S09 DC-DC 3.3V 600mA Buck Boost Converter Step Up Down Power Module 2.5-15V

🔧 S09 DC-DC 3.3V Buck Boost Converter Module | AuscomTech

The S09 is a compact automatic DC-DC buck-boost converter designed to provide a regulated 3.3V output from a variable 2.5V–15V DC input. It automatically steps voltage up or down, making it suitable for battery-powered electronics, microcontroller circuits and embedded systems.

With a maximum rated output current of 600mA, quiescent current below 200µA and a 1.2MHz switching frequency, this module provides efficient voltage regulation in a compact 19 × 14mm PCB format.

A dedicated enable (EN) input allows continuous operation or external electronic shutdown, making it useful for portable electronics, sensor systems and power-managed projects.

⭐ Key Features

• Automatic Step-Up / Step-Down: Maintains a regulated output when the input voltage is above or below 3.3V.
• Wide Input Range: Accepts 2.5V–15V DC.
• 600mA Maximum Output: Supports compatible low-power electronic loads.
• Low Quiescent Current: Less than 200µA for battery-operated applications.
• Enable / Shutdown Control: Dedicated EN terminal for external power switching.
• High Switching Frequency: 1.2MHz operation.
• Fixed Voltage Regulation: Nominal 3.3V output without adjustment.
• Compact Construction: 19 × 14 × 4.2mm module dimensions.
• Flexible Installation: Solder pads suitable for direct wiring or 2.54mm pin connections.
• Wide Temperature Range: Specified operation from -20°C to +85°C.

📊 Technical Specifications

• Model: S09
• Converter Type: Non-isolated DC-DC Buck-Boost
• Input Voltage: 2.5V–15V DC
• Output Voltage: 3.3V DC fixed
• Maximum Rated Output Current: 600mA
• Conversion Efficiency: 75% (supplier specified)
• Quiescent Current: Less than 200µA
• Output Ripple: Less than 50mV (specified)
• Output Accuracy: ±0.1V
• Switching Frequency: 1.2MHz / 1200kHz
• Control Input: EN (enable / shutdown)
• Enable High Level: 3V–15V recommended
• Shutdown State: EN low or floating
• Operating Temperature: -20°C to +85°C
• Relative Humidity: 20–90%
• Dimensions: 19 × 14 × 4.2mm
• PCB Layers: 2
• Installation: SMD or 2.54mm pin connection
• Cooling: Natural convection

🔌 Pin Definitions & Wiring

• VOUT-: Negative output terminal.
• VOUT+: Positive regulated output terminal.
• EN: Module enable / shutdown control input.
• VIN+: Positive DC input terminal.
• VIN-: Negative DC input terminal.

Continuous Operation: Connect EN to VIN+ to enable the converter whenever input power is applied.

External Control: Drive EN high to activate the module. Pull EN low or leave floating to disable operation.

The supplied documentation lists an EN high level of 2V–15V in the pin definition and 3V–15V in the connection diagram. A control-high voltage of 3V–15V is the conservative operating choice.

🧩 Typical Applications

• Battery-powered 3.3V electronic circuits
• Arduino and ESP32-compatible sensor peripherals
• Microcontroller voltage regulation
• Portable wireless and communication devices
• DIY electronics and prototyping
• Embedded control systems
• Robotics and model electronics
• Remote monitoring and data collection
• Industrial sensor circuits
• Compact regulated DC power supplies

⚠️ Important Notes

• Fixed Output: This listing is specifically for the 3.3V version. Output voltage is not adjustable.
• Maximum Current: 600mA is the rated maximum. Available output current depends on input voltage, source capability and operating conditions.
• Input Limits: Use DC power within 2.5V–15V. Do not exceed the rated input voltage.
• EN Connection: The enable terminal must be driven high for operation. Connect EN to VIN+ for continuous operation.
• Microcontroller Power: Check the complete circuit’s peak current requirements before powering development boards, especially wireless devices with high transmission current peaks.
• Non-Isolated: Input and output do not provide galvanic isolation.
• Connection Polarity: Verify all terminals before applying power.
• Electrical Performance: Conversion efficiency, ripple and load capacity vary with operating conditions.
• Installation: Soldering may be required. Headers and connecting wires are not included.

📦 Package Includes

• 1 × S09 DC-DC Buck Boost Converter Power Module – Fixed 3.3V, 600mA

🔗 Recommended Accessories (Not Included)

• 2.54mm Male Pin Headers – For PCB and prototype mounting.
• Hook-Up Wire – For connecting input power and output loads.
• Prototype PCB / Perfboard – For custom electronic circuit assembly.
• Battery Holder or DC Power Supply – For providing compatible input power.