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STMicroelectronics ST1S14

Up to 3 A step-down switching regulator

Overview

TopologyBuck Converter
Input voltage5.5-48 V
Switching frequency600-1000 kHz
IC revision2

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 applicationconditions. The high current level is also achieved thanks to a HSOP8 package with exposed frame, that allows to reduce the Rth(JA) down toapproximately 40 °C/W. The output voltage can be set from 1.22 V. The device uses an internal Nchannel DMOS transistor (with a typical RDS(on) of200 mΩ) as the switching element to minimize the size of the external components. The internal oscillator fixes the switching frequency at 850kHz. 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.

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. RDS(on)
  • Thermal shutdown

Remarks:Table 10. Inductor selectionRefer page no.24

Typical applications

  • High current LED drivers
  • Factory automation
  • Printers
  • DC-DC modules

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
LR
(µH)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
MaterialVersion Samples
744311100
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 1 15 0.78 19 4.6 85 Superflux SMT
744311150
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 1.5 11 1.12 14 6.6 72 Superflux SMT
744311220
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 2.2 9 1.75 13 11.4 52 Superflux SMT
744311330
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 3.3 6.5 2.75 11 17.2 43 Superflux SMT
744311470
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 4.7 6 3.5 7 19.5 33 Superflux SMT
744314490
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 4.9 6.5 3.4 6.5 14.5 56 Superflux SMT
744314650
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 6.5 6 4.5 6 21.5 50 Superflux SMT
744314760
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 7.6 4.2 6 4.8 28.2 48 Superflux SMT
744314850
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 8.5 4 6.8 4.5 30.5 44 Superflux SMT
744314101
STE ALT EAG CAD LTS PSP SPE IGS CADWE-HCI SMT Flat Wire High Current Inductor 10 3.5 7.5 4 33 40 Superflux SMT
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
LR
(µH)
ISAT
(A)
RDC
(mΩ)
fres
(MHz)
MaterialVersion Samples