LM2576-3.3WT

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The LM2576-3.3WT is a step-down switching regulator, commonly referred to as a switching buck regulator, used to convert an input DC voltage to a lower regulated output voltage. It is part of the Voltage Regulators DC DC Switching Regulators family. LM2576-3.3WT offers the combination of an inductor, rectifier and power transistor to provide a regulated output from an unregulated source.

Features:

• Operates from an input voltage of from 5V to 35V
• Wide input voltage range of 6V to 40V
• Current mode control for excellent line and load regulation
• High efficiency up to 91%
• Adjustable output voltage from 0.8V to V IN
• Short-circuit protection
• TTL shutdown capability
• High step-up ratios of up to 150:1

Block Diagram:

Application Fields of LM2576-3.3WT:

LM2576-3.3WT is mainly used for low-power, low-voltage applications, such as:

• Power supplies for personal electronics
• Battery-powered applications
• High-speed data converters
• Low noise power supplies
• Remote sensing systems
• Battery chargers
• LED backlights
• RF power amplifiers

Working Principle of LM2576-3.3WT:

LM2576-3.3WT is a switching regulator, and the step-down voltage regulator, switching the input voltage to a lower regulated output voltage. It works by taking the input voltage, applying a square wave to the input, charging an inductor with the square wave, then when the inductor is charged, the supply is disconnected, and the inductor discharges into the load. This process repeats and leads to a regulated output voltage.

It works based on current mode control topology, where the switching transistors are current-senses, protected, and feature temperature compensation to ensure an accurate reference voltage. Moreover, this IC features soft-start to prevent over-shoots at turn on, an adjustable loop-gain amplifier to adjust over current and short-circuit protection, and an adjustable reference voltage, to ensure that it works with input voltages from 6V to 40V to deliver a regulated output voltage from 0.8V to VIN.

LM2576-3.3WT also operates at a high frequency, generally between 200kHz and 2MHz, which increases efficiency and reduces component count. The high-speed operation of the IC also reduces electromagnetic interference, which is important for operation in an RF environment.

Conclusion:

LM2576-3.3WT is a versatile switching regulator for many low-power, low-voltage applications. The current mode control provides excellent line and load regulation, and its adjustable voltage and switching frequency make it suitable for a wide range of applications.

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