TL7660CDRG4

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The TL7660CDRG4 is a monolithic integrated circuit in a 4-pin SOT-23 package. It is primarily designed for use in high-side, low-side and dual switch step-down DC-to-DC converters. It features excellent thermal stability, soft start, adjustable and user-programmed soft start, excellent power efficiency and frequency response. TL7660CDRG4 also includes overcurrent and thermal protection, overvoltage protection, bidirectional and reverse polarity protection, and a wide range of operating frequencies.

Application Field

The TL7660CDRG4 is suitable for applications such as portable electronic devices, personal computers, LCD TVs and monitors, mobile equipment chargers, LEDs, automotive, and industrial systems. It can reduce the size, cost, and power consumption of DC-DC conversion applications by efficiently converting input power to 3.2V to 35V DC output.

Working Principle

The TL7660CDRG4 uses a high-side, low-side, or dual switch architecture. This architecture features two main components: a P-MOSFET as the main switch and a N-MOSFET as the control switch. When the device is enabled, the control switch biases the gate of the main switch and pulls it to the source voltage, allowing it to conduct the current. This closes the channel between the drain and source terminals, routing it to the output. To keep the output voltage at the desired level, the device provides a feedback connection to monitor the output voltage. The feedback signal is sent to the internal voltage error amplifier, which compares it with the desired output voltage reference. Any difference between the feedback voltage and the reference voltage triggers modulation of the MOSFETs\' gate driving signals. This results in power conversion at the desired output voltage level.

The TL7660CDRG4 is equipped with a slew rate control mechanism and a soft start feature that ensure stable start-up conditions. The slew rate control reduces the frequency of the burst-mode switching, providing stability to the output voltage and reducing EMI radiation. The soft start feature enables a gradual increase in the supply voltage, avoiding inrush current peaks. It also helps protect the load against overvoltage conditions.

The TL7660CDRG4 is well suited for automotive, industrial, and portable applications. The device\'s thermal stability, low-current start-up, thermal and overload protection features, as well as its wide range of adjustable and user-programmable parameters, make it an ideal solution for such applications. Additionally, it can operate at up to 98% efficiency, providing maximal power savings.

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