L7987L datasheet(1/41 Pages) STMICROELECTRONICS

Part #	L7987L

Description	Adjustable current limitation

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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This is information on a product in full production.

January 2016

DocID026362 Rev 3

1/41

L7987L

61 V, 2 A asynchronous step-down switching regulator with

adjustable current limitation

Datasheet

- production data

Features

 2 A DC output current

 4.5 V to 61 V operating input voltage

 RDS,ON = 300 mΩ 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

 Advanced bootstrap capacitor management for

LDO operation

 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 systems

 Programmable logic controllers (PLCs)

Description

The L7987L device is a step-down monolithic

switching regulator able to deliver up to 2 A DC.

The output voltage adjustability ranges from 0.8 V

to almost VIN. 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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