MAX770ESA+

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Maxim Integrated’s MAX770ESA+ is a DC-DC step-down switching controller providing an efficient, low-noise, current-mode control solution for demanding system power requirements. This device is available in two package types, a small-footprint 8-pin and an exposed pad 10-pin micro-TQFP, to maximize the available board real estate.

The primary applications for the MAX770ESA+ are in notebook computers, cellular telephones, personal digital assistants (PDAs), and other portable applications, such as digital still cameras, digital video cameras, and digital music players. The MAX770ESA+ has been engineered to support the needs of this evolving product sector, including the added complexities of multiple supply rails and the challenges of achieving minimal power dissipation.

The MAX770ESA+ features both a fault flag and an enable pin on the output control side. The fault flag is asserted during an overcurrent event, allowing the MAX770ESA+ to shut down or slow down the switching frequency to limit peak current levels. The fault flag can also be used as an interrupt source to the microprocessor, ensuring that the power supply design’s safety measures are properly implemented. The enable pin allows for retention of system information when the main power is turned off, providing a more robust power management system.

As with all DC-DC switching converters, it is important to understand the basic working priniciples of the device. A MAX770ESA+ DC-DC switching regulator, at its most basic level, simply acts as a switch that is turned on and off in order to convert an input voltage to a regulated output voltage. When the switch is turned on, the input voltage is applied directly to the output, which produces a regulated output voltage. When the switch is turned off, current flow is stopped and the output voltage is regulated by controlling the amount of time that the switch is on. This method, often referred to as current-mode control, allows the output voltage to be accurately regulated over a wide range of load currents while ensuring that the power dissipation within the converter is kept to a minimum.

In summary, Maxim Integrated’s MAX770ESA+ is a DC-DC step-down switching controller that is suitable for a variety of applications requiring efficient, low-noise, current-mode control. It boasts small-footprint packages, fault flag and enable pins, and a working principle of current-mode control. This makes it an ideal choice for applications in notebook computers, cellular telephones, PDAs and other portable systems.

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