LM2676SDX-3.3/NOPB Integrated Circuits (ICs)

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LM2676SDX-3.3/NOPB is a switching regulator IC from Texas Instruments. It is a member of the company\'s LM2676 Simple Switcher family, and it is designed for applications that require up to 3.3V of power conversion. This article will discuss the application field and working principle of the LM2676SDX-3.3/NOPB.

Application Field

The LM2676SDX-3.3/NOPB is typically used in a wide range of mobile and handheld devices, including cell phones, navigation systems, portable media players, PDAs, and medical devices. The device can also be used in a variety of other applications, such as instrumentation, heating, lighting, and power supplies.

The device is well-suited for low power, step-down applications that require up to 3.3V of output power conversion. The device can also be used in multiple output applications, as it can be configured to operate as either a single-output or multi-output regulator. In addition, the device is well-suited for data path and digital power applications, as it is capable of providing low output voltage drift and fast transient response. The device is also optimized for inductor-based DC/DC converters, providing high efficiency and high power output.

Working Principle

The LM2676SDX-3.3/NOPB operates as a step-down regulator, transforming input voltages of up to 24V down to 3.3V. The device is capable of providing up to 2A of current, with a minimum switch on-time of 43ns. The device also features a built-in frequency doubler, allowing it to operate at twice the switching frequency of the normal mode. This allows the device to offer improved transient response and reduced noise.

The device contains a Pulse Width Modulation (PWM) control circuit and a switch network. The PWM control circuit takes input from a voltage divider network and compares it to reference voltage of 3.3V from a reference terminal. The output from the comparator is passed to the switch network, which drives a high isostatic N-MOSFET connected to ground. The N-MOSFET then transforms the output voltage to the desired level.

The device also includes current limit and thermal shutdown circuitry for safety and protection. The current limit comparator monitors the sense resistor and trips the device off if the current limit is exceeded. The thermal shutdown is triggered whenever the temperature of the device reaches a certain level.

Conclusion

The LM2676SDX-3.3/NOPB is a versatile switching regulator IC from Texas Instruments. It is designed for applications that require up to 3.3V of power conversion. The device is well-suited for a variety of applications, including those in the mobile, portable, and medical fields. It operates as a step-down regulator, transforming input voltages of up to 24V down to 3.3V. The device contains a PWM control circuit, a switch network, and safety and protection circuitry. This article discussed the application field and working principle of the LM2676SDX-3.3/NOPB.

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