LT1172IN8#PBF

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LT1172IN8#PBF

PMIC - Voltage Regulators - DC DC Switching Regulators

The LT1172IN8#PBF is a monolithic integrated power-supply controller from Linear Technologies. It provides a highly efficient means for regulating the output of DC-DC converters. The device can be used for either positive or negative voltage regulation, as well as for Hot Plug/Soft Start applications. It can operate with input voltages up to ±30 volts, and is available in either P-channel or N-channel configurations.

The LT1172IN8#PBF controller contains an internal oscillator and three control loops that work together to provide a steady output voltage. The device also includes input current limiting and thermal shutdown circuitry, as well as power saving features that make it suitable for many low-power applications. The controller can be used to regulate an output voltage of up to 15 volts, and is capable of delivering up to 6A of current with appropriate external components.

Application of LT1172IN8#PBF

The LT1172IN8#PBF is a versatile and efficient power supply controller, making it suitable for a wide range of applications. It is commonly used in laptop computers and other handheld devices, where its high efficiency allows for extended battery life. Additionally, the device is useful for any application where a precision output voltage is required, such as for memory systems in PCs. The low power requirements of the LT1172IN8#PBF make it ideal for use in automotive applications, where it can be used to provide a reliable and efficient source of power for the system.

In industrial applications, the LT1172IN8#PBF can be used to provide a Constant-Frequency and Constant-Power mode for low noise, low ripple operation. It can also be used in solar charger circuits, as the precision regulation can ensure that the required charge voltage is maintained, even during environmental changes. Other uses include fly-back regulators, SEPIC (single-ended primary-inductor conversion) converters, and other low voltage power supply solutions.

Working Principle of LT1172IN8#PBF

The LT1172IN8#PBF operates by comparing the output voltage to the reference voltage, monitoring the input and output current, and performing pulse-width modulation (PWM) of the main switch. The main PWM loop monitors the output voltage and adjusts the current in the main switch to maintain the required voltage. The synchronous rectifier PWM loop monitors the input current and the synchronized rectifier to ensure that only the necessary current is drawn from the input voltage source. Finally, the current-limit loop monitors the output current and reduces the duty cycle to ensure that the load current stays within its limits.

The LT1172IN8#PBF also contains enabling features, such as soft-start, Hot-Plug protection, and fault detection. These features ensure that the output voltage is brought up gradually, and fault conditions are detected, preventing any damage to the system. The device is also designed to operate in dropout for a wide range of input and output voltages, enabling its use in applications with low input-output ratios.

The LT1172IN8#PBF is a highly efficient power supply controller, offering a convenient solution for low-voltage power regulation. Its wide range of features, such as input current limiting, Hot-Plug protection and synchronous rectification, make it suitable for a wide range of applications. Its low power requirements and ability to operate in dropout make it an ideal solution for small-scale applications, while its precision voltage regulation makes it an excellent choice for applications requiring reliable and accurate outputs.

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