MAX844ESA+T

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The MAX844ESA+T is a special-purpose CMOS voltage regulator, designed to provide highly regulated 3.3V or 5V output from a wide range of unregulated 6V to 20V input supply sources. The MAX844ESA+T is designed for automotive, industrial, and telecom applications. Its wide input voltage range, low quiescent current, high-efficiency switching topology, and built-in protection features provide better power efficiency and performance than existing linear regulator filtering techniques.

The MAX844ESA+T application field works by using a buck converter based on a fixed frequency pulse width modulated (PWM) control scheme. The core of the MAX844ESA+T is a wide input voltage range, low noise, high efficiency, switched capacitor PWM buck converter operating in a constant frequency current mode. This allows the fixed-frequency operation of the design to be easily shifted to a higher frequency range in order to reduce the size of the output filter components and further improve efficiency.

The PWM frequency of the MAX844ESA+T is internally programmed to a fixed 350kHz, optimized frequency. This allows easy implementation and fast control loop switching times. The proposed design also includes a high efficiency synchronous rectifier and an independent soft-start circuit which is designed for input voltage stabilization. The independent soft-start circuit also lowers the surge current required when starting up.

To further improve the power efficiency, the MAX844ESA+T features a power saving function, in which the system automatically goes into a lower power state when the output current is below a certain level. Additionally, the device features a power good (PG) function, which indicates when the output voltage has reached its desired regulation voltage.

The MAX844ESA+T also features a number of protection features. These features include over-voltage protection, over-temperature protection, reset, and overload protection. Each of these features is designed to protect the device and its components against any fault conditions. Additionally, the chip incorporates an internal fast transient protection which is designed to protect the converter from input voltage transients such as those caused by hot plugging.

The MAX844ESA+T provides regulated output with a maximum load current of 1.8A and a maximum dropout voltage of 0.6V. The device also supports a wide input voltage range up to 20V and a wide output voltage range of 4.5V to 5.5V for the 3.3V mode and 9V to 20V for the 5V mode. The MAX844ESA+T is designed for high efficiency and up to 91.5% power efficiency in a 3.3V and 93.7% in a 5V mode.

The MAX844ESA+T features low quiescent current and low shutdown current, making it an ideal order for battery powered applications. The chip is available in a 1mm x 2mm x 0.4mm ("MCT") 0.4mm pitch, quad-flat no-lead (QFN) package and operates at a temperature range of -40°C to +85°C.

In conclusion, the MAX844ESA+T is a special-purpose CMOS voltage regulator designed to provide efficient and reliable voltage regulation. It uses a buck converter based on a fixed frequency PWM control scheme with a wide input voltage range, low noise, and high efficiency. It comes with built-in protection features and its low quiescent current and low shutdown current makes it an ideal choice for automotive, industrial, and telecom applications.

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