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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.Key Features
- 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
Sample & Buy
| Part Number | Core Product | Marketing Status | Budgetary Price (US$)* | Quantity | ECCN (US) | Country of Origin | Board production status | Order from Distributors | Order from ST |
|---|---|---|---|---|---|---|---|---|---|
| STEVAL-ISA055V2 | ST1S12GR |
Active
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46.0 | 1 | EAR99 | ITALY | - | Check Availability | 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
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | WEEE Compliant | Material Declaration** |
|---|---|---|---|---|---|---|
| STEVAL-ISA055V2 |
Active
|
CARD | Industrial | Ecopack2 | - |
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STEVAL-ISA055V2
Package:
CARDMaterial Declaration**:
(**) 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.
