LTC1265IS#TRPBF

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LTC1265IS#TRPBF Application Field and Working Principle

LTC1265IS#TRPBF is a DC-DC switching regulator, designed for a variety of POL (point-of-load) applications. It integrates a complete switching regulator solution into a small 10-pin package with integrated NFET, current limit and short circuit protection, as well as output short-circuit protection.

This DC-DC switching regulator is highly efficient and can provide a variety of output voltages. It includes two dedicated outputs for system power supplies, combined with an integrated output stage, provide a cost-effective solution for many POL applications. The extremely wide operating input voltage range, low dropout voltage, fast transient response and low output voltage ripple makes this a useful device for the most demanding applications.

Characteristic Features of LTC1265IS#TRPBF

LTC1265IS#TRPBF features many unique design characteristics that make it ideal for a wide range of POL applications. Some of the device’s key features and specifications include:

• Wide 4.5V to 20V input voltage range
• 120KHz to 3MHz adjustable switching frequency
• Integrated output stage, current limit, short circuit protection and short-circuit protection
• Low quiescent current, typically under 2mA
• Integrated NFET switch for fast transient response
• Very low dropout voltage operation
• Requires no external output filter for noise reduction

Working Principle of LTC1265IS#TRPBF

The LTC1265IS#TRPBF is a synchronous switching regulator that utilizes a current-mode control to accurately regulate the output voltage. The circuit consists of an internal high-side and low-side N-channel MOSFETs (NFETs) and an internal error amplifier, along with additional circuitry to ensure the outputs are properly regulated. The regulator operates in a fixed-frequency, pulse width modulation (PWM) mode. The adjustable switching frequency, ripple current, peak current limitations and over-current protection on the output are all controlled by the internal PWM controller.

When the output voltage falls below the reference voltage, the error amplifier produces an output signal to increase the duty cycle of the NFET. This closes the NFET and provides a path for current to flow from the input voltage, through the inductor, then to the output to raise the output voltage. Conversely, when the output voltage rises above the reference, the error amplifier decreases the duty cycle of the NFET, opening this path and allowing the output voltage to fall.

The LTC1265IS#TRPBF also contains additional features such as an Under-Voltage Lockout (UVLO) to prevent operation outside of the specified operating voltage range, as well as a thermal protection circuit to prevent catastrophic events resulting in overheating.

Applications of LTC1265IS#TRPBF

The LTC1265IS#TRPBF is suitable for many applications. Its main application areas can be divided in the following categories:

• Portable electronic devices: Mobile phones, compact digital cameras, personal media players, portable game consoles, etc.
• Test and Measurement: In-circuit testers, multi-meters, oscilloscopes, etc.
• Computer Peripherals: Printer and scanner power modules, power adapter modules, etc.
• Consumer Electronics: LCD/LED TV power supplies, power amplifiers, set-top boxes, audio/video players, etc.
• Industrial Automation: Programmable logic controls, robotic arms, industrial thermometers, electric meters, power converters, etc.

Conclusion

The LTC1265IS#TRPBF synchronous switching regulator is a highly efficient device that is suitable for a variety of POL applications. It features a wide operating input voltage range, low dropout voltage, fast transient response, and low output voltage ripple, making it a versatile solution for many applications. Additionally, the device includes an integrated output stage, current limit, short circuit protection, and short-circuit protection, ensuring reliable and safe operation.

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