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Overview
| Topology | Buck Converter |
| Input voltage | 5.5-48 V |
| Switching frequency | 600-1000 kHz |
| IC revision | 2 |
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
- Factory automation
- Printers
- High current LED drivers
- DC-DC modules
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 1 µH, 16.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1 µH | Performance Rated Current16.8 A | Saturation Current @ 10%8 A | Saturation Current @ 30%19 A | DC Resistance4.6 mΩ | Self Resonant Frequency85 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 1.5 µH, 13.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.5 µH | Performance Rated Current13.8 A | Saturation Current @ 10%4.5 A | Saturation Current @ 30%14 A | DC Resistance6.6 mΩ | Self Resonant Frequency72 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2.2 µH, 10.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.2 µH | Performance Rated Current10.2 A | Saturation Current @ 10%5.6 A | Saturation Current @ 30%13 A | DC Resistance11.4 mΩ | Self Resonant Frequency52 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 3.3 µH, 8.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.3 µH | Performance Rated Current8.1 A | Saturation Current @ 10%4.5 A | Saturation Current @ 30%11 A | DC Resistance17.2 mΩ | Self Resonant Frequency43 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.7 µH, 7.8 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.7 µH | Performance Rated Current7.8 A | Saturation Current @ 10%2.5 A | Saturation Current @ 30%7 A | DC Resistance19.5 mΩ | Self Resonant Frequency33 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.9 µH, 8.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.9 µH | Performance Rated Current8.3 A | Saturation Current @ 10%2.2 A | Saturation Current @ 30%6.5 A | DC Resistance14.5 mΩ | Self Resonant Frequency56 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 6.5 µH, 6.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance6.5 µH | Performance Rated Current6.6 A | Saturation Current @ 10%2 A | Saturation Current @ 30%6 A | DC Resistance21.5 mΩ | Self Resonant Frequency50 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 7.6 µH, 5.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance7.6 µH | Performance Rated Current5.5 A | Saturation Current @ 10%2.2 A | Saturation Current @ 30%4.8 A | DC Resistance28.2 mΩ | Self Resonant Frequency48 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 8.5 µH, 5.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance8.5 µH | Performance Rated Current5.3 A | Saturation Current @ 10%2 A | Saturation Current @ 30%4.5 A | DC Resistance30.5 mΩ | Self Resonant Frequency44 MHz | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 10 µH, 5.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance10 µH | Performance Rated Current5.3 A | Saturation Current @ 10%1.8 A | Saturation Current @ 30%4 A | DC Resistance33 mΩ | Self Resonant Frequency40 MHz | MaterialSuperflux |