LM76003QRNPTQ1

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The LM76003QRNPTQ1 is a Low-Ripple, Constant On-Time (COT) DC-DC Buck switching regulator designed for high efficiency, low noise, and low output voltage ripple. The device has an input voltage range from 4.5V to 24V and an output voltage range from 0.99V to 6V. It provides a wide range of output current options, including up to 3A with a maximum voltage drop of 1.2V. The device is rated for a maximum junction temperature of +125°C and operates over a junction temperature range of -40 to +125°C.

The LM76003QRNPTQ1 is a fully integrated switching regulator which requires few external components. Its Constant On-Time architecture ensures fast transient response and low output voltage ripple, which helps minimize external component size. Its wide input and output voltage ranges, low quiescent current, and high efficiency make it well suited for many automotive and industrial applications.

Working Principle

The LM76003QRNPTQ1 is a constant on-time DC-DC buck regulator that employs peak current mode control architecture. The device compares the feedback voltage of the output with a reference voltage and adjusts the duty cycle of the pulse-width modulation (PWM) signal accordingly. The rise and fall times of the PWM signal are determined by the maximum switching frequency specified by the user. The PWM signal is then applied to the gate of the external power MOSFET and the device operates in discontinuous-mode.

The device constantly monitors the output voltage and ensures that the voltage remains constant. The device automatically adjusts the switch-on and switch-off times of the external MOSFET according to the load current and output voltage. The device also has short-circuit protection, which prevents the device from shutting down when there is a short-circuit situation at the output.

Application Field

The LM76003QRNPTQ1 is a highly efficient and low noise DC-DC buck switching regulator. Due to its wide input voltage range and high efficiency, it can be used in a variety of automotive and industrial applications. In automotive applications, it can be used in car audio systems, power seats, and electric steering systems. In industrial applications it can be used as a low noise power supply for embedded computer systems, microprocessors and programmable logic controllers.

The device also provides various features such as adjustable output voltage, over current protection, and thermal shutdown. These features make the LM76003QRNPTQ1 an ideal choice for automotive and industrial applications that require high efficiency and low noise power supplies.

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