LT3743EUFD#PBF

Product Overview

Category

LT3743EUFD#PBF belongs to the category of integrated circuits (ICs).

Use

The LT3743EUFD#PBF is primarily used as a high voltage synchronous step-down DC/DC controller.

Characteristics

• High voltage input range: The LT3743EUFD#PBF can handle input voltages ranging from 4.5V to 100V.
• Synchronous rectification: It utilizes synchronous rectification to improve efficiency.
• Adjustable frequency: The switching frequency can be adjusted between 100kHz and 1MHz.
• Fault protection: The IC provides various fault protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown.

Package

LT3743EUFD#PBF is available in a 28-lead 4mm x 5mm QFN package.

Essence

The essence of LT3743EUFD#PBF lies in its ability to efficiently regulate high voltage inputs to lower output voltages, making it suitable for a wide range of applications.

Packaging/Quantity

The LT3743EUFD#PBF is typically sold in reels containing 250 units per reel.

Specifications

• Input Voltage Range: 4.5V to 100V
• Output Voltage Range: 0.8V to VIN
• Switching Frequency Range: 100kHz to 1MHz
• Maximum Duty Cycle: 90%
• Operating Temperature Range: -40°C to 125°C
• Package Type: 28-Lead 4mm x 5mm QFN

Detailed Pin Configuration

1. VIN: Input voltage pin
2. PGND: Power ground pin
3. SW: Switch node connection pin
4. FB: Feedback voltage pin
5. COMP: Compensation pin
6. SS: Soft-start pin
7. RT/CLKOUT: Resistor timing or clock output pin
8. SYNC/MODE: Synchronization or mode selection pin
9. VCC: Supply voltage pin
10. GND: Ground pin

Functional Features

• High efficiency synchronous rectification
• Adjustable switching frequency
• Programmable soft-start
• Current mode control for improved stability and transient response
• Fault protection features (overvoltage, undervoltage, thermal shutdown)

Advantages and Disadvantages

Advantages

• Wide input voltage range allows for versatile applications
• High efficiency operation reduces power dissipation
• Fault protection features enhance system reliability
• Adjustable switching frequency provides flexibility in design

Disadvantages

• Limited maximum duty cycle may restrict certain applications
• Requires external components for complete functionality
• Relatively small package size may pose challenges during assembly

Working Principles

The LT3743EUFD#PBF operates as a synchronous step-down DC/DC controller. It regulates the output voltage by controlling the duty cycle of the internal power switches. The feedback voltage is compared to a reference voltage, and the controller adjusts the duty cycle accordingly to maintain the desired output voltage. Synchronous rectification improves efficiency by reducing power losses.

Detailed Application Field Plans

The LT3743EUFD#PBF finds applications in various fields, including but not limited to: - Automotive electronics - Industrial automation - Telecommunications - Power distribution systems - LED lighting - Battery charging systems

Detailed and Complete Alternative Models

1. LT3743EFE#PBF: Similar to LT3743EUFD#PBF, but available in a 28-lead TSSOP package.
2. LT3743EMSE#PBF: Similar to LT3743EUFD#PBF, but available in a 16-lead MSOP package.
3. LT3743HMSE#PBF: Similar to LT3743EUFD#PBF, but designed for high temperature operation.

These alternative models offer similar functionality and features as the LT3743EUFD#PBF, but with different package options to suit specific design requirements.

In conclusion, the LT3743EUFD#PBF is a versatile high voltage synchronous step-down DC/DC controller. Its wide input voltage range, adjustable switching frequency, and fault protection features make it suitable for various applications in automotive, industrial, and power distribution systems. While it has certain limitations, such as a limited maximum duty cycle and external component requirements, the advantages outweigh the disadvantages, making it a reliable choice for efficient power regulation.