MAX1644EAE+

Voltage - Output (Min/Fixed):	1.1V (2.525V, 3.33V)
Base Part Number:	MAX1644
Supplier Device Package:	16-SSOP
Package / Case:	16-SSOP (0.209", 5.30mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	Up to 350kHz
Current - Output:	2A
Voltage - Output (Max):	5.5V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable (Programmable)
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction to the MAX1644EAE+

The MAX1644EAE+ represents a high performance integrated DC/DC step-up converter with the industry-leading power density. Featuring an Input Voltage Range of 2V to 15V, the MAX1644EAE+ provides a regulated output voltage range of 2.5V to 20V, with a maximum supply current of 950mA, offering a high efficiency operation. The part can also deliver high transient current up to 600mA, making it suitable for point-of-load supplies and applications with wide input and output voltage ranges.

Application Field of the MAX1644EAE+

The MAX1644EAE+ is suitable for many applications requiring high efficiency across a wide range of temperatures. One key application for the MAX1644EAE+ is in battery applications, due to its low quiescent current and wide selection of features. The part is also used extensively in charging systems, automotive power systems, and regulated power supplies, where its high efficiency operation over a wide input voltage range is a major benefit.

Working Principle of the MAX1644EAE+

The MAX1644EAE+ is based on a switching regulator topology, which uses a field effect transistor (FET) as a switch. The FET is operated as a pulse-width modulated (PWM) controller, which “chops” the input voltage into a train of pulses. The output voltage is then derived from the frequency and duty cycle of the pulses.The device contains a PMOS switch which is operated in either pulse frequency mode or pulse-width modulation mode in order to maintain a predictable output voltage. In both modes, the duty cycle of the PMOS switch is determined by an error amplifier and an internal 10-bit analog-to-digital converter. When the output voltage is below its set point, the error amplifier increases the duty cycle in order to bring the voltage back up; conversely, when the output voltage is above its set point, the error amplifier reduces the duty cycle. The device also contains an internal current limit, which limits the amount of current delivered to the load, protecting it from over current conditions. In addition, the device features short-circuit protection, overtemperature protection, and a host of protection features for improved reliability.

Conclusion

The MAX1644EAE+ is a high performance integrated DC/DC step-up converter offering industry-leading power density at a competitive cost. With its high efficiency over a wide temperature range, low quiescent current, and wide selection of features, the MAX1644EAE+ is an ideal choice for applications requiring a high level of power conversion.

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