LM3691TL-0.75/NOPB

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The LM3691TL-0.75/NOPB is a DC-DC buck controller designed to facilitate the development of complex, highly efficient and precise DC-DC converter solutions. The device is rated to handle up to 600 mA of output current, with an output voltage of 0.75V. The device includes a built-in current-mode controller, error amplifier, and a thermal overload protection circuitry. The LM3691TL-0.75/NOPB also includes an adjustable under-voltage lockout, over-voltage protection, over-current protection, as well as a fixed soft-start timing.

Application

The LM3691TL-0.75/NOPB is primarily designed to be used in a wide range of DC-DC buck applications. These applications include those found in industrial control systems, portable electronic devices, embedded systems, and consumer electronics. The device can be found in applications such as notebook computer power supplies, mobile phone chargers, DC-DC adapters, and battery management systems for notebook computers, cell phones and portable devices.

Function & Working Principle

The LM3691TL-0.75/NOPB is a current-mode buck controller that is operated by a fixed frequency clock. The device integrates a PWM that regulates the output voltage by controlling the duty cycle of the PWM signal generated. The device also integrates an adjustable soft-start/over-temperature protection circuitry that helps to reduce output ripple and prolong the lifetime of the device. In addition, the device features an adjustable UVLO, OVP, OCP, and thermal shutdown that helps to protect the device and its surroundings from excessive current and heat.

The working principle of the LM3691TL-0.75/NOPB is to use the signal developed by the voltage loop error amplifier and the current sense amplifier in order to detect changes in the output voltage and current. When a change is detected, the controller then sends out a PWM signal that regulates the output voltage and current, so as to keep them in a fixed range. This signal is used to generate a pulse width modulation (PWM) to control the output voltage and current over time. The PWM frequency can be adjusted from 500 kHz to 2.5 MHz and is synchronized with the internal oscillator. The device also includes an adjustable current limit for the inductor and an adjustable soft-start for the output voltage.

Conclusion

The LM3691TL-0.75/NOPB is a high-performance DC-DC buck controller designed to meet the needs of a wide range of DC-DC switching applications. The device integrates a current-mode PWM controller, along with adjustable UVLO, OVP, and OCP protection features that help to keep the device and its surrounding safe from excessive current and heat. The device also features a fixed soft-start and a wide range of adjustable PWM frequency settings, which provides the user with a highly flexible and tailored solution for their DC-DC buck solution.

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