MAX1649CPA

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The MAX1649CPA is an integrated DC-DC switching controller containing circuitry necessary to generate highfrequency, fixed-frequency, and fixed-duty-cycle pulses to drive an external transistor power switch. The device drives an N-channel MOSFET with a pulse width modulated (PWM) signal tailored for synchronous buck converter applications. The PWM frequency is programmable up to 750kHz, which allows the use of small external components in a wide variety of power supply configurations. Its feature set, high-accuracy current limit, high frequency operation with low-power noise and flexible features, make the MAX1649CPA an attractive choice for both synchronous and non-synchronous buck converter designs.

Application Field

The MAX1649CPA can be used in a wide range of applications that require tight regulation, high efficiency, and small-sized components. The device is ideal for power supplies in computer systems, servers, communication equipment, audio/video systems, automotive components, industrial and medical equipment, and other professional equipment. The wide current and voltage range, small external components, and low power dissipation make it suitable for a wide range of applications as well.

Working Principle

The MAX1649CPA is a pulse width modulation (PWM) controller that utilizes an external N-Channel MOSFET switch to regulate the output voltage. The device monitors the load current and output voltage along with an adjustable voltage reference signal to control the MOSFET switch. When the load current and output voltage fall below the programmed threshold, the device automatically triggers a high-frequency PWM signal to activate the MOSFET switch, drawing current from the input side. When the load current and output voltage rise above the programmed thresholds, the device triggers a low-frequency PWM signal to shut off the MOSFET switch, drawing current to the opposite side. This process of switching rapidly between high- and low-frequency PWM signals is the basic principle for achieving a stable, regulated output voltage.

The MAX1649CPA features an adjustable PWM frequency of up to 750kHz, adjustable maximum switch (ON-time) duty cycle, and individual charge pump voltage split for fast rise and fall times. The device also features an adjustable soft-start and over-voltage protection for safeguarding the load from input power transient spikes. In addition, the device features a power-good output signal (PGOOD) to indicate the status of the output voltage. The MAX1649CPA is available in the 8-pin SOIC-8 package, making it a popular choice for space-constrained applications.

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