ST1S14PHR Datasheet, PDF (1/46 Pages) STMicroelectronics – Up to 3 A step-down switching regulator

ST1S14
Up to 3 A step-down switching regulator
Datasheet - production data
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Applications
• Factory automation
• Printers
• DC-DC modules
• High current LED drivers
Features
• 3 A DC output current
• Operating input voltage from 5.5 V to 48 V
• 850 kHz internally fixed switching frequency
• Internal soft-start
• Power good open collector output
• Current mode architecture
• Embedded compensation network
• Zero load current operation
• Internal current limiting
• Inhibit for zero current consumption
• 2 mA maximum quiescent current over
temperature range
• 250 mΩ typ. R_DS(on)
• Thermal shutdown
Description
The ST1S14 is a step-down monolithic power
switching regulator able to deliver up to 3 A DC
current to the load depending on the application
conditions. The high current level is also achieved
thanks to a HSOP8 package with exposed frame,
that allows to reduce the R_th(JA) down to
approximately 40 °C/W. The output voltage can
be set from 1.22 V. The device uses an internal N-
channel DMOS transistor (with a typical R_DS(on) of
200 mΩ) as the switching element to minimize the
size of the external components. The internal
oscillator fixes the switching frequency at 850
kHz. Power good open collector output validates
the regulated output voltage as soon as it reaches
the regulation. Pulse-by-pulse current limit offers
an effective constant current short-circuit
protection. Current foldback decreases overstress
in a persistent short-circuit condition.
Figure 1. Application schematic
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March 2013
This is information on a product in full production.
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