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The AST1S31HF is an internally compensated 2.3 MHz fixed frequency PWM synchronous step-down regulator. The AST1S31HF 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 AST1S31HF device 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 internal compensation deliver a very compact solution with a minimum component count.
The AST1S31HF is available in a 3 mm x 3 mm, 8-lead VFDFPN package.Key Features
- AECQ100 qualified
- 3 A DC output current
- 2.8 V to 4 V input voltage
- Output voltage adjustable from 0.8 V
- 2.3 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
Sample & Buy
| Part Number | Package | Packing Type | Marketing Status | Budgetary Price (US$)* | Quantity | ECCN (US) | Country of Origin | Order from Distributors | Order from ST |
|---|---|---|---|---|---|---|---|---|---|
| AST1S31HF | VFDFPN 8 3x3x1.0 | Tape And Reel |
Active
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1.258 | 10000 | EAR99 | MALAYSIA | No availability of distributors reported, please contact our sales office | Buy now |
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors
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Picture Part number Manufacturer Description 
STEVAL-ISA160V1 ST 3 A / 2.3 MHz step-down synchronous switching regulator based on the AST1S31HF in a DFN 3x3 package Part Number3 A / 2.3 MHz step-down synchronous switching regulator based on the AST1S31HF in a DFN 3x3 package
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| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| AST1S31HF |
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VFDFPN 8 3x3x1.0 | Automotive | Ecopack1 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
