The S-1206B42-M3T1S is a CMOS step-up DC-DC converter from SII Semiconductor Corporation. It is specifically designed to provide a regulated 4.2V output voltage from a lower input voltage source. This converter is ideal for battery-powered applications and systems requiring a stable voltage boost with high efficiency and minimal space consumption. The SOT-23-6 package makes it suitable for compact designs.

Applications:

• Mobile phones and smartphones
• Bluetooth headsets
• Wearable devices (smart watches, fitness trackers)
• Portable medical devices
• Wireless sensors and IoT devices
• Rechargeable battery charging circuits

Features:

• Input Voltage Range: 0.9 V to 5.5 V
• Output Voltage: 4.2 V (Fixed)
• Oscillation Frequency: 1.2 MHz
• Efficiency: Up to 90%
• Supply Current: 6.0 μA (Typical)
• Start-up Voltage: 0.7 V (Typical)
• Package: SOT-23-6
• Protection Circuits: Overcurrent Protection (OCP)

Benefits:

• Extended Battery Life: High efficiency minimizes power consumption, extending the operational time of battery-powered devices.
• Stable Output Voltage: Ensures a consistent 4.2V output, critical for the reliable operation of connected components, such as battery charging circuits.
• Compact Size: The small SOT-23-6 package allows integration into space-constrained applications.
• Simplified Design: Requires minimal external components, reducing board space and overall design complexity.
• Increased Reliability: Integrated overcurrent protection helps prevent damage to the converter and connected circuitry.

Additional Details:

The S-1206B42-M3T1S utilizes a Pulse Frequency Modulation (PFM) control scheme for high efficiency, especially under light load conditions. Its low start-up voltage allows for operation even with a significantly depleted battery. The integrated Overcurrent Protection (OCP) circuit protects against short circuits or excessive load currents. The device is RoHS compliant. Operating temperature range is -40°C to +85°C. The low quiescent current of the device contributes to its overall energy efficiency, making it a good choice for battery-operated systems where long standby times are required.