MAX1678EUA+

Voltage - Output (Min/Fixed):	2V (3.3V)
Base Part Number:	MAX1678
Supplier Device Package:	8-uMAX
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	150kHz
Current - Output:	550mA (Switch)
Voltage - Output (Max):	5.5V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	0.7V
Number of Outputs:	1
Output Type:	Adjustable (Fixed)
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tube

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Introduction

The MAX1678EUA+ is a PMIC (Power Management Integrated Circuit) that is part of the DC DC switching regulator family. It provides a cost-effective and highly efficient solution for controlling power supplies in a wide variety of applications.

Feature Overview

The MAX1678EUA+ provides excellent transient response, low quiescent current, and low output ripple current. It is designed to work in a wide input voltage range from 2.5V to 18V, and output voltage is adjustable from 0.5V to 15V. It features internal compensation, thermal shutdown protection, current limit protections, and soft-start. The device is fanless, and provides optimized efficiency in a wide range of load conditions.

Application Field

The MAX1678EUA+ is ideal for high power applications such as battery-powered consumer electronics, industrial equipment, and wireless transmitters. It can be used as a constant or adjustable buck/boost regulator for automotive and industrial applications, or as a multi-output converter for multi-rail point-of-load applications. The device is also suitable for use in harsh automotive environments, offering both over-voltage and under-voltage protection.

Working Principle

The MAX1678EUA+ is a synchronous switching regulator that uses two internal power transistors, one N-channel MOSFET and one P-channel MOSFET, to step down or step up an input voltage and supply a controlled output voltage. The device operates in two modes. In the step-down (buck) mode, the N-channel MOSFET is used to reduce the input voltage to the desired output voltage. In the step-up (boost) mode, the P-channel MOSFET is used to increase the input voltage to the desired output voltage.The synchronized switching of the two internal power transistors is regulated by an internal clock. During each cycle of operation, the device continuously monitors the output voltage and adjusts the switching frequency of the internal transistors to maintain the desired output voltage. Additionally, the MAX1678EUA+ features an adjustable soft-start that can be used to reduce inrush current during start-up and to avoid excessive stress on the input power supply.

Conclusion

The MAX1678EUA+ is a cost-effective and efficient PMIC device that provides precise and consistent power supply regulation. It offers excellent transient response, low quiescent current, and low output ripple current. It can be used in a large array of applications across many different industries, providing efficient power supply control solutions.

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