MAX1673ESA+

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Power management integrated circuits (PMICs) play an essential role in the electric performance, functionality, longevity, and energy efficiency of modern electronic systems. PMICs such as voltage regulators are needed for converting a battery or other power source into the form required for powering the electronics of a system. Voltage regulators such as DC/DC switching regulators provide a cost-effective solution for converting one DC supply voltage to another DC voltage within a wide input voltage range. The MAX1673ESA+ is a DC/DC switching regulator that can provide a wide range of output voltages from 2.5 V to 5.5 V and can produce output currents up to 1.5 A.

MAX1673ESA+ Application Fields

The MAX1673ESA+ is ideally suited for a variety of applications such as industrial systems, networking, and embedded computing applications, as well as high-performance portable electronics. It can be used in applications such as handheld personal digital assistants (PDAs), personal computers (PCs), cell phones, media players, and medical systems. The MAX1673ESA+ can also be used in other applications such as automotive and aerospace, where reliability and wide input ranges are critical components. Additional applications include power supplies and battery charging.

Working Principle of the MAX1673ESA+

The MAX1673ESA+ is a DC/DC synchronous buck switching regulator that uses a switching technique to convert an input voltage (Vin) to a regulated output voltage (Vout). It features an adjustable output voltage range from 2.5 V to 5.5 V, output current up to 1.5 A, and a wide operating input voltage range from 2.0 V to 16 V. The device includes an internal voltage-mode digital PWM controller and the necessary power switches to form a complete voltage regulator. The internal digital PWM controller operates in an open-loop, non-linear control fashion and drives an external N-channel power MOSFET. The PWM controller provides a high peak-current slew rate, low output noise, and excellent line and load regulation.

The MAX1673ESA+ is different from other DC/DC buck regulators in that it utilizes synchronous rectification, an improved conversion efficiency compared to other single inductor flyback regulators. The forcer drive logic, which is an internal comparator on the device, senses the output current and actively forces the synchronous rectifier off when the output current reaches its maximum 1.5A limit. This ensures that the device achieves its full output current rated power, while protecting the components from thermal overload and current limit damage.The MAX1673ESA+ integrates over-current protection and thermal shutdown circuitry, to protect the device and the system, a logic selectable power save mode which reduces the quiescent current, and current-mode PWM control with adaptive on-time control which improves dynamic load response and line regulation.

Conclusion

The MAX1673ESA+ is a DC/DC switching regulator that offers a wide input voltage range, a wide adjustable output voltage range from 2.5 V to 5.5 V, and output current up to 1.5A. The device is suitable for applications such as handheld PDAs, PCs, cell phones, media players and medical systems, in addition to automotive and aerospace where reliability and wide input ranges are important considerations. The device includes internal over-current protection and thermal shutdown circuitry, a logic selectable power save mode, and current-mode PWM control with adaptive on-time control to improve dynamic load response and line regulation.

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