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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 | 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744770015 | SPEC | 8 files | WE-PD SMT Power Inductor | 1.5 | 19 | 19 | 5 | – | 1280 | Standard | – | – | – | – | ||
 | 744310150 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 1.5 | 9.6 | – | 13.97 | 80 | 7030 | SMT | 4.75 | 12 | 12.7 | Superflux | ||
| 744310200 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 2 | 8.7 | – | 15.62 | 58 | 7030 | SMT | 3 | 9 | 14.2 | Superflux | ||
| 74477002 | SPEC | 8 files | WE-PD SMT Power Inductor | 2.4 | 13.5 | 15 | 9 | – | 1280 | Standard | – | – | – | – | ||
| 74477003 | SPEC | 8 files | WE-PD SMT Power Inductor | 3.5 | 12 | 12.5 | 11 | – | 1280 | Standard | – | – | – | – |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | 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 |
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