LT1245IS8#PBF

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LT1245IS8#PBF application field and working principle

PMIC\'s voltage regulator is a DC/DC switching controller that regulates the output voltage of a switching power supply by controlling the on/off switching of an external power switch. It can also monitor fault conditions and provide protection functions. The LT1245IS8#PBF is typically used in wide range of DC/DC power converters and DC/DC point of load (POL) regulator. The LT1245IS8#PBF is a monolithic high-precision quad-channel DC/DC controller designed for high-efficiency synchronous buck, flyback and SEPIC applications.

Overview

The LT1245IS8#PBF is a high-performance monolithic quadruple-channel dc/dc converter controller. It offers an excellent combination of performance, integration and ease of use. The LT1245IS8#PBF provides four channels of voltage regulation for Point of Load (POL) applications. Each controller includes a 1.25 volt precision reference, a 4-bit DAC, an integrated soft-start circuit, an adjustable frequency PWM oscillator, four independent error amplifiers, four discrete FET drivers, a MOSFET current sensing circuit and support for multiple topology conversions.

Functionality & Features

• Integrated voltage reference: 1.25V, ±2%
• Integrated 4-bit DAC with external adjustable resistors
• Adjustable switching frequency of up to 400kHz
• Accepts 4 independent input channels for controlling multiple outputs
• Four independent error amplifiers
• Four external discrete FET drivers
• Integrated soft-start circuit with external adjustable resistor
• MOSFET current sensing circuit
• Support for boost, flyback, buck, and SEPIC topologies

Applications

The LT1245IS8#PBF is designed to regulate and control the output voltage of DC/DC power converters and point of load (POL) regulators. It is ideal for applications such as gaming consoles, laptops/notebooks, servers, set-top boxes, cell phone base stations, power distribution systems, and other consumer electronics applications. The quad-channel controller can also be used in automotive, industrial, and medical applications.

Working Principle

The LT1245IS8#PBF works by sensing the input voltage and generating a feedback signal to control an integrated MOSFET switch. The feedback signal is compared to the voltage reference, and if necessary, the DAC is adjusted so that the output voltage is regulated to the desired value. The frequency of the oscillator is adjustable depending on the application, and the MOSFET current sensing circuit allows the device to limit the current through the switch. The error amplifiers detect any fault conditions, such as overvoltage or undervoltage, and the soft-start circuit ensures that the output voltage is slowly ramped up to its regulated level.

Conclusion

The LT1245IS8#PBF is a high performance, monolithic, quad-channel dc/dc converter controller designed for a wide range of DC/DC power converters and point of load (POL) regulators. It features a 1.25 volt precision reference, a 4-bit DAC, an adjustable frequency PWM oscillator, four independent error amplifiers, four discrete FET drivers, a MOSFET current sensing circuit and support for multiple topology conversions. The controller is ideal for applications such as gaming consoles, laptops/notebooks, servers, set-top boxes, cell phone base stations, power distribution systems, and other consumer electronics applications.

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