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Overview
| Topology | Buck Converter |
| Input voltage | 4-18 V |
| Output 1 | 18 V / 3 A |
| IC revision | 7.0 |
Description
The ST1S40 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator. ST1S40 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.The ST1S40 integrates a 95 mΩ high side switch and 69 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 ST1S40 is available in VFQFPN 4 mm x 4 mm 8 lead package, HSOP-8 and standard SO-8 package.
Features
- 3 A DC output current
- 4.0 V to 18 V input voltage
- Output voltage adjustable from 0.8 V
- 850 kHz switching frequency
- Internal soft-start
- Integrated 95 mΩ and 69 mΩ Power MOSFETs
- All ceramic capacitor
- Enable
- Cycle-by-cycle current limiting
- Current fold back short-circuit protection
- Available in HSOP-8, VFQFPN4x4-8L, and SO8 packages
Typical applications
- mP/ASIC/DSP/FPGA core and I/O supplies
- Audio/graphic cards, Optical storage, hard disk drive, printers, Point of load for: STB, TVs, DVD
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT(A) | fres(MHz) | Mount | IRP,40K(A) | RDC max.(mΩ) | Size | Version | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | Material | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 3.3 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.3 µH | – | – | Self Resonant Frequency30 MHz | MountSMT | Performance Rated Current16.3 A | DC Resistance8.91 mΩ | Size1335 | VersionSMT | Saturation Current @ 10%5.5 A | Saturation Current @ 30%14 A | DC Resistance8.1 mΩ | MaterialSuperflux | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 3.7 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance3.7 µH | – | – | Self Resonant Frequency26 MHz | MountSMT | Performance Rated Current18.3 A | DC Resistance5.39 mΩ | Size1365 | VersionSMT | Saturation Current @ 10%7 A | Saturation Current @ 30%16 A | DC Resistance4.9 mΩ | MaterialWE-PERM | ||||
 | WE-TPC SMT Tiny Power Inductor, 3.9 µH, 4.9 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.9 µH | Rated Current4.9 A | Saturation Current4.5 A | Self Resonant Frequency40 MHz | MountSMT | – | DC Resistance17 mΩ | Size8043 | VersionSMT | – | – | – | – | ||||
| WE-HCI SMT Flat Wire High Current Inductor, 4.7 µH, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.7 µH | – | – | Self Resonant Frequency30 MHz | MountSMT | Performance Rated Current14.9 A | DC Resistance7.59 mΩ | Size1365 | VersionSMT | Saturation Current @ 10%6 A | Saturation Current @ 30%15 A | DC Resistance7 mΩ | MaterialWE-PERM | ||||
 | WE-TPC SMT Tiny Power Inductor, 5 µH, 5.3 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance5 µH | Rated Current5.3 A | Saturation Current5.5 A | Self Resonant Frequency30 MHz | MountSMT | – | DC Resistance22 mΩ | Size1038 | VersionSMT | – | – | – | – | ||||
 | WE-PD SMT Power Inductor, 10 µH, 5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance10 µH | Rated Current5 A | Saturation Current5.5 A | Self Resonant Frequency21.5 MHz | MountSMT | Performance Rated Current7.7 A | DC Resistance24 mΩ | Size1260 | VersionStandard | Saturation Current @ 10%5.5 A | Saturation Current @ 30%7.2 A | – | – | ||||
| WE-PD SMT Power Inductor, 10 µH, 5.6 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance10 µH | Rated Current5.6 A | Saturation Current11 A | Self Resonant Frequency15.1 MHz | MountSMT | Performance Rated Current8 A | DC Resistance21 mΩ | Size1280 | VersionPerformance | Saturation Current @ 10%11 A | Saturation Current @ 30%11 A | – | – |