NDTD0503C

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Today’s rapidly increasing electronics industry requires reliable, efficient, and high performance products to satisfy ever increasing demands for smaller, lighter, and longer lasting power platforms. DC-DC converters are one of the essential tools for engineers to satisfy these demands. The NDTD0503C is an example of one such DC-DC converter, a 5A, 0.5V to 3.3V Buck converter with low quiescent current and operating frequency.

Application Field

The NDTD0503C is suitable for a wide range of applications such as industrial, wireless communication, medical equipment, Wearable Devices, Battery Charging and Automotive Systems etc. It can also be used in power supplies for general purpose electronics such as microcontrollers, DSPs, and FPGAs. It is capable of delivering high currents with a high efficiency while keeping a low profile in terms of size and weight.

Working Principle

The NDTD0503C utilizes a synchronous buck conversion topology, where a two-switch circuit is used to regulate the output voltage. The two switches are controlled by Pulse Width Modulation (PWM). As the PWM increases, the duty cycle of the switches increases, and consequently more energy is transferred to the output. The high frequency operation, combined with an advanced LLC resonant circuit, helps to minimize the size of the external components and reduce the power losses across the converter. When coupled with an external inductor, the converter is able to rapidly and efficiently convert the DC input voltage to the desired output voltage.

The NDTD0503C supports a wide-input voltage range, allowing it to effectively step-down voltages from 0.5V to 3.3V and provides a 5A output current with a conversion efficiency of up to 96%. An integrated Power Good (PG) signal output is available to allow the device to monitor the output voltage, and an adjustable over-current protection (OCP) is provided to ensure the reliability of the system.

Another key feature of the NDTD0503C is its low quiescent current. It can operate in either PWM mode or pulse-skip mode. In PWM mode the device will continuously resume PWM operation after a soft start following a power-on or power-off event. In pulse-skip mode, the device will cycle through PWM mode and low-power skip mode where it will only switch on the output for a short period to check that the output current has not exceeded the preset protection limit. The device can thus remain in low-power mode for a much longer period of time and consume much less power than when operating in PWM mode.

Overall, the NDTD0503C is an excellent device that is suitable for a wide range of applications. It can take a low input voltage and reliably and efficiently convert it to a more usable output voltage without consuming excessive amounts of power. It has superior protection features and a low quiescent current, which is perfect for use in portable devices where power consumption is paramount.

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