LT3756IUD-1#PBF

Product Overview

Category

The LT3756IUD-1#PBF belongs to the category of integrated circuits (ICs).

Use

This IC is commonly used in power management applications.

Characteristics

• The LT3756IUD-1#PBF is a high voltage, current mode DC/DC controller.
• It operates over a wide input voltage range and can regulate output voltages up to 100V.
• This IC is designed for driving external N-channel MOSFETs in boost, buck, or buck-boost configurations.
• It offers a variety of protection features such as input and output overvoltage protection, thermal shutdown, and programmable soft-start.

Package

The LT3756IUD-1#PBF is available in a 16-lead QFN package.

Essence

The essence of the LT3756IUD-1#PBF is its ability to efficiently control and regulate high voltage power conversion.

Packaging/Quantity

This IC is typically sold in reels or tubes, with a quantity of 250 units per reel/tube.

Specifications

• Input Voltage Range: 3V to 40V
• Output Voltage Range: Up to 100V
• Switching Frequency: Adjustable up to 1MHz
• Maximum Duty Cycle: 99%
• Operating Temperature Range: -40°C to 125°C
• Package Type: 16-Lead QFN

Detailed Pin Configuration

The LT3756IUD-1#PBF has the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. FB: Feedback pin for regulating the output voltage
4. SS/TR: Soft-start/Tracking pin
5. VCC: Supply voltage for internal circuitry
6. SYNC: Synchronization pin for external clock
7. RT/CLKOUT: Timing resistor/Clock output pin
8. SW: Switch node connection for external MOSFET
9. PGND: Power ground pin
10. VSENSE+: Positive input for current sense amplifier
11. VSENSE-: Negative input for current sense amplifier
12. ITH: Current sense threshold pin
13. SS/TR2: Second soft-start/tracking pin
14. MODE: Mode selection pin
15. VREF: Reference voltage output
16. VOUT: Output voltage pin

Functional Features

The LT3756IUD-1#PBF offers the following functional features:

• Wide input voltage range allows for versatile power supply designs.
• High voltage capability enables regulation of output voltages up to 100V.
• Current mode control provides excellent line and load regulation.
• Programmable soft-start feature prevents excessive inrush current during startup.
• Synchronization capability allows for synchronization with an external clock source.
• Comprehensive protection features safeguard against overvoltage, undervoltage, and thermal issues.

Advantages and Disadvantages

Advantages

• Wide input voltage range and high voltage capability make it suitable for various applications.
• Excellent line and load regulation ensure stable output voltage.
• Programmable soft-start feature protects the circuit from excessive inrush current.
• Synchronization capability allows for system integration with external clock sources.
• Comprehensive protection features enhance reliability and safety.

Disadvantages

• Limited availability of alternative models may restrict design flexibility.
• The 16-lead QFN package may require careful PCB layout considerations.

Working Principles

The LT3756IUD-1#PBF operates based on a current mode control architecture. It regulates the output voltage by adjusting the duty cycle of the external N-channel MOSFETs. The feedback pin (FB) monitors the output voltage and provides feedback to the control circuitry, which adjusts the duty cycle accordingly. The IC also incorporates various protection features to ensure safe operation under different conditions.

Detailed Application Field Plans

The LT3756IUD-1#PBF finds applications in various fields, including:

1. Industrial power supplies
2. Automotive electronics
3. LED lighting systems
4. Telecom infrastructure
5. Battery charging systems
6. Renewable energy systems

Detailed and Complete Alternative Models

While the LT3756IUD-1#PBF is a versatile IC, there are alternative models available that offer similar functionality. Some notable alternatives include:

1. LT3756: Similar specifications and features, but with a different package option.
2. LTC3780: Offers higher input voltage range and additional features such as constant current mode.
3. LM5117: Provides similar voltage regulation capabilities but in a different package and with slightly different specifications.

These alternative models can be considered based on specific design requirements and availability.

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