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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 current4.0 V to 18 V input voltageOutput voltage adjustable from 0.8 V850 kHz switching frequencyInternal soft-startIntegrated 95 mΩ and 69 mΩ Power MOSFETsAll ceramic capacitorEnableCycle-by-cycle current limitingCurrent fold back short-circuit protectionVFQFPN4x4-8L, HSOP-8, and SO-8 and packages
Typical applications
- Power supplies and converters
- Connectivity
- Industrial tools, motor drives and equipment, Home building and city automation, Home and professional appliances, energy generation and distribution
- Electronics and robotics toys, gaming and XR accessories, home entertainment
- Lighting and Controls
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744313330 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 3.3 | – | – | 30 | SMT | 16.3 | 8.91 | 1335 | SMT | 5.5 | 14 | 8.1 | Superflux | ||
| 7443551370 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 3.7 | – | – | 26 | SMT | 18.3 | 5.39 | 1365 | SMT | 7 | 16 | 4.9 | WE-PERM | ||
 | 744071039 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TPC SMT Tiny Power Inductor | 3.9 | 4.9 | 4.5 | 40 | SMT | – | 17 | 8043 | SMT | – | – | – | – | ||
| 7443551470 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 4.7 | – | – | 30 | SMT | 14.9 | 7.59 | 1365 | SMT | 6 | 15 | 7 | WE-PERM | ||
 | 744066005 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TPC SMT Tiny Power Inductor | 5 | 5.3 | 5.5 | 30 | SMT | – | 22 | 1038 | SMT | – | – | – | – | ||
 | 74477110 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-PD SMT Power Inductor | 10 | 5 | 5.5 | 21.5 | SMT | 7.7 | 24 | 1260 | Standard | 5.5 | 7.2 | – | – | ||
| 7447707100 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-PD SMT Power Inductor | 10 | 5.6 | 11 | 15.1 | SMT | 8 | 21 | 1280 | Performance | 11 | 11 | – | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 744313330 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 7443551370 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 744071039 | SPEC | |
| 7443551470 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 744066005 | SPEC | |
| 74477110 | SPEC | |
| 7447707100 | SPEC |
| Samples |
|---|
| 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 |
|---|