MAX757CSA+

Voltage - Output (Min/Fixed):	2.7V
Base Part Number:	MAX757
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz
Current - Output:	--
Voltage - Output (Max):	5.5V
Series:	--
Voltage - Input (Max):	7V
Voltage - Input (Min):	0.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tube

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Introduction

Maxim MAX757CSA+ is a DC to DC switching regulator. It is a high frequency step-down switching regulator that converts a 3.3V to 45V DC voltage input to a regulated 1.25V to 37V DC output voltage. It offers constant current and constant voltage operation for loads up to 1.2A. The MAX757CSA+ has a high efficiency of up to 93%, allowing for low power consumption and a wide input voltage range. It features a precision 0.9V reference and over-voltage protection, making it ideal for applications requiring reliable power conversion. The MAX757CSA+ is designed to safely and accurately regulate a 3.3V to 45V input voltage range and provide a regulated 1.25V to 37V DC output voltage. This regulator provides adjustable current and voltage output regulation and features a 0.2V output voltage accuracy. It also features over-voltage (OVP) protection, under-voltage lockout (UVLO), soft start and current limit protection.

Application Field

The MAX757CSA+ is ideal for a wide range of applications from automotive to industrial and medical. Automotive applications include vehicle power management, LED lighting, and infotainment systems. Industrial applications include AC/DC, DC/DC conversions, low power lighting, and power supplies. Medical applications include infusion pumps, patient monitors, power injectors, and surgical devices.

Design Considerations

There are a few important design considerations when using the MAX757CSA+ in an application. The input and output voltage range, along with output voltage accuracy, should all be taken into account. It is important to note that the MAX757CSA+ can support only up to 1.2A output current. The device also features over-voltage protection and soft start, which should be enabled in order to protect the device.

Working Principle

The MAX757CSA+ operates on a simple principle. When VIN and VOUT are connected, a current loop is formed between the regulator’s internal switch and its rectifier, so that when VIN changes, the DC output voltage is automatically adjusted. The internal circuit of the MAX757CSA+ uses a quasi-square wave topology and has an internal switch to convert the input voltage to the regulated output voltage. When the voltage at the input changes, the internal switch will turn on and off at a rate determined by a control loop. This is known as pulse-width modulation (PWM). As the output voltage is controlled by the on/off switching of the internal switch, it is able to provide an accurate and stable output voltage. The MAX757CSA+ also features an over-voltage protection circuit. The OVP circuit monitors the output voltage and will shut down the device if it exceeds the preset OVP threshold. This is an important feature that helps protect the device from potential damage caused by over voltage conditions.

Conclusion

In conclusion, the MAX757CSA+ is a versatile, high performance switching regulator designed to efficiently convert a 3.3V to 45V input voltage range to a regulated 1.25V to 37V output voltage range. It offers adjustable voltage and current output regulation and features over-voltage protection, under-voltage lockout, and soft start. This makes it ideal for applications requiring compliance with a variety of voltage and current requirements. Its high efficiency and low power consumption make it an ideal choice for automotive, industrial, and medical applications.

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