LM34914SD Integrated Circuits (ICs)

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LM34914SD is a synchronous step-down DC/DC converter in a 4mm x 4mm HSOP-16 package (size-16). This is an advanced design with all the typical features of modern DC/DC converters, such as short-circuit, over-temperature, over-voltage and under-voltage protection. It is designed to step down voltage from 5-30V_DC to 0.6-5V_DC, making it suitable for a range of application fields.

Application Field

The LM34914SD is designed for applications that require high efficiency and accuracy, especially when multiple voltage rails are required. It can be used in many fields including consumer electronics, motor drives, mobile equipment, computing and communications systems, instrumentation, computer peripherals, and automotive. Additionally, it can be used in distributed power systems, battery-powered and power over Ethernet (PoE) systems.

Working Principle

The LM34914SD is a synchronous, integrated buck regulator. Its basic operation is to draw input current, store it in an internal inductor, and release it as output current. During the discharge phase, the current stored in the inductor is converted to output current. During the charge phase, current is readdressed into the inductor again. The output voltage is controlled by adjusting the duty cycle of the internal high-side switch.

The LM34914SD switch is controlled by an internal current mode, constant on-time (COT) controller. This feature helps reduce electromagnetic interference (EMI) disturbances as the output current is kept at a constant level. Additionally, the switch current limit is 3.2A, allowing for higher power conversions. The output voltage is monitored by an internal voltage divider, which provides good accuracy in voltage regulation.

The LM34914SD also utilizes an internal power MOSFET which provides both high efficiency and low noise operation. The switching frequency is selectable and can be set between 200KHz and 2MHz depending on the application. This feature provides further flexibility in order to tailor the LM34914SD’s performance to the user’s specific application.

Conclusion

The LM34914SD is a synchronous step-down DC/DC converter with many features in a small package. It is designed to step down voltage from 5-30V_DC to 0.6-5V_DC, suitable for a wide range of application fields. It has an internal switching frequency that can be adjusted to tailor the performance for specific application. The LM34914SD also has an internal power MOSFET which provides both high efficiency and low noise operation. The internal COT controller also helps reduce EMI disturbances. In conclusion, the LM34914SD is an ideal choice for applications that require high efficiency and accuracy.

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