L7987L Datasheet, PDF (1/41 Pages) STMicroelectronics – Adjustable current limitation

L7987L
61 V, 2 A asynchronous step-down switching regulator with
adjustable current limitation
Datasheet - production data
HTSSOP16 (R_TH = 40 °C/W)
Features
 2 A DC output current
 4.5 V to 61 V operating input voltage
 R_DS,ON = 300 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_IN 24 V - V_OUT 3.3 V)
 Output voltage adjustable from 0.8 V to V_IN
 Synchronization
 Adjustable soft-start time
 Adjustable current limitation
 Advanced bootstrap capacitor management for
LDO operation
 V_BIAS 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
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 V_IN. The embedded switchover feature
on the V_BIAS 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.
Applications
 Designed for 24 V bus
 Fail safe tolerant systems
 Programmable logic controllers (PLCs)
January 2016
This is information on a product in full production.
DocID026362 Rev 3
1/41
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