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
eDesignSuite
eDesignSuite is a comprehensive set of easy-to-use design-aid utilities ready to help you streamline the system development process with a wide range of ST products.
Power Management Design Center
Power Supply Design Tool
SMPS design, by topology, by type and by product PFC design with analog and digitial control Supports various PCB configurations 
LED Lighting Design Tool
Handles AC-DC and DC-DC design in common topologies Displays interactive and annotated schematic Provides current/voltage graphs, Bode plots, efficiency curves and power-loss data 
Power Tree Designer
Specify input/output power for each node in the tree Check for consistency Design each individual node Start your design with the ST1S09 now
xwith our eDesignSuite online design aid utilities and simulation tools.
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STMicroelectronics - ST1S09
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ST1S09IPUR | Active | DFN6 3x3 | Industrial | Ecopack2 | |
| ST1S09PUR | Active | 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.
Sample & Buy
| Part Number | Order from distributors | Order from ST | Marketing Status | ECCN (US) | ECCN (EU) | Packing Type | Package | Temperature (°C) | Country of Origin | Budgetary Price (US$)*/Qty | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | |||||||||||
| ST1S09IPUR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | DFN6 3x3 | -30 | 125 | PHILIPPINES | | ||
| ST1S09PUR | distributors No availability of distributors reported, please contact our sales office | Active | EAR99 | NEC | Tape and Reel | DFN6 3x3 | -30 | 125 | PHILIPPINES | | ||
(*) 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