LV5749V-TLM-E

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The LV5749V-TLM-E is a single-stage DC-DC switching controller with built-in load disconnect and reverse current protection. This device contains a power MOSFET control circuit, a sink driver for external P- and N-channel devices, and onboard loop compensation components all housed in a compact QFN-7 package. The high voltage start-up for this device allows for easy implementation, as well as its wide adjustable output voltage range.

Applications for the LV5749V-TLM-E include DC-DC converters for computer, telecommunications, automotive and industrial applications. This controller can be used to drive synchronous buck converters, providing output voltages ranging from 0.6V to 5.5V. It is robust, has a wide operating temperature range and is suitable for delivering up to 5A of current.

Features

• Built-in load disconnect circuit and reverse current protection
• High voltage startup (from 0 to 55V)
• Wide input voltage range to support 5V, 12V and 24V applications
• P- and N-channel pre-driver for synchronous buck converters
• Output voltage adjustable from 0.6V to 5.5V
• External frequency synchronization possible
• Integrated loop compensation components
• Output current range from 3A to 5A
• Wide operating temperature range from -40°C to +175°C

Working Principle

The LV5749V-TLM-E works on the following principle. Firstly, the input voltage is regulated and averaged by an internal voltage divider and comparator circuit. This voltage is then used to generate an analog voltage, that is proportional to the output voltage. The analog voltage is then compared to an internal reference voltage to generate an error voltage. This error voltage is then converted to a current by a transconductance stage, which is then connected to the switching clock generator. The switching clock generator then generates pulses, to control the gate drive of the external MOSFET switches. The inductor then stores the energy, while the output capacitor filters the load current.

Conclusion

The LV5749V-TLM-E is a single-stage DC-DC switching controller with onboard load disconnect and reverse current protection. It is designed for a wide variety of applications, from computer and telecommunications, to automotive and industrial. It is a robust device, with a wide operating temperature range and output current range from 3A to 5A. The controller applies the basic principles of voltage regulation and load disconnect, to allow for easy implementation and operations in various conditions.

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