MAX1684EEE+T

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The MAX1684EEE+T is a Buck-Boost DC-DC switching converter that can be used to efficiently transfer power between two different power sources. It is a monolithic integrated circuit (IC) which combines a synchronous buck-boost regulator, a low-dropout linear regulator, and a power logic supervisor into one package.

The MAX1684EEE+T application field can be broken down into two main areas: industrial and consumer. The industrial applications include: Battery-powered products, Power management in battery-backed systems, Solar energy harvesting applications, Automotive electronics, and LED lighting systems. In the consumer sector, the MAX1684EEE+T can be seen in mobile devices, computers, HDTVs and other handheld digital devices.

The MAX1684EEE+T operates from a pair of input supply rails and provides regulated output voltage of 0.6V to 28V. It operates from input voltages ranging from 0.5V to 36V. Internally, it powers up in boost configuration and provides superior efficiencies for input/output voltages that are significantly mismatched. The synchronous rectifier architecture switches at a frequency up to 1.2 MHz and it is designed to minimize EMI and maximize the power conversion efficiency.

The DC-DC switching regulator is the core of this chip, and it works by regulating an incoming voltage with a switch, or a set of switches, to vary the output voltage. The switching and soft-start functions are controlled by an integrated controller. The controller adjusts the power switch and linear regulator constants, such as the current limit, feedback gain, and output voltage, as needed. It also receives feedback from an external temperature sensor to reduce the chip’s temperature, allowing the MAX1684EEE+T to operate over a wide range of temperatures and maintain constant output voltage.

The output voltage is set by the external resistive divider. An external soft start capacitor can be used to ramp the output voltage at power up. The chip features an adjustable current limit, undervoltage, and overvoltage lockout protection for additional safety. It also has an internal soft-start circuit that limits the inrush current. The internal power switch can provide up to 3A of input-output current.

In summary, the MAX1684EEE+T is an efficient and robust DC-DC switching regulator for industrial and consumer applications. It combines a synchronous buck-boost regulator, a low-dropout linear regulator, and a power logic supervisor into one package. Its output voltage is set by an external resistive divider, while its current limit and other parameters are controlled by the integrated controller. The internal power switch can provide up to 3A of input-output current and the chip is designed to minimize EMI and maximize the power conversion efficiency.

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