MAX1744EUB

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MAX1744EUB is a high-performance, pin-compatible, 600kHz, step-up DC-DC switching controller. It is part of the family of Voltage Regulators, DC DC Switching Controllers, and is responsible for providing a highly efficient, cost-effective solution for voltage regulation and motor control applications, as well as other low-power applications where a DC/DC converter is required. The MAX1744EUB gives the user the flexibility to adjust the frequency to match specific design needs, as well as providing a wide range of operating temperature, ripple current, and quiescent current options.

Features

• Wide 4.8V to 35V Input Voltage Range
• High-Efficiency (up to 96%) Step-Up DC-DC Switching Controller
• Selectable 560kHz or 700kHz On-Time Adjustable Switching Frequency
• On-Chip 0.2Ω Internal Sense Resistor
• Foldback and Thermally Enhanced Current Limit
• Fast 2A MOSFET Output Driver

Application Field

The MAX1744EUB is ideal for small-sized, low-voltage, power-conversion applications. The controller increases the efficiency of a step-up converter by automatically adjusting the duty cycle for a given load. This controller is compatible with MOSFETs, allowing for a wide selection of output inductors. The MAX1744EUB is well suited for battery-operated applications, automotive, telecom, and hand-held device applications. It is applicable in an array of SMPS applications, including LED lighting, LCD backlighting, portable power supplies, telecommunications and hand-held device markets.

Working Principle

The MAX1744EUB has an operating voltage between 4.8V and 35V. It uses an internally fixed frequency, pulse-width-modulation (PWM) technique to vary the duty cycle of the output. The current limit and the adjustable switching frequency ensure safety, high efficiency, and low electromagnetic interference (EMI). The power converter is based on a synchronous rectification topology referred to as a Buck-Boost Converter. This topology has a low-side inductor, a low-side MOSFET, and a high-side MOSFET. When the high-side switch is OFF and the low-side switch is ON, the voltage across the inductor increases, while the input voltage charges the output capacitors. When both switches are OFF, the inductor dumps energy into the output capacitors to keep the output at a steady voltage.

The switching current limit of the MAX1744EUB is variable and is closely monitored to prevent excessive current levels. The current limit is adjustable via an external resistor and can be set to tolerance of 1%. The MAX1744EUB also features an adjustable slope compensation that ensures stability of the circuit even under varying load conditions. The negative temperature coefficient (NTC) allows the current limit to decrease over time to prevent excessive dissipation in a short circuit or overload situation.

Conclusion

The MAX1744EUB is a high-performance, pin-compatible, 600kHz, step-up DC-DC switching controller. This versatile device offers a wide range of operating temperature, ripple current and quiescent current options and is ideal for small-sized, low-voltage, power conversion applications. With its highly efficient, cost-effective design and adjustable features, the MAX1744EUB will help take your power regulation, motor control, and other low-power applications to a whole new level.

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