9FGL0651BKILFT

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As a clock/timing – Application Specific integrated circuit, 9FGL0651BKILFT has a wide application field and excellent working principles. 9FGL0651BKILFT is a synchronous buck controller that has integrated power stage including MOSFETs. It has a regulated output in the threshold of 0.8V-3.6V and the maximum load current is 20A.

The features of 9FGL0651BKILFT include step-down switching regulation at up to 300 kHz, and it allows the output voltage to be adjusted through a single external control voltage which needs to connect to pin CPOS. The external digital-to-analog converter (DAC) provides on-chip calibration of the switching limit, allowing very precise output voltages. The integrated digital dead-time control logic ensures minimum tR/tF periods and efficient thermal performance. Furthermore, 9FGL0651BKILFT provides a pinout that is almost identical to the well established TLV4235 family. This keeps the layout easy for the application.

In terms of specific application fields, the main application of 9FGL0651BKILFT is regulated DC-DC converters for Loads that require high current. It can replace traditional resistor or MOSFET based loops by reducing the total BOM cost and granting precision current regulation. 9FGL0651BKILFT is also suitable for offline converters with Vin as low as 6V as well as high-current PoE applications.

In order to understand the working principles of 9FGL0651BKILFT, it is best to look at the most basic buck DC-DC converter block diagram first: Vin, drain of an n-channel MOSFET and the load are connected to form a buck converter which takes the input voltage Vin and reduces it to a regulated output voltage Vout. Furthermore, 9FGL0651BKILFT features a digitally controlled loop with a fully integrated power stage.

It uses a primary side driven circuit which allows for the use of the smaller feedback loop components. The drain voltage is monitored and is provided to the controller via the Negative Feedback Loop (NFL). The NFL then uses a hysteresis comparator, an op-amp, error amplifier and an external power supply to control the duty cycle of the external MOSFET. The 9FGL0651BKILFT is programmable and allows for the output voltage of the DC-DC converter to be adjusted by a single external control voltage.

Furthermore, 9FGL0651BKILFT also offers an integrated skip function which is triggered when the switching frequency reduces below a certain threshold. This function is designed to reduce power losses during low power conditions, typically a no- load condition. Also, by using a soft start feature, it reduces the inrush current and stabilizes the output voltage quickly when the converter is switched on.

In conclusion, 9FGL0651BKILFT is an integrated circuit that has a wide application field and is suitable for regulated DC-DC converters for loads needing high current. It has an integrated power stage and adequate digital control logic ensuring excellent thermal performance. With its integrated skip function, soft start feature and excellent features, as detailed above, it is clear why 9FGL0651BKILFT is such a popular choice for designing a wide range of DC-DC converters.

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