L7987 datasheet(1/37 Pages) STMICROELECTRONICS

Part #	L7987

Description	Adjustable current limitation

PDF	37 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 37 page

This is information on a product in full production.

March 2015

DocID025589 Rev 3

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L7987

61 V 3 A asynchronous step-down switching regulator with

adjustable current limitation

Datasheet

- production data

Features

 3 A DC output current

 4.5 V to 61 V operating input voltage

 RDS,ON = 250 m typ.

 Adjustable fSW (250 kHz - 1.5 MHz)

 Low IQ-SHD (11 µA typ. from VIN)

 Low IQ (1 mA typ. - VIN 24 V - VOUT 3.3 V)

 Output voltage adjustable from 0.8 V to VIN

 Synchronization

 Adjustable soft-start time

 Adjustable current limitation

 Low dropout operation (12 µs max.)

 VBIAS improves 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

Applications

 Designed for 24 V bus

 Fail safe tolerant system

 Programmable logic controllers (PLCs)

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 VIN. 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 VBIAS pin

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.

HTSSOP16 (RTH = 40 °C/W)

www.st.com

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