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The ST1S50 device is a 500 kHz fixed frequency PWM synchronous step-down regulator. The ST1S50 operates from 4.0 V to 18 V input, while it regulates an output voltage as low as 0.8 V and up to 0.88 x VIN.
The ST1S50 device integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.
The peak current mode control with a special PFM mode enables high efficiency at a light load.
The ST1S50 device is available in a VFDFPN10 3 x 3 x 1 mm - 10 leads package.Key Features
- 4 A output current
- 4.0 V to 18 V input voltage
- Output voltage adjustable from 0.8 V to 0.88 x VIN
- 500 kHz switching frequency
- High efficiency at light load
- Programmable soft-start and enable
- Integrated 95 mΩ and 69 mΩ power MOSFETs
- All ceramic capacitor
- Power Good
- Cycle-by-cycle current limiting
- Short-circuit protection
- VFDFPN10 3 x 3 x 1 mm - 10 L
Featured Videos
Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISA146V1 -- 4 A step-down switching evaluation board based on the ST1S50 Part Number4 A step-down switching evaluation board based on the ST1S50
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ST1S50PUR | Active | DFN10 3X3 | 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 | |
|---|---|---|---|---|---|---|---|---|---|
| ST1S50PUR | 7 distributors | Get sample | DFN10 3X3 | Tape And Reel | Active | EAR99 | CHINA | 0.788 / 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
