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  • 24V, 300mA, Buck Converter

  • Created: May 03, 2016

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The buck converter is a switching regulator that converts power from DC to a lower DC voltage. It converts the power by stepping down the voltage while stepping up the current from its input supply to its output. Unlike other power converter like the linear regulators that lowers voltage by dissipating power as heat, but does not step up output current. Since it dissipates power as heat, it means that it has a lower efficiency. The DC-to-DC converter provides much greater power efficiency than the linear regulators in that it can have efficiency above 90%. The MAX77596 is a synchronous buck converter with integrated switches. The device can output fixed voltages of 3.3V and 5V from input voltages of 3.5V to 24V. It also has a 1.1uA quiescent current at no load. It has 86% peak efficiency at 12Vin, 3.3Vout.

The circuit can operate over a 3.5V to 24V of input voltage range. The output of the MAX77596 IC regulator can be adjusted from 3.3V to 5V voltage range. The J1 jumper is used to enable control of the IC regulator. Shunting pin EN to pin SUP will enable the IC regulator while shunting pin EN to GND will disable the IC regulator. The J2 jumper is used for mode control, either forced-PWM or skip mode (low-quiescent current skip mode). When connecting the BIAS pin to MODE pin by shunting them will enable FPWM mode. When the MODE pin is shunt to GND pin, it enables skip mode.

The MAX77596 IC regulator can operate near dropout by running at 98% duty cycle. This makes the MAX77596 ideal for applications such as battery-powered, portable devices, USB type-C devices, and point-of-load applications.



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