Technical Specifications
Parameters and characteristics commom to parts in this series
| Specification | AST1S31PUR | AST1S31 Series |
|---|---|---|
| - | - | |
| Current - Output | 3 A | 3 A |
| Frequency - Switching | 1.5 MHz | 1.5 MHz |
| Function | Step-Down | Step-Down |
| Mounting Type | Surface Mount | Surface Mount |
| Number of Outputs | 1 | 1 |
| Operating Temperature [Max] | 150 °C | 150 °C |
| Operating Temperature [Min] | -40 °C | -40 °C |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable | Adjustable |
| Package / Case | 8-VDFN Exposed Pad | 8-VDFN Exposed Pad |
| Supplier Device Package | 8-VFDFPN (3x3) | 8-VFDFPN (3x3) |
| Synchronous Rectifier | True | True |
| Topology | Buck | Buck |
| Voltage - Input (Max) | 4 V | 4 V |
| Voltage - Input (Min) [Min] | 2.8 V | 2.8 V |
| Voltage - Output (Max) [Max] | 4 V | 4 V |
| Voltage - Output (Min/Fixed) | 0.8 V | 0.8 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tape & Reel (TR) | 3000 | $ 1.90 | |
AST1S31 Series
Up to 4 V, 3 A step-down 1.5 MHz switching regulator for automotive applications
| Part | Synchronous Rectifier | Function | Output Configuration | Voltage - Output (Max) [Max] | Voltage - Input (Min) [Min] | Number of Outputs | Voltage - Output (Min/Fixed) | Mounting Type | Operating Temperature [Max] | Operating Temperature [Min] | Frequency - Switching | Current - Output | Supplier Device Package | Output Type | Topology | Package / Case | Voltage - Input (Max) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
STMicroelectronics AST1S31PUR | Step-Down | Positive | 4 V | 2.8 V | 1 | 0.8 V | Surface Mount | 150 °C | -40 °C | 1.5 MHz | 3 A | 8-VFDFPN (3x3) | Adjustable | Buck | 8-VDFN Exposed Pad | 4 V | |
STMicroelectronics AST1S31PUR |
Description
General part information
AST1S31 Series
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.
Documents
Technical documentation and resources