Product overview
Description
The ST1S09 is a step-down DC-DC converter optimized for powering low output voltage applications. It supplies a current in excess of 2 A over an input voltage range from 2.7 V to 6 V.
A high PWM switching frequency (1.5 MHz) allows the use of tiny surface-mount components.
Moreover, since the required synchronous rectifier is integrated, the number of the external components is reduced to minimum: a resistor divider, an inductor and two capacitors. The Power Good function continuously monitors the output voltage. An open drain Power Good flag is released when the output voltage is within regulation. In addition, 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 output current limited to prevent damages due to accidental short circuit. The ST1S09 is available in the DFN6 (3 x 3 mm) package.
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All features
- Operating junction temp. -30 °C to 125 °C
- Utilizes tiny capacitors and inductors
- Available in DFN6 (3 x 3 mm) exposed pad
- Non switching quiescent current: (typ) 1.5 mA over temperature range
- Integrated output over-voltage protection
- 1.5 MHz fixed frequency PWM with current control mode
- Typical efficiency: > 90%
- 2 A output current capability
- Two versions available: power good or inhibit
- RDSON (typ) 100 mΩ
- 2 % DC output voltage tolerance
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STMicroelectronics - ST1S09
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Longevity Commitment | Longevity Starting Date | Material Declaration** |
|---|---|---|---|---|---|---|---|
| ST1S09IPUR | Active Product is in volume production. | DFN6 3x3 | Industrial | Ecopack2 | - | - | |
| ST1S09PUR | Active Product is in volume production. | DFN6 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 | 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 | |||||||||||||
| ST1S09IPUR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
| ST1S09PUR | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
ST1S09IPUR Active
ST1S09PUR 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