MAX1947ETA18+T

Voltage - Output (Min/Fixed):	1.8V
Base Part Number:	MAX1947
Supplier Device Package:	8-TDFN-EP (3x3)
Package / Case:	8-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	Up to 2MHz
Current - Output:	273mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	3.6V
Voltage - Input (Min):	0.7V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction
The MAX1947ETA18+T is a DC to DC switching regulator designed by Maxim Integrated to maximize power efficiency within 1.8V to 3.6V input voltage range. The regulator can provide an output of up to 2A and has adjustable switching frequency, current-limit protection and excellent ripple rejection that make it suitable for low-power and heavily loaded applications. This article will discuss the MAX1947ETA18+T application field and its working principle.

The Application Field of MAX1947ETA18+T
The MAX1947ETA18+T is suitable for a variety of applications, as its features make it a versatile and cost-effective choice for many commercial and industrial applications. The device is most suitable for low-power products, such as single-cell Li-ion battery-powered systems, including stereo headsets, Bluetooth headsets, portable medical and military equipment, and active antenna applications. The adjustable switching frequency of the regulator can also be useful for clock distribution applications.

The Working Principle of MAX1947ETA18+T
The MAX1947ETA18+T works by controlling the switching rate of the buck converter, a topology that uses a power switch to convert a higher input voltage to a smaller output voltage. During the on state of the switching cycle, energy is stored in the inductor and boost diode, and then is passed to the output voltage as the switch turns off. The key parameters of the device are set by an internal sense resistor that senses the output voltage and an internal switching regulator loop. This loop is used to adjust the duty cycle according to the output voltage to maintain the correct voltage regulation.The device also has a low noise operation mode, which reduces switching noise when the load is light. This mode reduces power dissipation and improves efficiency, making it suitable for quiescent current-sensitive applications. Additionally, the device can be used with a synchronous rectifier for higher efficiency in applications that require more output current.

Conclusion
In conclusion, the MAX1947ETA18+T DC to DC switching regulator is a versatile and cost effective solution for low-power applications. Its adjustable switching frequency and low noise operation make it particularly suitable for low-power and heavily loaded applications, such as those found in portable medical or military devices. Its internal sense resistor and switching regulator loop further ensure correct output voltage regulation and improved power efficiency, making it an ideal choice for a variety of applications.

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