LM2670S-3.3/NOPB

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The LM2670S-3.3/NOPB is a high efficiency step-down switching regulator, designed for mobile applications and evaluation boards. It features a fast on-time response, a wide input voltage range, and adjustable output voltage. The fast switching device reduces the amount of power losses and increases the efficiency of the power supply. The device allows for a wide operating input voltage range from 4.5V to 24V, and offers adjustable output voltage from 3.3V to 5V. The buck converter can be enabled or disabled using the on/off and undervoltage lock out functions for various applications.

The LM2670S-3.3/NOPB is based on a buck topology and contains the necessary circuitry for active switching and synchronous rectification to improve efficiency. The device also includes protection features such as cycle-by-cycle current limit and thermal shutdown to ensure safe operation. It is optimized for applications with high output current requirements, such as LCD displays and other mobile applications. The LM2670S-3.3/NOPB offers high efficiency over a wide load current range with adjustable duty cycle and fast transient response, providing a low noise power solution for a variety of mobile applications.

Applications

The LM2670S-3.3/NOPB is well suited for a variety of mobile applications, such as:

• Energy storage systems
• Portable electronics
• LCD displays
• Wireless power supply
• Telecommunications equipment

Working Principle

The LM2670S-3.3/NOPB operates in a buck topology with two external switches and two external power MOSFETs. The internal clock oscillator is used to control the switching frequency, the duty cycle and the voltage transition times. The transition times can be programmed with an external capacitor to match the application\'s switching profile. The high side and low side drivers are used to control the active MOSFET switches. The input voltage is supplied to the non-inverting input and the feedback voltage is connected to the inverting input. The feedback voltage is compared to the 1.25V internal reference voltage and error is amplified by the error amplifier.

The error signal is passed to the PWM comparator and its output is used to enable or disable the switches. The error amplifier is used for regulation and loop compensation. The voltage can be adjusted using an external resistor divider. The output voltage is sensed using an internal current mirror to provide feedback to the error amplifier. The output voltage is regulated by controlling the on time of the switches and the ripple voltage is reduced by proper selection of the output capacitor value.

Conclusion

The LM2670S-3.3/NOPB is a high efficiency step-down switching regulator designed for mobile applications and evaluation boards. The device allows for a wide operating input voltage range from 4.5V to 24V, and offers adjustable output voltage from 3.3V to 5V. The buck converter is optimized for applications with high output current requirements, such as LCD displays and other mobile applications. The internal clock oscillator is used to control the switching frequency, the duty cycle and the voltage transition times. The LM2670S-3.3/NOPB offers high efficiency over a wide load current range with adjustable duty cycle and fast transient response, providing a low noise power solution for a variety of mobile applications.

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