LM2676S-3.3

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The LM2676S-3.3 is an easy-to-use, high performance, monolithic switching regulator controller. It is designed to provide a regulated output voltage up to 3.3V with a maximum output current of 500mV. This device is ideal for a wide range of applications, including mobile phones, personal digital assistants (PDAs), digital still cameras, notebook computers, and tablet PCs.

This regulator has advanced features that make it ideal for high current applications. It includes auto-power control, low standby current and frequency foldback, which allow the device to reliably provide high current and temperature stability. Additionally, the LM2676S-3.3 has adjustable soft-start/soft-stop, current-limit, and thermal shutdown features to protect the device from voltage and current spikes, and to ensure system integrity.

The LM2676S-3.3 operates using a switching regulator topology that incorporates a pulse-width modulation (PWM) controlled on-off switch. This switch connects the regulated output voltage across an inductor, while the control logic determines when to turn the switch on and off. As the switch is cycled, the inductor stores energy in the form of a magnetic field that ultimately provides the regulated output voltage.

The voltage of the regulated output is maintained by the LM2676S-3.3 through a feedback circuit, which compares the actual output voltage to a fixed reference voltage and adjusts the duty cycle of the PWM switch accordingly. The control logic also monitors the output current and enables and disables the PWM based on the load current. This ensures that the regulated output does not overload or short-circuit.

In addition, the soft-start/soft-stop functions of the LM2676S-3.3 reduce voltage transients for shorter and safer system start-up. By ramping up the PWM duty cycle, the soft-start limits the inrush current, while the soft-stop ramps down the PWM duty cycle to reduce the voltage transients. This protects the system from over-voltage and under-voltage conditions.

Overall, the LM2676S-3.3 offers a simple, but reliable and efficient power solution for a variety of DC/DC converter applications. It provides an adjustable regulated output voltage up to 3.3V, with a maximum output current of 500 mV, and advanced features such as frequency foldback, auto-power control, and soft-start/soft-stop. These features, along with its robust protection scheme, make the LM2676S-3.3 an ideal choice for any high current application.

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