MAX857CSA+

Voltage - Output (Min/Fixed):	2.7V
Base Part Number:	MAX857
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:	500mA (Switch)
Voltage - Output (Max):	6V
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	0.8V
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

MAX857CSA+ is a high-efficiency, low-noise, synchronous step-down dc-dc regulator, which belongs to the PMIC (power management integrated circuit) family of voltage regulators. It uses switching topology and a fully integrated PWM controller to provide ultra-low-noise power conversion. It is well-suited for automotive and industrial applications because of its wide input voltage range and output current capability.

Features and Benefits

MAX857CSA+ provides many features and benefits compared with its competitors. It offers ultra-low quiescent current in both shutdown mode and no-load operation, ultra-low output ripple and noise, adjustable high-bandwidth frequency (500 kHz and 600 kHz) for maximum system desirability and efficiency, optimized transient response with ultra-low noise conversion, adjustable soft-start for load conditions, and integrated Fault and UVLO protection for overcurrent and overvoltage conditions. In addition, the device provides a low-noise enable input, separate soft-start enable input, and accurate regulation over a wide output voltage and current range.

Application and Working Principle

The MAX857CSA+ provides a low-noise, highly efficient power supply solution for wide input voltage range applications and is suitable for a variety of applications, such as automotive, industrial, medical, and communications equipment. The device operates in a step-down switching mode and contains a fully integrated low-noise PWM controller. The PWM controller provides accurate regulation and tightly regulated output voltage, even in applications with wide input line or load transients. The device also features a low-noise enable input for power-on or extended power-off control.The MAX857CSA+ provides integrated over-current protection and over-voltage protection to protect downstream circuitry from faults due to overload, short circuit, and over-voltage conditions. An adjustable soft-start feature reduces output inrush current and helps to limit system power surge during startup. The device also integrates adjustable ripple rejection, low-noise conversion, and precise regulation of output voltage. The output voltage can be adjusted over a wide range using output voltage control pins, and is set using an external resistor divider network.

Conclusion

In conclusion, the MAX857CSA+ is a high-efficiency, low-noise, synchronous step-down dc-dc regulator that provides features and benefits such as ultra-low quiescent current, ultra-low output ripple and noise, adjustable high-bandwidth frequency, optimized transient response, adjustable soft-start, and integrated fault and UVLO protection. It is ideally suited for automotive, industrial, and other applications that require a wide input range and a high current capability.

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