LT3742EUF#TRPBF

LT3742EUF#TRPBF Application Field and Working Principle

The LT3742EUF#TRPBF is a high performance monolithic synchronous current mode DC-to-DC step-down switching regulator controller that includes equalized current sharing and internal synchronous rectification control. The LT3742EUF#TRPBF provides a high power solution that can drive multiple series-connected N-Channel MOSFETs while delivering a regulated output current. When combined with an external power stage, LT3742EUF#TRPBF is capable of peak current delivery up to 30A, and can maintain a regulated output current up to 10A. In addition to its high performance capability, the LT3742EUF#TRPBF also offers a wide range of features.

Application Field & Usages:

The LT3742EUF#TRPBF is ideal for various applications, including notebook/ultrabook adapter, USB Type-C chargers, gaming console, server adapters and graphics card adapters. The device incorporates ENABLE, CURRENT LIMIT and POWER GOOD pins to simplify the design process. The device also features an adjustable soft-start to gradually increase output voltage, preventing inrush current.

Key Features and Benefits:

• High power solution capable of supplying up to 30A peak current
• Internal synchronous rectification control for improved efficiency
• Equalized current sharing for multiple devices connected in parallel
• Supports wide range VIN from 4.5V to 36V
• Two internal gate drivers support both high side and low side N-Channel MOSFETs
• Adjustable Soft-Start to prevent inrush current

Working Principle:

The LT3742EUF#TRPBF operates by using current mode switching with a single loop. The device includes an internal oscillator that generates a frequency, ranging from 300kHz to 2MHz, based on the external timing capacitor (CT) and the voltage across the FB pin. The energy from the VIN pin is transferred to the load, controlled by the current that is set by the external RCS resistor. When the output voltage reaches 0.8V, the high-side and the low-side MOSFETs in the power stage turn off, and the diode D1 conducts to discharge the inductor current. The current is sensed by the TS pin and eventually flows into the load. During the next cycle, the MOSFETs are turned on again, the current is increased by the amount of the inductor current, and the loop carries on to the next cycle.

Conclusion:

In conclusion, the LT3742EUF#TRPBF is a high performance current mode synchronous step-down switching regulator controller. It is well-suited for applications such as notebook/ultrabook adapter, USB Type-C chargers, gaming console, server adapters and graphics card adapters. It provides high power capability and features, such as equalized current sharing and adjustable soft-start to simplify the design process. The working principle of the device utilizes current mode switching with a single loop, which improves switching performance and efficiency.