60Vin, Dual, 2-Phase Boost Controller Released
Cascade configuration, regulates up to 200V or higher
On September 28, Analog Devices released the LTC7840, a 2-phase asynchronous boost controller capable of driving two external N-channel power MOSFETs.

The LTC7840 can be configured as a single or dual output boost regulator, and the output voltage can be increased to several hundred volts (V) or more by connecting the output of the first channel to the input of the second channel for a higher output voltage.

The LTC7840 application is suitable for automotive, industrial, and medical applications because it boosts a 12V input voltage to 48V on the first channel and boosts this 48V to a 240V output voltage with an output current of up to 700mA on the second channel.

The LTC7840 operates within an input voltage range of 5.5V to 60V, and the output voltage is determined by the selection of external components. This product allows for clocking up to four power stages out of phase, thereby minimizing input/output filtering requirements. The external MOSFET switches at a fixed frequency that can be set in the range of 50 kHz to 425 kHz and can be synchronized with an external clock.

Each channel of the LTC7840 can be flexibly configured with SEPIC or flyback topologies. In addition, it supports various functions such as an adjustable maximum duty cycle, adjustable minimum on-time, overvoltage and undervoltage protection, and peak current mode control.

The LTC7840 is supplied in low-profile, thermally enhanced 28-pin 4mm x 5mm QFN and TSSOP packages. Depending on the operating temperature range, it is available in Grade E and Grade I products operating from –40°C to 125°C, and Grade H products operating from –40°C to 150°C.