MAX5068EAUE

Frequency - Switching:	12.5kHz ~ 625kHz
Base Part Number:	MAX5068
Supplier Device Package:	16-TSSOP-EP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Dead Time Control, Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	75%
Series:	--
Voltage - Supply (Vcc/Vdd):	10.8 V ~ 24 V
Output Phases:	1
Number of Outputs:	1
Topology:	Flyback
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The MAX5068EAUE is a dual-channel step-down DC-DC controller from Analog Devices with a variety of features. In terms of physical space, it is a 3.5mm x 3.5mm QFN package. The MAX5068EAUE provides high efficiency and power density in critical power applications, allowing for the design of small, cost-optimized solutions.

Features

The MAX5068EAUE offers the following features: • Dual high-performance step-down DC-DC converters • 4.3V to 22V input voltage range • Voltage-mode/current-mode control • Programmable current limit and regulation voltage • Programmable soft-start • Integrated gate drivers • High-speed cycle-by-cycle current limit • Integrated low-side power MOSFET • Undervoltage lockout • Programmable minimum-on-time • Programmable peak-current mode slope compensation

Applications

The MAX5068EAUE is ideally suited for a variety of power management solutions such as: • Telecom systems • Processor core/memory power • Portable audio applications • Battery management • High-efficiency LED lighting • High-efficiency power systems

Working Principle

In general, step-down DC-DC converters are used to convert a higher input voltage to a lower output voltage by employing a converter topology consisting of a switch, an inductor, and a capacitor. It works by switching the higher input voltage through the switch and inductor and then to the output capacitor, which charges up. The two most common converter topologies are the buck and the synchronous buck converters. The MAX5068EAUE is a dual-channel DC-DC controller with voltage mode/current mode control and synchronous buck topology. The controller employs an analog multiplier as its error amplifier, and it offers user-configurable current limitation, soft-start, and programmable protective features. The dual-channel synchronous DC-DC converter topology is used to step down a higher input voltage to a lower output voltage. This is achieved by using two MOSFETs, an inductor, and a capacitor. When the high-side MOSFET is in the ON state, the inductor stores energy from the input voltage and current increases. When the low-side MOSFET is in the ON state, the stored energy is released and flows through the output capacitor, charging it. The MAX5068EAUE steps this down and regulates the output voltage by sensing the current and controlling the duty cycle of the MOSFETs.The MAX5068EAUE also offers a number of other features, including:• Internal voltage and current limit • Dynamic tracking • Soft inrush current protection • Integrated deadtime control • Powergood output reporting • Integrated overvoltage protection

Conclusion

The MAX5068EAUE is a dual channel step-down DC-DC controllers from Analog Devices perfectly suited for critical power applications in space-constrained applications. With its integrated gate drivers, programmable current limit and regulation voltage, current-mode/voltage-mode control, and a variety of other features, the MAX5068EAUE is an ideal solution for portable audio applications, telecom systems, and battery management.

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