It is configurable as single or dual output boost regulator or for higher voltages, the output of the first channel can feed the input of the second channel, allowing an output voltage which exceeds several hundred volts.
A typical LTC7840 application is for a 12V input voltage to be boosted to 48V, with the first channel and the second channel boosting the 48V to 240V with an output current of up to 700mA. This, according to Analog Devices, makes it “ideal for automotive, industrial and medical applications”.
The LTC7840 operates over an input voltage ranging from 5.5V to 60V and regulates output voltages that are limited by the choice of external components. Up to 4 power stages can be clocked out-of-phase to minimise input and output filtering requirements.
External MOSFETs switch at a fixed frequency programmable from 50kHz to 425kHz and can be synchronised to an external clock. Each channel of the LTC7840 can also be configured as a SEPIC or flyback topology. Additional features include adjustable maximum duty cycle, adjustable minimum on-time, overload and overvoltage protection, along with peak current mode control.
