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STMicroelectronics AST1S31
Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications
Overview
| Topology | Buck Converter |
| Input voltage | 2.8-4 V |
| Switching frequency | 1200-1900 kHz |
| Output 1 | 3.3 V / 3 A |
| IC revision | 5 |
Description
The AST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The AST1S31 device operates from 2.8 V to 4 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.The AST1S31 integrates a 70 mΩ high-side switch and a 55 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.The peak current mode control with an internal compensation deliver a very compact solution with a minimum component count.The AST1S31 device is available in a 3 x 3 mm, 8 leads VFDFPN package.
Features
- AECQ100 qualification
- 3 A DC output current
- 2.8 V to 4 V input voltage
- Output voltage adjustable from 0.8 V
- 1.5 MHz switching frequency
- Internal soft-start and enable
- Integrated 70 mΩ and 55 mΩ power MOSFETs
- All ceramic capacitor
- Power Good (POR)
- Cycle-by-cycle current limiting
- Current foldback short-circuit protection
- VFDFPN 3 x 3 - 8L package
Typical applications
- Battery powered applications
- Designed for automotive systems / Car body applications
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | RDC max.(mΩ) | fres(MHz) | Size | Version | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | Material | IR,40K(A) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-PD SMT Power Inductor, 1.5 µH, 19 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance1.5 µH | Performance Rated Current19 A | DC Resistance5 mΩ | Self Resonant Frequency42 MHz | Size1280 | VersionStandard | Saturation Current @ 10%19 A | Saturation Current @ 30%24.5 A | – | – | Rated Current16.5 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, 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, 2.4 µH, 13.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance2.4 µH | Performance Rated Current13.5 A | DC Resistance9 mΩ | Self Resonant Frequency41 MHz | Size1280 | VersionStandard | Saturation Current @ 10%15 A | Saturation Current @ 30%19.5 A | – | – | Rated Current11.5 A | ||||
| WE-PD SMT Power Inductor, 3.5 µH, 12 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PD SMT Power Inductor | Inductance3.5 µH | Performance Rated Current12 A | DC Resistance11 mΩ | Self Resonant Frequency37.5 MHz | Size1280 | VersionStandard | Saturation Current @ 10%12.5 A | Saturation Current @ 30%16.2 A | – | – | Rated Current10.2 A |