MAX751ESA+

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PMIC - Voltage Regulators - DC DC Switching Regulators refer to integrated circuits that provide a controlled output regulated voltage from either an AC or DC input circuit. One type of DC DC switching regulator is the MAX751ESA+, available from Maxim Integrated. This device is designed to provide a reduced-cost, highly efficient solution for supplying low voltages, ranging from 1.2 to 3.3V, from a 4.75V - 12V input source.The MAX751ESA+ integrates a high-performance DC-DC step down regulator along with integrated MOSFET switches and associated circuitry to form a complete low-cost, single-chip Buck regulator solution for a wide range of applications. This solution lends itself to applications requiring reliable power conversions at 1.2V to 3.3V and ultra-low dropout.The MAX751ESA+ enables the user to have reliable and cost-effective power supply solutions. Several pins of the device can be used to monitor power supply conditions, such as under-voltage, over-voltage and over-temperature, thus advancing system reliability. Furthermore, the device is available in an 8-pin SOIC package which eases board space requirements, lowers system costs, and enables wide applications.The MAX751ESA+ works by first receiving an input voltage, typically 4.75-12V, supplied by an AC/DC Adapter or battery. The device then internally makes all necessary changes to create a regulated output, which can range from 1.2 to 3.3V, depending on the usage requirements. The device uses a silicor-based voltage-mode switching controller that includes a low-side MOSFET and a high-side integrated gate, the maxSWITCH, which is the device’s main power switch.The MCU (Microcontroller Unit) inputs a control signal, which is typically transformed into an analog signal in the form of a ramp wave. The MAX751ESA+ then regulates the ramp wave to create a variable duty cycle, which enables the device to output a regulated voltage at the output terminal. A duty cycle of 50% results in an output voltage equal to the input voltage, while a duty cycle of 0% provides 0V at the output terminal and a duty cycle of 100% provides an output voltage equal to 3.3V.The MAX751ESA+ can be used in a wide range of applications, from household devices to medical devices. It is used in response to ever increasing demands for lighter, more compact and better performing power supply solutions. For example, it may be used for cell phones, PDAs, digital cameras, digital video cameras, portable medical instruments, blood analyzers, professional audio mixers, and laptop PCs.In summary, the MAX751ESA+ is a highly efficient and cost-effective DC to DC switching regulator solution for providing regulated voltages from a 4.75-12V input source. The device uses a voltage-mode switching controller with low-side MOSFET and integrated gate maxSWITCH to provide a regulated output of 1.2-3.3V. This makes it ideal for applications requiring reliable power conversions and ultra-low dropouts. The device also allows for several pins to be monitored, increasing system reliability. The MAX751ESA+ provides a reliable and cost-effective solution that makes it suitable for a wide range of applications.

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