MAX734CSA+

Series:	--
Packaging:	Tube
Part Status:	Active
Applications:	Converter, Flash Memory
Voltage - Input:	3 V ~ 12 V
Number of Outputs:	1
Voltage - Output:	12V
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	8-SOIC
Base Part Number:	MAX734

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Introduction

MAX734CSA+ is a special purpose voltage regulator designed by Maxim Integrated. It provides synchronization, voltage-level shifting, and voltage-level translating capability. The regulator supports buck and boost switching regulators, allowing the user to choose optimal operations for a wide range of output voltages and current levels. In addition to synchronizing, voltage-level shifting, and voltage-level translating, MAX734CSA+ also provides a comprehensive fault protection circuit, allowing it to stay reliable in a variety of system applications. This article explores the application fields and working principle for MAX734CSA+.

Application Fields

MAX734CSA+ is a versatile voltage regulator suitable for many applications such as computing and communications. It is particularly well-suited for a wide variety of mobile applications such as laptops and phones, as well as automotive and industrial applications. The MAX734CSA+ can be used to synchronize multiple switched-mode power supplies by providing a voltage level shifting and voltage-level translating capability. The MAX734CSA+ also provides a comprehensive fault protection circuit, allowing it to stay reliable in a variety of system applications.The MAX734CSA+ can also be used to design a wide range of high-efficiency, low-noise, high-current and low-footprint switching regulators for applications requiring battery or mains power with a wide input voltage range and the ability to regulate and adjust output voltage levels. The MAX734CSA+ also has integrated soft-start and shutdown circuitry, allowing it to gracefully start and shut down a system.

Working Principle

The MAX734CSA+ can buck and boost cycle at up to 2.2MHz. The device contains a low dropout, 200mA linear regulator and an adjustable buck-boost controller. The controller consists of an oscillator, error amplifier, driver stage, current-sense amplifier and voltage-sense amplifier. The precision, low noise linear regulator is used to power the controller and to prevent overshooting at the output due to a rapid load transient. The MAX734CSA+ uses the voltage-sense and current-sense amplifiers to sense the output voltage and inductor current of the buck-boost converter, respectively. The inductor current sensing also provides a constant-power feature that allows the user to set a fixed power delivery irrespective of the output voltage. A high efficiency can be achieved by using synchronous rectification for the buck-boost cycle. When the LM734\'s synchronous rectification feature is enabled, the integrated power N-Channel MOSFETs are used to switch the current paths between the inductors and the output according to the buck-boost cycle. The built-in synchronous rectification helps reduce the conduction losses and switch losses experienced by the inductors and helps achieve higher efficiency. The MAX734CSA+ can also improve the efficiency of very low duty cycle applications, like those found in PoE systems, thanks to the Constant On-Time (COT) feature. The COT feature allows the user to set a desired minimum on-time, which improves the overall efficiency of the regulator while limiting the output voltage ripple when running at low duty cycle.

Conclusion

In summary, MAX734CSA+ is a versatile and reliable special purpose voltage regulator suitable for a wide range of applications. The device supports synchronizing, voltage-level shifting, and voltage-level translating and is equipped with a comprehensive fault protection circuit. The MAX734CSA+ also offers synchronous rectification and constant on-time features, allowing it to achieve optimal efficiency while maintaining low output voltage ripple in most operating conditions.

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