GENERAL DEscriptION
The SGM61234 is a 5V fixed output, non-synchronous Buck converter with a wide input voltage range from 6.5V to 28V and 2A output current capability. This device uses peak current mode control with slope compensation. Pulse skip mode (PSM) feature is included to reduce losses at the light loads.
The switching frequency is adjustable from 50kHz to 1.1MHz with an external resistor (RT). Spread spectrumue is used for the switching frequency to avoid high power peaks in EMI. For further reduction of the EMI, an anti-ringing circuit is added on the switching node (SW) to damp the oscillations in DCM.
Natural cycle-by-cycle current limit and an included frequency foldback mechanism protect the device against over-current and short-circuit faults. Thermal shutdown protection is also provided to save the device if the junction temperature reaches +170℃.
The SGM61234 is available in a Green SOIC-8 (Exposed Pad) package and can operate in the -40℃ to +125℃ ambient temperature range.
FEATURES
Wide 6.5V to 28V Input Voltage Range
5V Fixed Output Voltage
2A Maximum Continuous Output Current
PSM Feature for Improved Light Load Efficiency
Peak Current Mode Control
Cycle-by-Cycle Over-Current Protection
Frequency Foldback Output Short Protection
50kHz to 1.1MHz Adjustable Switching Frequency
120kHz Default Frequency (No Set Resistor)
Spread Spectrum to Reduce EMI Peaks
Switching Node Anti-Ringing for EMI Reduction
Adjustable Soft-Start
Available in a Green SOIC-8 (Exposed Pad) Package
APPLICATIONS
Home Appliances
Distributed Power Systems
CPE Equipment
Set-Top Boxes
LCD Displays
Battery Chargers