ADI Launches Multi-Topology PWM Controller Configurable with Any Converter
Published2017.09.12 15:13
Analog Devices has announced the launch of the LT8711, a multi-topology current-mode PWM controller that can be easily configured as a synchronous buck, boost, SEPIC, and ZETA DC/DC converter, or an asynchronous buck-boost converter.
This product can improve efficiency by replacing the output diode with a high-efficiency P-channel MOSFET and can increase output current up to a maximum of 10A. The new product can be applied across a wide range of fields including automotive, industrial, solar, and general-purpose applications.
The LT8711 operates in an input voltage range of 4.5V to 42V, with output voltage depending on external component selection. The quiescent current under no-load conditions is as low as 15μA, which can extend operating time in battery-driven systems. Low-ripple Burst Mode operation maintains low output voltage ripple while achieving high efficiency under light load conditions. When configured as a synchronous buck converter, the LT8711 can operate at 100% duty cycle, making it very useful in systems powered by discharging batteries.
The LT8711 includes an innovative EN/FBIN pin circuit for input voltage regulation to prevent voltage sag from high-impedance input sources such as solar panels. This pin is also utilized for adjustable undervoltage lockout (UVLO). The fixed operating frequency can be selected between 100kHz and 750kHz and can be synchronized to an external clock. Additionally, it provides dual-chip power supply input, topology selection pin, and adjustable soft-start function.
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