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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
- Connectivity
- Power supplies and converters
- 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 | 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 | 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 | 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 | |
| 7443551370 | SPEC | |
| 744071039 | SPEC | |
| 7443551470 | SPEC | |
| 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 |
|---|
