LT8551 Multiphase Expander

Analog Devices LT8551 Multiphase Expander is a multiphase expander for synchronous boost DC/DC converters. The LT8551 operates in tandem with any synchronous boost DC/DC converter to increase the load current capability by adding additional phases. These phases are clocked out of phase to reduce ripple current and filtering capacitance. The device easily adds phases without the need to route sensitive feedback and control signals. The Analog Devices LT8551 integrates 5V gate drivers and can support up to four boost phases per device. Multiple LT8551 devices can be used for up to 18 phases. The device accurately monitors and adjusts the current of each channel to achieve excellent DC and transient current sharing. The LT8551 operates over a fixed frequency from 100kHz to 1MHz or can be synchronized to an external clock.