LTC3811EUHF#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High Efficiency - Wide Input Voltage Range - Synchronous Buck Controller - Constant Frequency Current Mode Control - Adjustable Output Voltage - Programmable Soft-Start - Overvoltage Protection - Undervoltage Lockout - Thermal Shutdown

Package: QFN-38

Essence: The LTC3811EUHF#TRPBF is a high-performance synchronous buck controller IC used in power management applications. It offers high efficiency, wide input voltage range, and various protection features.

Packaging/Quantity: The LTC3811EUHF#TRPBF is available in a QFN-38 package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 4.5V to 60V
• Output Voltage Range: 0.6V to VIN
• Switching Frequency: Up to 1MHz
• Maximum Duty Cycle: 90%
• Operating Temperature Range: -40°C to 125°C
• Quiescent Current: 100µA

Pin Configuration

The LTC3811EUHF#TRPBF has a total of 38 pins. The pin configuration is as follows:

1. VCC
2. GND
3. FB
4. COMP
5. SS/TR/UVLO
6. SYNC/MODE
7. CLKOUT
8. CLKIN
9. PGND
10. BOOT
11. SW
12. SW
13. SW
14. SW
15. SW
16. SW
17. SW
18. SW
19. SW
20. SW
21. SW
22. SW
23. SW
24. SW
25. SW
26. SW
27. SW
28. SW
29. SW
30. SW
31. SW
32. SW
33. SW
34. SW
35. SW
36. SW
37. SW
38. SW

Functional Features

1. High Efficiency: The LTC3811EUHF#TRPBF offers high efficiency, minimizing power losses and maximizing energy conversion.
2. Wide Input Voltage Range: It can handle input voltages ranging from 4.5V to 60V, making it suitable for a wide range of applications.
3. Synchronous Buck Controller: The IC operates as a synchronous buck controller, providing efficient step-down voltage conversion.
4. Constant Frequency Current Mode Control: It utilizes constant frequency current mode control for stable and reliable operation.
5. Adjustable Output Voltage: The output voltage can be adjusted according to the application requirements.
6. Programmable Soft-Start: The soft-start feature allows for controlled startup, reducing inrush currents and improving system reliability.
7. Overvoltage Protection: The IC incorporates overvoltage protection to safeguard against excessive voltage levels.
8. Undervoltage Lockout: It includes undervoltage lockout functionality to prevent operation below specified voltage thresholds.
9. Thermal Shutdown: The IC features thermal shutdown protection, preventing damage due to excessive temperature.

Advantages and Disadvantages

Advantages: - High efficiency leads to reduced power consumption. - Wide input voltage range enables versatile applications. - Constant frequency current mode control ensures stability. - Adjustable output voltage provides flexibility. - Protection features enhance system reliability.

Disadvantages: - Limited pin configuration options may restrict certain circuit designs. - Requires careful consideration of thermal management due to high power dissipation.

Working Principles

The LTC3811EUHF#TRPBF operates as a synchronous buck controller, converting a higher input voltage to a lower output voltage. It utilizes a constant frequency current mode control scheme to regulate the output voltage. The IC adjusts the duty cycle of the switching transistor to maintain the desired output voltage.

During operation, the input voltage is applied to the SW pin, and the output voltage is sensed through the FB pin. The COMP pin provides feedback to the control circuitry, which adjusts the duty cycle accordingly. The CLKIN pin allows synchronization with an external clock signal if required.

The LTC3811EUHF#TRPBF incorporates various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown. These safeguards ensure the safe and reliable operation of the power management system.

Detailed Application Field Plans

The LTC3811EUHF#TRPBF is widely used in various power management applications, including but not limited to: - Industrial equipment - Automotive systems - Telecommunications infrastructure - Data centers - Renewable energy systems - Consumer electronics

Its high efficiency, wide input voltage range, and protection features make it suitable for diverse applications where efficient power