MAX797CSE

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The MAX797CSE is a highly integrated, pulse-width modulator (PWM) controller that is used to generate multiple low-voltage power supply rails. The device operates in fixed-frequency current mode to ensure a well-regulated output voltage over a wide line and load range. The PWM frequency is factory-test optimized for minimum EMI/RFI and provides a fast transient response for applications requiring sudden changes to the input or output power levels.

The MAX797CSE features an internal 2.5V reference and regulation loop accuracy of 0.5%, along with a power-on reset (POR) circuit and undervoltage lockout (UVLO) feature to improve system reliability. The device also includes an on-chip temperature sensor and foldback current-limit circuit, which allows the ability to survive current transients up to 6x the normal set current limit. It is also fully protected from current output overloading, undervoltage and overvoltage, overtemperature, and voltage spikes.

The key features of the MAX797CSE include:

• Maximum duty cycle of 100%
• High-frequency fixed-frequency operation from 50 kHz to 500 kHz
• Synchronous or nonsynchronous rectification
• Integrated foldback current limit for robust operation
• Internal 2.5V regulator with 0.5% accuracy
• Undervoltage lockout with adjustable thresholds
• Power-on reset circuit

The MAX797CSE is well-suited for any application requiring a low-voltage, precision-controlled PWM controller. Typical applications include:

• Notebook and desktop computers
• Set-top boxes
• LCD/LED display monitors and TVs
• Game consoles

The MAX797CSE operates in a switched-mode control scheme, which is essentially a digitally controlled analog loop. The controller converts an analog input voltage into a digital form, and the output voltage is dependent on the PWM duty cycle and the on-time of the switch. The controller then compares the feedback voltage to the set point to adjust the duty cycle and on-time of the switch to stabilize the output voltage.

As can be seen from the features listed above, the MAX797CSE provides a powerful and reliable solution for generating low-voltage power supply rails. The device is easy to implement and provides excellent regulation accuracy and performance. The device\'s integrated protection and foldback current limit provide robustness, and the PWM frequency ensures low EMI/RFI levels. The MAX797CSE is an ideal choice for any application requiring a low-voltage PWM controller.

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