Key facts
- Brand
- STMicroelectronics
- Model
- ST1S03A
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2012-08-10
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STMicroelectronics ST1S03A Step-Down Switching Regulator Datasheet
The ST1S03A is a step-down current mode PWM DC-DC converter optimized for powering low-voltage digital cores in HDD applications. It features an internal 1.5A power switch and operates at a typical switching frequency of 1.5 MHz, allowing for the use of small surface-mount components. The device includes internal soft start, thermal protection, and cycle-by-cycle current limiting to prevent damage from short circuits.
Read onlineSTMicroelectronics ST1S03A specifications
| Output current | 1.5 A |
|---|---|
| Switching frequency | 1.5 MHz |
| Input voltage range | 3 V to 5.5 V |
| Quiescent current | 1.5 mA |
| Switch voltage drop | 200 mV |
| Package | DFN6D (3x3 mm) |
| Feedback voltage | 800 mV |
Source: STMicroelectronics ST1S03A Step-Down Switching Regulator Datasheet
All STMicroelectronics ST1S03A documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the maximum output current of the ST1S03A?
The ST1S03A provides up to 1.5 A of output current.
From: STMicroelectronics ST1S03A Step-Down Switching Regulator Datasheet
What is the typical switching frequency?
The device operates at a typical switching frequency of 1.5 MHz.
From: STMicroelectronics ST1S03A Step-Down Switching Regulator Datasheet
What is the output current capability of this demonstration board?
The board provides an output current capability of 1.5 A.
What happens to the switching frequency when the load is light?
The regulator automatically reduces the switching frequency when the output load becomes less than 250 mA typically.
What is the basis for the STEVAL-ISA047V2 demonstration board?
The demonstration board is based on the ST1S03A, an adjustable current mode PWM step-down DC-DC converter.
Does the regulator reduce switching frequency under light loads?
Yes, the regulator reduces the switching frequency automatically when the output load becomes less than 250 mA typically.