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Overview
| Topology | Buck Converter |
| Switching frequency | 1200-1900 kHz |
| IC revision | 4 |
Description
The ST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous stepdown regulator. The ST1S31 operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to VIN. The ST1S31 integrates a 60 mΩ high-side switch and a 45 mΩ synchronous rectifier allowing very high efficiency with very low output voltages. The peak current mode control with internal compensation delivers a very compact solution with a minimum component count. The ST1S31 device is available in 3 mm x 3 mm, 8 lead VFDFPN and SO8 packages.
Features
- 3 A DC output current
- 2.8 V to 5.5 V input voltage
- Output voltage adjustable from 0.8 V
- 1.5 MHz switching frequency
- Internal soft-start and enable
- Integrated 60 m and 45 m power MOSFETs
- All ceramic capacitor
- Power Good (POR)
- Cycle-by-cycle current limiting
- Current foldback short-circuit protection
- VFDFPN 3 x 3 - 8L, SO8 packages
Typical applications
- μP/ASIC/DSP/FPGA core and I/O supplies, Optical storage, hard disk drive, printers, audio/graphic cards
- Point of load for: STB, TVs, DVDs
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT(A) | RDC max.(mΩ) | fres(MHz) | Size | Version | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD SMT Power Inductor, 1.5 µH, 17.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance1.5 µH | Performance Rated Current17.5 A | Saturation Current13.5 A | DC Resistance6 mΩ | Self Resonant Frequency60 MHz | Size1260 | VersionStandard | Saturation Current @ 10%13.5 A | Saturation Current @ 30%17.5 A | – | – | ||||
 | WE-HCI SMT Flat Wire High Current Inductor, 1.5 µH, 9.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance1.5 µH | Performance Rated Current9.6 A | – | DC Resistance13.97 mΩ | Self Resonant Frequency80 MHz | Size7030 | VersionSMT | Saturation Current @ 10%4.75 A | Saturation Current @ 30%12 A | DC Resistance12.7 mΩ | 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 | – | DC Resistance7.26 mΩ | Self Resonant Frequency72 MHz | Size7040 | VersionSMT | Saturation Current @ 10%4.5 A | Saturation Current @ 30%14 A | DC Resistance6.6 mΩ | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2 µH, 8.7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2 µH | Performance Rated Current8.7 A | – | DC Resistance15.62 mΩ | Self Resonant Frequency58 MHz | Size7030 | VersionSMT | Saturation Current @ 10%3 A | Saturation Current @ 30%9 A | DC Resistance14.2 mΩ | MaterialSuperflux | ||||
| WE-PD SMT Power Inductor, 2.2 µH, 15.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance2.2 µH | Performance Rated Current15.5 A | Saturation Current11 A | DC Resistance7 mΩ | Self Resonant Frequency50 MHz | Size1260 | VersionStandard | Saturation Current @ 10%11 A | Saturation Current @ 30%14.4 A | – | – | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2.2 µH, 9.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.2 µH | Performance Rated Current9.2 A | – | DC Resistance12.43 mΩ | Self Resonant Frequency108 MHz | Size5040 | VersionSMT | Saturation Current @ 10%3.5 A | Saturation Current @ 30%7.5 A | DC Resistance11.3 mΩ | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 2.8 µH, 22.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance2.8 µH | Performance Rated Current22.5 A | – | DC Resistance3.74 mΩ | Self Resonant Frequency35 MHz | Size1365 | VersionSMT | Saturation Current @ 10%8 A | Saturation Current @ 30%17.5 A | DC Resistance3.3 mΩ | MaterialWE-PERM | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 3.3 µH, 10.9 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.3 µH | Performance Rated Current10.9 A | – | DC Resistance9.9 mΩ | Self Resonant Frequency65 MHz | Size7050 | VersionSMT | Saturation Current @ 10%3.2 A | Saturation Current @ 30%8 A | DC Resistance9 mΩ | MaterialSuperflux | ||||
| WE-PD SMT Power Inductor, 3.5 µH, 14.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance3.5 µH | Performance Rated Current14.5 A | Saturation Current9.5 A | DC Resistance8 mΩ | Self Resonant Frequency40 MHz | Size1260 | VersionStandard | Saturation Current @ 10%9.5 A | Saturation Current @ 30%12.4 A | – | – | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 3.5 µH, 24.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.5 µH | Performance Rated Current24.2 A | – | DC Resistance3.348 mΩ | Self Resonant Frequency38 MHz | Size1890 | VersionSMT | Saturation Current @ 10%17 A | Saturation Current @ 30%37 A | DC Resistance3.1 mΩ | MaterialWE-PERM 2 | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.2 µH, 15.4 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.2 µH | Performance Rated Current15.4 A | – | DC Resistance7.87 mΩ | Self Resonant Frequency33 MHz | Size1050 | VersionSMT | Saturation Current @ 10%5 A | Saturation Current @ 30%14 A | DC Resistance7.1 mΩ | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.7 µH, 6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.7 µH | Performance Rated Current6 A | – | DC Resistance26.95 mΩ | Self Resonant Frequency57 MHz | Size5040 | VersionSMT | Saturation Current @ 10%2.5 A | Saturation Current @ 30%4.7 A | DC Resistance24.5 mΩ | 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 | – | DC Resistance21.45 mΩ | Self Resonant Frequency33 MHz | Size7040 | VersionSMT | Saturation Current @ 10%2.5 A | Saturation Current @ 30%7 A | DC Resistance19.5 mΩ | MaterialSuperflux |