GENERAL DEscriptION

The SGM61433 is a current mode controlled non-synchronous Buck converter with 4.5V to 42V input range and 3.5A continuous output current. A low RDSON N-MOSFET is integrated as high-side switch. The current is as low as 148μA. The shutdown current drops to 2.65μA during shutdown (EN = low). The internal under-voltage lockout (UVLO) threshold is 4.2V and can be adjusted (increased) by an external resistor divider. An internal soft-start circuit controls the output voltage start-up ramp. Switching frequency can be selected over a wide range (0.1MHz to 2.5MHz) to allow desired tradeoff among efficiency, component sizes and conversion voltage ratio. Protection against over-voltage transient is provided to limit the startup or other transient overshoots. Secure operation in overload conditions is ensured by cycle-by-cycle current limit, frequency fold-back and thermal shutdown protection.

The SGM61433 is available in a Green SOIC-8 (Exposed Pad) package.

FEATURES

• 4.5V to 42V Input Voltage Range

• 0.8V to 36V Adjustable Output Voltage Range

• Integrated 68mΩ High-side MOSFET Supports up to 3.5A Continuous Output Current

• Programmable Switching Frequency: 100kHz to 2500kHz

• Ultra-Low Current: 148μA (TYP)

• Low Shutdown Current: 2.6μA (TYP)

• Power-Save Mode for High Light Load Efficiency

• Frequency Synchronization to External Clock

• Programmable UVLO Threshold

• Over-Voltage Transient Protection

• Cycle-by-Cycle Current Limit

• Frequency Fold-Back Protection

• Integrated BOOT Recharge FET for Low Light Load Dropout

• Thermal Shutdown (+176℃)

• Available in a Green SOIC-8 (Exposed Pad) Package

APPLICATIONS

USB Dedicated Charging Ports

Industrial Power Supplies

Battery Chargers