MAX17497BATE+T

Duty Cycle:	92%
Base Part Number:	MAX17497
Mounting Type:	Surface Mount
Supplier Device Package:	16-TQFN (3x3)
Package / Case:	16-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	EN, Soft Start
Fault Protection:	Current Limiting, Over Voltage
Frequency - Switching:	500kHz
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 36 V
Topology:	Boost, Flyback
Voltage - Breakdown:	--
Internal Switch(s):	No
Output Isolation:	Isolated
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The MAX17497BATE+T is a hot new product category in the Power Management Integrated Circuit (PMIC) range. It combines both switching AC/DC power converter and offline switcher technology into one product. Also, this PMIC is part of Maxim Integrated’s line of devices engineer to deliver high efficiency, while providing reliable and silent operation. Integrated pulse-width-modulated (PWM) controllers, active current-mode flicker filters, over-voltage protectors, and over-current protection, make MAX17497BATE+T suitable for various applications in commercial and residential fields.

General Overview

At the heart of the MAX17497BATE+T resides a PWM controller and an active current-mode flicker filter. The former driving the buck side of the product and delivers a stable, noise-free output voltage with tight regulation and output current protection. The latter is a two-stage flicker filter and actively reduce the public power’s flicker using two successive filters and a reference voltage, with significantly lower ripple voltage than competitive solutions.

Input Voltage, Topology and Features

The wide input voltage range of the MAX17497BATE+T makes it suitable for many power applications. It features a 439V to 477V DC input and an adjustable AC input of85V to 305Vrms. The building blocks of the MAX17497BATE+T can be operated in different topologies, the buck and the boost being the most common ones. The MAX17497BATE+T features an extensive set of protection and monitoring functions making it suitable for a wide range of applications where extended system reliability is a must. It features a hard-shutdown, fault-report-capable toggle IFRM pin, and OVP functions. Also, the device has integrated low bill of material optimized protection and monitoring functionalities, like open or shorted flyback, input OVP, current limit, DCM to FCM, standby mode and compensation.

Applications

The MAX17497BATE+T is meant to be used in various applications, like off line VCIT, solar inverters and other related application fields. VCIT stands for ‘Voltage and Current Transformation’, an application field that encompasses the use of DC and AC sources, when traditional isolated and regulated supplies with relatively low power capabilities are needed. The architecture of the MAX17497BATE+T makes it a suitable product for AC/DC power applications, with the key advantages of minimizing component count, reducing the complexity of the entire design and achieving a very low solution cost. Solar inverters are one of the applications for the MAX17497BATE+T, as it is capable of efficiently driving a wide input voltage range, up to 477 V DC. By employing this PMIC, the number of components needed for the design is reduced which translates into high efficiency and low solution cost.

Working Principle

The main principle behind the MAX17497BATE+T is the combination of the buck and boost topologies. The buck controller converts a higher input voltage into a lower output voltage, while the boost takes a lower input voltage and generates a higher output voltage in order to regulate the power supply. The main difference between the buck and boost mode is that, while a buck topology can operate at a peak current of 50mA, the boost voltage can go up to 300mA of peak current. The buck regulator in the MAX17497BATE+T is constantly checking the output voltage and adjusting the duty cycle of the switching mosfet (MOSFET) in order to maintain it. In the same way, the boost regulator is constantly checking the input voltage and adjusts the duty cycle of the switching mosfet (MOSFET) in order to maintain it. The MAX17497BATE+T also makes use of an active current-mode flicker filter to reduce the public power\'s flicker using two successive filters and a reference voltage. This allows for significantly lower ripple voltage than competitive solutions.

Conclusion

In conclusion, MAX17497BATE+T is a highly efficient and reliable PMIC device that can be used in a range of applications, such as off line VCIT, solar inverters and other related applications fields. It combines the advantages of buck and boost topologies, while maintaining a very low solution cost and delivering high efficiencies. Moreover, its protection and monitoring capabilities make it suitable for applications in commercial and residential fields.

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