MAX1734EUK18+

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The MAX1734EUK18+ is a DC DC switching regulator that offers high efficiency and excellent output current capability. It suits applications from 1.2V input and up to 3.6V output, with a maximum output current of 1.7A. The MAX1734EUK18+ has two operating modes; fixed frequency constant off-time controlled and frequency transient load step pulse-width modulation (PWM).

Overview

The MAX1734EUK18+ is an integrated step-down converter with integrated high-side and low-side power FETs. The device operates at fixed switching frequency, programmable up to 1.2MHz. It can supply up to 1.7A of continuous output current. Moreover, the device provides a low dropout voltage, low quiescent current, and low output voltage ripple. It requires a few external components, such as an inductor, a ceramic output capacitor and compensation components. The MAX1734EUK18+ is available in the SOT23-5 package, and is a complete, simple, cost-effective solution for a variety of portable, battery-operated products.

Features

• Requires few external components
• Three user-selectable current limit levels
• High efficiency in DCM operation
• Current Mode Control
• Adjustable switching frequency
• Output short circuit protection
• Programmable output current limit
• Low dropout at full load
• High ripple rejection
• Up to 1.7A of load current
• Efficient low-power operation

Applications

• Cellular phones
• Digital still cameras
• Bluetooth headsets
• MP3 players
• Portable DVD players
• Docking station for handheld applications
• GPS and PMP players
• Portable medical devices

Working Principle

The MAX1734EUK18+ operates in current mode, with overcurrent protection. It provides the ability to regulate the output voltage at light loads. The device uses an integrated NFET and PFET to switch the input voltage to the output voltage, using an external inductor. At the rising edge of the clock signal, the internal NFET switch is turned on, and the current in the inductor builds up. At the falling edge of the clock, the NFET switch is turned off, and the PFET is switched on. The energy stored in the inductor is transformed through the output capacitor to the output voltage. To prevent an excessive current from the input voltage, the peak inductor current is sensed by the internal current sense resistor. When the current reaches the predetermined maximum set by the user, the device switches to the overcurrent protection mode, reducing the duty cycle to limit the peak current to predetermined values.

In addition, the device features a built-in soft start circuit, providing a slow ramp-up of the output voltage at power-on or after a reset. This circuit limits the inrush current, providing a clean and continuous power-up sequence. The device also features an integrated low-battery detector, which can be used to detect an input undervoltage condition and shut down the regulator before damaging the battery.

Conclusion

The MAX1734EUK18+ DC/DC switching regulator is a versatile, high-efficiency solution for a variety of applications with a low-voltage input and a high-current output. It offers high efficiency, low dropout, low output voltage ripple and protection against overcurrent, output short-circuiting and battery undervoltage. It is suitable for powering a wide range of portable devices, including cellular phones, digital still cameras, Bluetooth headsets, GPS and PMP players, and more.

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