This demonstration board is based on the ST1S12 family of synchronous step-down DC-DC converters optimized for powering low-voltage digital cores in HDD (hard disk drive) applications, and is generally used to replace high-current linear solutions when power dissipation may cause high heating of the application environment.
It provides up to 0.7 A over an input voltage range of 2.5 V to 5.5 V. A high switching frequency of 1.7 MHz allows the use of tiny surface-mount components. A resistor divider to set the output voltage value, an inductor, and two capacitors are required for the adjustable version, while only an inductor and 2 capacitors are needed for the 1.2 V and 1.8 V fixed version.
A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors.
The ST1S12 device is thermal protected and current limited to prevent damage due to accidental short-circuit. This family of products is available in the TSOT23-5L package.
- RDS(on) typ. 250 m
and 400 m
- Non switching quiescent current: max 600 μA over temperature range
- Uses tiny capacitors and inductors
- Internal soft-start
- Enable function
- Step-down current mode PWM (1.7 MHz) DCDC converter
- 0.7 A output current capability
- Fixed output voltage 3.3 V
- Synchronous rectification
- Typical efficiency: > 90%
- 3% DC output voltage tolerance
- RDS(on) typ. 250 m
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Quality and Reliability
|Part Number||Marketing Status||Package||Grade||RoHS Compliance Grade||WEEE Compliant||Material Declaration**|
RoHS Compliance Grade
(**) 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.
Sample & Buy
|Part Number||Order from Distributors||Order from ST||Core Product||Marketing Status||ECCN (US)||Country of Origin||Board production status||Budgetary Price (US$)*/Qty|
|STEVAL-ISA055V2|| 2 distributors |
Distributor availability ofSTEVAL-ISA055V2
Distributor reported inventory date: 2020-07-08
|Buy now||ST1S12GR|| |
|EAR99||ITALY||-||46.0 / 1|
Budgetary Price (US$)* / Qty
46.0 / 1
Country of Origin
Board production status