4.5V to 28V Input, 3A Output, Synchronous Buck Converter
The SGM61230 is a synchronous Buck converter with a wide input voltage range of 4.5V to 28V. This device can deliver up to 3A output current 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 fold-back 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.
The SGM61230 is available in a Green TSOT-23-6 package.
Wide 4.5V to 28V Input Voltage Range
3A 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
12V Distributed Power Supply Buses
Industrial and Consumer Applications
Set Top Boxes