MAX640ESA-T

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MAX640ESA-T Application Field and Working Principle

The MAX640ESA-T is an ultra-low-power fixed-frequency converter, accurately regulating the output voltage from an input voltage exceeding the output voltage by up to 10 V. It can operate down to 1.5 V and achieve efficiencies greater than 82% at 5 V IN to 3.3 V OUT , and greater than 80% at 3 V IN to 3.3 V OUT . The MAX640ESA-T is ideally suited for a wide range of portable applications, including handheld instruments, telecommunications, and computer peripherals.

Features

• Operates with inputs between 1.5V to 10V
• Fixed 0.5MHz switching frequency
• High efficiency synchronous rectifier
• Low quiescent current: 5uA typical in Shutdown
• Wide input/output range: 1.2V to 5.5V
• Programmable frequency: 40kHz - 2MHz

Application Field

The MAX640ESA-T is especially well-suited for ultra-low-power applications such as microcontroller-based portable diagnostics and instrumentation, audio systems, battery-powered devices and other handheld equipment.

Working Principle

The MAX640ESA-T is based on topology of an inductor-switch-inductor based boost-type dc-dc regulator. In a nutshell, The basic design of the MAX640ESA-T has the voltage regulator connected with a leaky inductor, which allows the output voltage to capture the input voltage over a relatively long period of time. As the output voltage starts to drop, the current coming from the input is less than what it would be without the inductor, causing the output voltage to drop. This makes it possible to regulate the output voltage even when there is an abnormally high input, thus providing a fixed output voltage even with varying input voltages.

The MAX640ESA-T is capable of drawing current from the differential between input and output. This not only helps to regulate output voltage, but also helps to achieve high efficiency, which is typically greater than 82% for 5V-3.3V applications and greater than 80% for 3V-3.3V applications.

Additionally, the MAX640ESA-T features a low-profile package and on-chip thermal protection, and supports an easy-to-use, synchronous Switch MOSFET-resistor modulation scheme. This scheme allows for greater flexibility when it comes to regulating the output voltage and improves efficiency.

Conclusion

The MAX640ESA-T voltage regulator is an ultra-low-power fixed-frequency converter, accurately regulating the output voltage from an input voltage exceeding the output voltage by up to 10V. It is ideally suited for a wide range of portable applications, including handheld instruments, telecommunications, and computer peripherals. The MAX640ESA-T is based on topology of an inductor-switch-inductor based boost-type dc-dc regulator, which allows the output voltage to capture the input voltage over a relatively long period of time. It is capable of drawing current from the differential between input and output. This not only helps to regulate output voltage, but also helps to achieve high efficiency. It features a low-profile package and on-chip thermal protection.

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