LT3754IUH#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: The LT3754IUH#PBF is a high voltage, current mode, DC/DC controller designed for driving an external N-channel power MOSFET. It is specifically designed to operate in harsh environments and is suitable for various applications that require high voltage conversion.

Characteristics: - High voltage operation - Current mode control - Wide input voltage range - Adjustable switching frequency - Programmable soft-start - Fault protection features

Package: The LT3754IUH#PBF comes in a 28-lead thermally enhanced TSSOP package, which provides excellent thermal performance and allows for compact designs.

Essence: The essence of the LT3754IUH#PBF is its ability to efficiently convert high voltages while providing precise control over the output.

Packaging/Quantity: The LT3754IUH#PBF is typically available in reels of 2500 units.

Specifications

• Input Voltage Range: 4V to 100V
• Output Voltage Range: 0.8V to 60V
• Switching Frequency Range: 100kHz to 1MHz
• Maximum Duty Cycle: 90%
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3754IUH#PBF has a total of 28 pins. Here is a detailed pin configuration:

1. VCC: Power supply input
2. GND: Ground reference
3. FB: Feedback voltage input
4. COMP: Compensation node for loop stability
5. SS: Soft-start capacitor connection
6. RT: Timing resistor connection for switching frequency control
7. SYNC: Synchronization input for multiple ICs
8. CLKOUT: Clock output for synchronization
9. VCCSENSE: Voltage sense input for VCC monitoring
10. VIN: Input voltage connection
11. SW: Switch node connection to external MOSFET
12. PGND: Power ground connection 13-28. NC: No connect pins

Functional Features

The LT3754IUH#PBF offers several functional features that enhance its performance and usability:

1. High Voltage Operation: The IC can handle input voltages up to 100V, making it suitable for a wide range of applications.
2. Current Mode Control: The current mode control architecture provides excellent line and load regulation.
3. Wide Input Voltage Range: The IC can operate with input voltages as low as 4V, allowing for flexibility in various power supply designs.
4. Adjustable Switching Frequency: The switching frequency can be adjusted using an external timing resistor, enabling optimization for different applications.
5. Programmable Soft-Start: The soft-start feature allows for controlled startup and prevents excessive inrush current.
6. Fault Protection Features: The IC incorporates various protection mechanisms such as overvoltage protection, undervoltage lockout, and thermal shutdown.

Advantages and Disadvantages

Advantages: - High voltage operation enables use in a wide range of applications. - Current mode control ensures stable and efficient power conversion. - Wide input voltage range provides flexibility in design. - Adjustable switching frequency allows for optimization. - Fault protection features enhance reliability and safety.

Disadvantages: - Limited maximum duty cycle may restrict certain applications requiring higher duty cycles. - The package size may not be suitable for space-constrained designs.

Working Principles

The LT3754IUH#PBF operates based on a current mode control scheme. It regulates the output voltage by adjusting the duty cycle of the external N-channel power MOSFET. The feedback voltage is compared to a reference voltage, and the resulting error signal is used to control the switching of the MOSFET. This control mechanism ensures stable output voltage despite variations in input voltage and load conditions.

Detailed Application Field Plans

The LT3754IUH#PBF can be applied in various fields, including but not limited to: - Industrial power supplies - Automotive electronics - LED lighting systems - Telecom infrastructure - Battery charging systems

In industrial power supplies, the IC can efficiently convert high voltages for use in motor drives, factory automation, and other industrial equipment. In automotive electronics, it can be utilized for DC/DC converters, battery management systems, and electric vehicle applications. LED lighting systems benefit from its high voltage conversion capabilities and precise control over the output. The IC also finds application in telecom infrastructure for powering base stations, routers, and switches. Lastly, it can be employed in battery charging systems for portable devices, electric vehicles, and renewable energy systems.

Detailed and Complete Alternative Models

1. LT3754A: Similar to LT3754IUH#PBF, but with extended temperature range (-40°C to 150°C).