• Wide 4.5V to 28V Input Voltage Range

• 2A Continuous Output Current

• Integrated 66mΩ/36mΩ Power MOSFETs

• Low Quiescent Current: 25μA (TYP)

• Shutdown Current: 2μA (TYP)

• 5ms Internal Soft-Start Time

• Fixed 410kHz Switching Frequency

• Pulse Skip Mode and PWM Mode

• Peak Current Mode Control

• Internal Loop Compensation

• Over-Current Protection for Both MOSFETs

• Output Over-Voltage Protection

• Adjustable Input Under-Voltage Lockout

• Thermal Shutdown with Auto Recovery

• Available in a Green TSOT-23-6 Package

The SGM61220 is a synchronous step-down converter with a wide input voltage range of 4.5V to 28V. This device can deliver up to 3A to the output over a wide input voltage. It is an easy-to-use device with power switches and peak current mode control compensation all integrated in a small 6-pin package. A typical 5ms soft-start ramp is also included to minimize the inrush current.

This device employs cycle-by-cycle peak current limit, output over-voltage protection and thermal shutdown with auto recovery. The current limit is implemented for both switches and has foldback feature to prevent overheating (and thermal shutdown) when an output short is detected. Auto recovery after over-current, output short, overheating or over-voltage fault maintains the system operational with no shutdown.

This converter has a fixed 410kHz switching frequency that minimizes the EMI noise problems. However the actual frequency drops during PSM (pulse skip mode) to maximize efficiency at light load. It also drops in some fault conditions.