DC1725A

DC1725A demonstration circuit features LT3759 in a 485KHz boost converter, designed for a 5V/2A output from a 1.8V to 4.5V input. The LT3759 is a current mode DC/DC Boost/SEPIC/Inverting controller operating over an input range of 1.6V to 42V. The demo circuit configures the shutdown voltage at typical 1.70V, which means that the input voltage can be dropped to as low as 1.70V, once it starts up. The start-up voltage is set at 2.5V but can be adjusted by changing R1 and R2 values. The LT3759 is a current mode DC/DC controller operating over an input range of 1.6V to 42V, making it well suited for applications ranging from single-cell lithium-ion battery portable electronics to high-voltage automotive and industrial power supplies. It also exhibits low shutdown quiescent current of 1μA making it an ideal fit for battery operated systems.

• 60mV output voltage ripple at VIN = 2.5V, IOUT = 2A
• 90% typical efficiency at VIN = 4.5V, IOUT = 2A

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