ChipApex | Global Electronic Components Supplier
SEARCH
Search Product
Search Post
— IC芯片 | 连接器 | 传感器 | 被动器件 —
Consult the customer manager about the wholesale price.
consultation hotline：86-132-6715-2157
email：[email protected]
Contact the product manager for consultation. One-stop consultation is available.
Do you want a lower wholesale price? Please send us your inquiry and we will reply immediately.
Product Detailed Parameters
- Description：IC REG BUCK ADJ 3A 8VFDFPN
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：2.8V
- Voltage - Input (Max)：4V
- Voltage - Output (Min/Fixed)：0.8V
- Voltage - Output (Max)：4V
- Current - Output：3A
- Frequency - Switching：1.5MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 150°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：8-VDFN Exposed Pad
- Supplier Device Package：8-VFDFPN (3x3)
- Grade：-
- Qualification：-
Download product information
Overview
The AST1S31PUR is an internally compensated, fixed-frequency PWM synchronous step-down regulator designed for automotive applications. It operates from a 2.8 V to 4 V input range and regulates output voltages as low as 0.8 V up to VIN. The device integrates a 70 mΩ high-side switch and a 55 mΩ synchronous rectifier to ensure high efficiency with very low output voltages. Featuring peak current mode control with internal compensation, it supports a 1.5 MHz switching frequency and delivers a 3 A DC output current. The component includes internal soft-start, enable functionality, Power Good (POR), cycle-by-cycle current limiting, and current foldback short-circuit protection. It is available in a 3 x 3 mm, 8-lead VFDFPN package and holds AEC-Q100 qualification.
Feature Summary
- Internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator
- Integrated 70 mΩ high-side switch and 55 mΩ synchronous rectifier for high efficiency
- AEC-Q100 qualified for automotive reliability standards
- Includes internal soft-start, enable, Power Good, and comprehensive protection features
Applications
- Automotive power distribution systems
- Low voltage rail regulation in vehicle electronics
- Power supply stages for automotive microcontrollers and sensors
Procurement Notes
Verify the specific suffix PUR against official STMicroelectronics documentation to confirm package type and tape-and-reel specifications. Ensure the procurement channel provides valid AEC-Q100 certification evidence. Confirm that the ordering part number matches the exact electrical characteristics required for the target automotive application design.
Selection Notes
Select this component when designing for automotive environments requiring a compact, high-efficiency buck converter with inputs between 2.8 V and 4 V. The integrated power MOSFETs and internal compensation simplify the design by minimizing external component count. Consider the 3 A output capability and 1.5 MHz frequency for balancing size and performance in space-constrained automotive modules.
Part Context
The AST1S31 belongs to STMicroelectronics' portfolio of monolithic buck converters and step-down switching regulators. This series targets high-reliability automotive and industrial applications, offering robust performance under demanding conditions. The device complements other power management solutions by providing a fully integrated synchronous rectification solution within a small footprint.
Replacement Considerations
Consult official STMicroelectronics substitution guides for verified alternative part numbers. Do not assume cross-compatibility with non-automotive grade regulators or devices lacking AEC-Q100 qualification without rigorous validation.
