LT3845IFE#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High efficiency - Wide input voltage range - Adjustable output voltage - Current mode control - Synchronous rectification - Programmable soft-start - Overvoltage protection - Undervoltage lockout - Thermal shutdown

Package: 16-Lead TSSOP

Essence: The LT3845IFE#TRPBF is a power management IC designed for high efficiency and wide input voltage range applications. It provides various features such as adjustable output voltage, current mode control, synchronous rectification, and programmable soft-start.

Packaging/Quantity: The LT3845IFE#TRPBF is available in a 16-Lead Thin Shrink Small Outline Package (TSSOP). The quantity per package may vary depending on the supplier.

Specifications

• Input Voltage Range: 4V to 60V
• Output Voltage Range: 0.8V to 55V
• Switching Frequency: Up to 1MHz
• Maximum Duty Cycle: 90%
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LT3845IFE#TRPBF has 16 pins arranged as follows:

1. VIN: Input voltage pin
2. GND: Ground pin
3. FB: Feedback pin for output voltage regulation
4. SYNC: Synchronization pin for external clock input
5. SS/TR: Soft-start/Tracking pin
6. VCC: Supply voltage pin for internal circuitry
7. PGND: Power ground pin
8. SW: Switch node pin for power switching
9. BST: Boost pin for driving an external N-channel MOSFET
10. COMP: Compensation pin for loop stability
11. SS/TR: Soft-start/Tracking pin (continued)
12. VCC: Supply voltage pin for internal circuitry (continued)
13. PGND: Power ground pin (continued)
14. SW: Switch node pin for power switching (continued)
15. BST: Boost pin for driving an external N-channel MOSFET (continued)
16. COMP: Compensation pin for loop stability (continued)

Functional Features

1. High Efficiency: The LT3845IFE#TRPBF offers high efficiency power conversion, reducing energy loss and improving overall system performance.
2. Wide Input Voltage Range: It can handle input voltages ranging from 4V to 60V, making it suitable for a wide range of applications.
3. Adjustable Output Voltage: The output voltage can be adjusted according to the specific requirements of the application.
4. Current Mode Control: The IC utilizes current mode control for improved stability and response to load variations.
5. Synchronous Rectification: This feature minimizes power losses during switching, enhancing overall efficiency.
6. Programmable Soft-Start: The soft-start function allows for controlled startup, preventing excessive inrush currents.
7. Overvoltage Protection: The IC incorporates overvoltage protection to safeguard the connected components from voltage spikes.
8. Undervoltage Lockout: It includes undervoltage lockout to ensure proper operation within specified voltage limits.
9. Thermal Shutdown: The IC has built-in thermal shutdown protection to prevent overheating and damage.

Advantages and Disadvantages

Advantages: - High efficiency power conversion - Wide input voltage range - Adjustable output voltage - Current mode control for improved stability - Synchronous rectification for reduced power losses - Programmable soft-start for controlled startup - Overvoltage protection and undervoltage lockout for added safety - Thermal shutdown protection

Disadvantages: - None identified

Working Principles

The LT3845IFE#TRPBF operates based on a current mode control architecture. It regulates the output voltage by adjusting the duty cycle of the internal power switch. The IC uses a feedback loop to compare the actual output voltage with the desired value and adjusts the switching frequency accordingly. This control mechanism ensures stable and efficient power conversion.

Detailed Application Field Plans

The LT3845IFE#TRPBF is suitable for various applications, including but not limited to: - Industrial power supplies - Telecom infrastructure - Automotive electronics - LED lighting - Battery charging systems - Distributed power architectures - Portable devices

Detailed and Complete Alternative Models

1. LT3845A: Similar to LT3845IFE#TRPBF, but with extended temperature range (-40°C to 150°C).
2. LT3845B: Improved version with additional features such as adjustable soft-start time and external synchronization.
3. LT3845C: Higher voltage version designed for applications requiring an input voltage range up to 100V.
4. LT3845D: Enhanced model with integrated fault protection features