Product overview
Description
The ST1S12 is a step down DC-DC converter optimized for powering low-voltage digital cores in HDD applications and, generally, to replace the high current linear solution when the 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 (1.7 MHz) allows the use of tiny surface-mount components. In addition to the resistor divider to set the output voltage value, only an inductor and two capacitors are required. Moreover, a low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR SMD ceramic capacitors. The device is thermally protected and the current is limited to prevent damage due to accidental short-circuit. The ST1S12 is available in the TSOT23-5L package.
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All features
- Step-down current mode PWM (1.7 MHz) DC-DC converter
- 3% DC output voltage tolerance
- Synchronous rectification
- Fixed output voltage 1.2 V, 1.8 V, and ADJ (available on request 1.5 V, 2.5 V and 3.3 V)
- Enable function
- Internal soft start
- Typical efficiency: > 90%
- 0.7 A output current capability
- Not switching quiescent current: max 650 μA over temperature range
- RDSONtyp. 250 mΩ and 400 mΩ
- Uses tiny capacitors and inductors
- Operative junction temp. -40 °C to 125 °C
- Available in TSOT23-5L package
Circuit Diagram
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STMicroelectronics - ST1S12XX
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| ST1S12G12R | Active Product is in volume production. | TSOT23-5L | Industrial | Ecopack2 | - | - | |
| ST1S12G18R | Active Product is in volume production. | TSOT23-5L | Industrial | Ecopack2 | - | - | |
| ST1S12GR | Active Product is in volume production. | TSOT23-5L | 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 | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||||
| ST1S12G18R | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| ST1S12GR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| ST1S12G12R | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
ST1S12G18R Active
ST1S12GR Active
ST1S12G12R Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors