version	Latest update

SPICE models (1)

	Resource title	Version	Latest update
ZIP	L7987 Pspice model	1.0	02 Nov 2017	02 Nov 2017 L7987 Pspice model 1.0

SIMPLIS models (1)

	Resource title	Version	Latest update
ZIP	L7987 SIMPLIS examples schematics	2024.06	12 Jun 2024	12 Jun 2024 L7987 SIMPLIS examples schematics 2024.06

Quality and Reliability

Part Number	Marketing Status	Package	Grade	RoHS Compliance Grade	Longevity Commitment	Longevity Starting Date	Material Declaration**
L7987	Active	HTSSOP16	Industrial	Ecopack2	10	2023-06-06T00:00:00.000+02:00	PDF XML
L7987TR	Active	HTSSOP16	Industrial	Ecopack2	10	2023-06-06T00:00:00.000+02:00	PDF XML

L7987

Package:

HTSSOP16

Material Declaration**:

L7987TR

Package:

HTSSOP16

Material Declaration**:

(**) 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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