LM5150QRUMRQ1

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The LM5150QRUMRQ1 is an easily programmable, high-efficiency, high-current DC/DC synchronous buck controller. It employs an advanced control technique to optimize the system size and cost. The LM5150QRUMRQ1 integrates a Pulse Width Modulated (PWM) control circuit, a voltage reference, an error amplifier, and an oscillator as well as other control, logic, and protection circuitry. All of these features make the LM5150QRUMRQ1 an ideal choice for applications where efficiency, robustness, size, and economy are paramount.

Application Field

The LM5150QRUMRQ1 can be used to regulate the output voltage of converters with output currents up to 50A and voltages ranging from 0.75 to 5.5 V. This device is suitable for applications such as notebook computer, power supply and solid state drives, etc. It also provides integrated Soft-Start, Foldback-OVP, Enable, Thermal Monitor, and Adaptive Current Limit for improved system reliability.

Working Principle

The synchronous buck converter is often used for delivering a relatively lower voltage than the input voltage. A controller, in the form of USB dropout voltage regulator, manages the input voltage and limits the output current in the converter. The LM5150QRUMRQ1 is organized as a voltage mode control synchronous buck controller. It employs advanced active loop control, which is optimized to provide high efficiency without compromising transient response.

At the start of each cycle, the device first takes the power switch, S1, off. The device then monitors the feedback voltage and compares it to the internal reference voltage. It then compares the difference between the feedback voltage and the internal reference voltage to the predetermined error limit and takes appropriate action. If the difference is within the error limit, the controller will increase or decrease the duty cycle of the S1 accordingly. The duty cycle of the converter determines the input current and output voltage.

The cycle repeats as long as the device is enabled and the input voltage is adequate. The device also provides protective functions such as over-temperature protection and over-voltage protection to ensure safe operation. The device also provides a built-in soft start feature to allow for a smooth transition from disabled to enabled mode.

In summary, the LM5150QRUMRQ1 is an ideal DC/DC switching controller for applications that require high efficiency, robustness, size, and price. It is capable of regulating output voltages ranging from 0.75 to 5.5V and current up to 50A. The device features advanced protection and control features, providing reliable operation over wide range of temperatures and input/output voltages.

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