MAX668EUB+

Frequency - Switching:	100kHz ~ 500kHz
Base Part Number:	MAX668
Supplier Device Package:	10-uMAX
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	90%
Series:	--
Voltage - Supply (Vcc/Vdd):	3 V ~ 28 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, SEPIC
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

MAX668EUB+ is an ultra-fast, high-efficiency and low quiescent current synchronous DC-DC buck application-specific integrated circuit (ASIC). Consolidating high- frequency and low-noise throughput rate, it provides excellent efficiency and small form factor for a wide range of high-volume power conversion applications, making it the ideal choice for space-constrained high-performance systems.

Application Field and Working Principle

MAX668EUB+ operates as a DC-DC switching controller, implementing a synchronous buck with a single low-side switch. The controller is optimized for computing, datacom and telecom applications. The asic uses voltage-mode control and adaptive on-time. The operating frequency and pulse width and frequency modulation (PWM)/ pulse-frequency modulation (PFM) control can be set through externally-applied resistors.The MAX668EUB+ provides an integrated soft-start capability to minimize inrush current during startup and the input current limit slope is adjustable in 2-millisecond increments. The IC’s on-time can be adjusted to reduce output ripple at light loads, and it also features an adjustable operating frequency that eliminates the need for an external clock. The IC provides full-frame synchronization without any extra components, enabling a continuous synchronized output across multiple output devices.The asic supports step-down operation from a differential input voltage to a single output voltage. It provides adjustable output voltage ramp-up and ramp-down slew-rate control for a wide range of control loop dynamics.The MAX668EUB+ supports PWM/Frequency Modulation (PFM) mode, allowing the user to optimize the output regulation characteristics for the best transient response without sacrificing efficiency. It provides output voltage sequencing with external switching and an adjustable soft-start function.

Advantages of MAX668EUB+

The asic incorporates various features including:

• High-efficiency, low quiescent current
• Integrated voltage-mode control
• External slew rate limit control
• Adaptive on-time PWM/PFM controller
• Full-frame synchronization
• 2-ms step size input current limit adjustment
• Output voltage sequencing with external switching
• Adjustable soft-start
• Voltage-run and frequency-run during normal operation
• Synchronous rectifier implementation

The MAX668EUB+ offers superior efficiency and of operation for computing, datacom and telecom applications. It provides a high integration level, and the small footprint eases the layout challenges of high-volume applications.

Conclusion

The MAX668EUB+ is an ultra-fast, high-efficiency and low quiescent current synchronous DC-DC buck application-specific integrated circuit (ASIC). It provides excellent efficiency and a small form factor for a wide range of high-volume power conversion applications. The IC offers superior efficiency and of operation for computing, datacom and telecom applications. It features a voltage-mode control and adaptive on-time PWM/PFM controller and a wide range of control loop dynamics. The asic incorporates various features including high-efficiency, low quiescent current, external slew rate limit control, full-frame synchronization, adjustable soft-start and a synchronous rectifier implementation. It is the ideal choice for space-constrained high-performance systems.

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