DC-DC controller provides five converter topologies at up to 10A output
Linear Technology offers the LT8711, a multitopology current mode PWM controller that can easily be configured as a synchronous buck, boost, SEPIC and ZETA DC-DC converter, or as a nonsynchronous buck-boost converter. This device replaces the output diode with a high efficiency P-channel MOSFET, thereby increasing efficiency and maximum output current up to 10A, making the device highly versatile for a wide range of automotive, industrial, solar and general purpose applications.
The device operates over a 4.5V to 42V input voltage range and produces an output voltage that is dependent on the choice of external components. The 15µA no-load quiescent current with the output voltage in regulation extends operating run time in battery powered systems. Low ripple Burst Mode operation enables high efficiency at very light loads while maintaining low output voltage ripple. When configured as a synchronous buck, the device can operate at 100% duty cycle, a useful feature when powered from a battery that is discharging.
The device features innovative EN/FBIN pin circuitry for input voltage regulation to avoid collapsing a high impedance input source such as a solar panel. This pin is also used for adjustable undervoltage lockout. The fixed operating frequency is selectable from 100kHz to 750kHz and can be synchronized to an external clock. Additional features include dual chip power supply inputs, a topology selection pin and adjustable soft-start.