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The ST1S31 device is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator. The ST1S31 operates from 2.8 V to 5.5 V input, while it regulates an output voltage as low as 0.8 V and up to VIN.
The ST1S31 integrates a 60 mΩ high-side switch and a 45 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.
The peak current mode control with internal compensation delivers a very compact solution with a minimum component count.
The ST1S31 device is available in 3 mm x 3 mm, 8 lead VFDFPN and SO8 packages.Key Features
- 3 A DC output current
- 2.8 V to 5.5 V input voltage
- Output voltage adjustable from 0.8 V
- 1.5 MHz switching frequency
- Internal soft-start and enable
- Integrated 60 mΩ and 45 mΩ power MOSFETs
- All ceramic capacitor
- Power Good (POR)
- Cycle-by-cycle current limiting
- Current foldback short-circuit protection
- VFDFPN 3 x 3 - 8L, SO8 packages
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Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISA069V1 -- 3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package 
STEVAL-ISA070V1 -- 3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in SO-8 package Part Number3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in DFN 3x3 package
3 A / 1.5 MHz step-down synchronous switching regulator based on the ST1S31 in SO-8 package
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ST1S31D-R | NRND | SO-8 | Industrial | Ecopack2 | |
| ST1S31PUR | Active | VFDFPN 8 3x3x1.0 | Industrial | Ecopack2 |
(**) 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.
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Sample & Buy
| Part Number | Order from Distributors | Order from ST | Package | Packing Type | Marketing Status | ECCN (US) | Country of Origin | Budgetary Price (US$)*/Qty | |
|---|---|---|---|---|---|---|---|---|---|
| ST1S31D-R | 2 distributors | Buy now | SO-8 | Tape And Reel | NRND | EAR99 | CHINA | 0.471 / 1k | |
| ST1S31PUR | 4 distributors | Get sample | VFDFPN 8 3x3x1.0 | Tape And Reel | Active | EAR99 | MALAYSIA | 0.535 / 1k |
(*) 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
