LM5165YQDGSRQ1

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LM5165YQDGSRQ1, a low power DC-DC switching controller, is designed to operate in the voltage's step-down, step-up, and inverting modes. This device, manufactured by Texas Instruments, is a suitable choice for applications like laptop power adapters, LED drivers, automotive camera systems, point-of-load (POL) power systems, and industrial systems.

Application field

The LM5165YQDGSRQ1 offers two operating modes: discontinuous conduction mode (DCM) and continuous conduction mode (CCM). DCM is suitable for light-load applications and CCM is ideal for high-load and low-tolerance applications. The device can accept a wide input supply voltage ranging from 4.5 V to 36 V, making it an ideal solution for automotive, telecom, industrial, and consumer applications. With an synchronous N-channel MOSFET integrated power switch, the device can achieve a current rating of 10 A and a switching frequency of 250 kHz.

The LM5165YQDGSRQ1 integrates protection features such as overvoltage protection, thermal shutdown, and overcurrent protection, making it suitable for industrial and consumer applications. The adjustable current limit during start-up enables faster charging of the output capacitor, reducing the size and number of bulk capacitor. In addition, the device features an adaptive on-time control to help improve light-load efficiency and reduce the solution size.

Working principle

The LM5165YQDGSRQ1 implements a peak current-mode control, which enables the device to operate at a fixed switching frequency regardless of the load. The device is equipped with an internal oscillator, which operates at a frequency of about 250 kHz. It monitors the current flowing through its integrated MOSFET switch and the output voltage to maintain its accurate output voltage with increased reliability and performance.

The peak current-mode control ensures high efficiency over a wide range of load current due to its constant frequency operation. This enables the device to operate in DCM and CCM efficiently. The IC also features an adaptive on-time control that improves light-load efficiency and reduces the solution size. The adjustable current limit during start-up helps reduce the size and number of bulk capacitors as well.

The device comes with a wide range of protection features such as over-current, thermal shutdown, and over-voltage. These safety features provide protection from short circuits, overloads, and reversed polarity. The device also integrates an enable pin, which can be used to disable the device when it is not in use.

In summary, the LM5165YQDGSRQ1 is a low power DC-DC switching controller. It is a suitable choice for applications such as laptop power adapters, LED drivers, automotive camera systems, point-of-load (POL) power systems, and industrial systems. With an integrated N-channel MOSFET power switch, it is capable of achieving a current rating of up to 10 A and a switching frequency of 250 kHz. An adaptive on-time control ensures improved light-load efficiency while protection features such as overvoltage and overcurrent protection, thermal shutdown, and enable pins provide added safety to the system.

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