MAX1775EEE

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MAX1775EEE is a high-efficiency, fixed-frequency, step-up DC-DC switching regulator controller IC, which belongs to the family of DC-DC switching controllers, voltage regulators and PMICs (power management integrated circuits). The controller IC integrates various analog and digital functional blocks and control functions and is suitable for a wide range of battery-powered applications, such as MP3 players, PDAs and mobile phones.

The IC can generate an output voltage up to 5V under low input voltages as low as 0.7V. Its advanced auto-skip mode allows the controller to deliver 1mA output on outputs up to 4V with very low input voltages. The very low quiescent current of around 3μA (typical) helps extend battery life.

The MAX1775EEE controller IC features an internal PWM comparator and regulator for high efficiency and fast response time. Its features also include programmable current limit, adjustable soft-start, peak current-limit, feedback line-compensation, and an over-temperature circuit that protects the IC from thermal overload.

In applications where output voltages up to 5V need to be generated, the IC uses a step-up (also known as boost) DC-DC converter topology. The IC operates at a fixed frequency ranging between 300kHz and 500kHz. During each switching cycle the switch is opened when the inductor current reaches a certain limit set by the current limit resistor. After that, the inductor energy is transferred to the output capacitor. During every cycle a portion of the energy stored in the inductor is lost through switching and parasitic losses.

The feedback circuit is used to maintain a constant output voltage by comparing the voltage at the feedback input (REF pin) with an internal reference voltage. When the output voltage is lower than the reference, the PWM comparator enables the switching circuit, and the output voltage ramps up. When the output voltage is higher than the reference voltage, the PWM comparator switches off the switch and regulation stops, allowing the switch to rest until the next cycle.

The IC also integrates a soft-start circuit which prevents inrush current when the input voltage is applied. The soft-start rate is programmable by connecting an external capacitor between the SOFT pin and the ground pin.

The peak current-limit circuit is also integrated. It prevents excessive current from flowing through the inductor during initial start-up or an output short circuit event. The peak current limit value is set by an external resistor connected between the CLIMIT pin and the ground pin.

The MAX1775EEE offers an improved solution for generating an output voltage up to 5V from a very low input voltage, in a variety of applications. Its advanced features like its auto-skip mode, programmable soft-start, peak current-limit, and line-compensation enable it to deliver reliable, accurate and efficient performance.

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