LT3845AMPFE#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

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 Plastic TSSOP

Essence: The LT3845AMPFE#PBF is a high-performance power management IC designed for various applications requiring efficient power conversion.

Packaging/Quantity: Available in tape and reel packaging, with a quantity of 250 units per reel.

Specifications

• Input Voltage Range: 4.5V to 60V
• Output Voltage Range: 0.8V to 55V
• Switching Frequency: Up to 500kHz
• Maximum Duty Cycle: 90%
• Quiescent Current: 2.5mA
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3845AMPFE#PBF features a 16-lead plastic TSSOP package with the following pin configuration:

1. VIN: Input voltage pin
2. GND: Ground pin
3. FB: Feedback pin
4. SYNC/SS: Synchronization/Synchronization input or soft-start pin
5. VCC: Supply voltage pin
6. COMP: Compensation pin
7. SS/TR: Soft-start/Tracking pin
8. RT/CLKOUT: Timing resistor/Timing capacitor or clock output pin
9. SW: Switch node pin
10. SW: Switch node pin
11. SW: Switch node pin
12. SW: Switch node pin
13. PGND: Power ground pin
14. PGND: Power ground pin
15. VCC: Supply voltage pin
16. VIN: Input voltage pin

Functional Features

• High efficiency power conversion
• Current mode control for improved stability and transient response
• Synchronous rectification for reduced power losses
• Programmable soft-start to limit inrush current
• Overvoltage protection to safeguard the circuit from excessive voltage
• Undervoltage lockout to prevent operation at low input voltages
• Thermal shutdown to protect against overheating

Advantages and Disadvantages

Advantages: - Wide input voltage range allows for versatile applications - High efficiency results in reduced power consumption - Adjustable output voltage provides flexibility - Synchronous rectification improves overall efficiency - Programmable soft-start reduces inrush current

Disadvantages: - Limited maximum duty cycle may restrict certain applications - Requires external components for proper operation - Relatively high quiescent current compared to some alternatives

Working Principles

The LT3845AMPFE#PBF operates on a current mode control architecture, which provides excellent stability and transient response. It utilizes synchronous rectification to minimize power losses and increase overall efficiency. The IC incorporates various protection features such as overvoltage protection, undervoltage lockout, and thermal shutdown to ensure safe operation.

Detailed Application Field Plans

The LT3845AMPFE#PBF is suitable for a wide range of applications, including but not limited to: - Industrial power supplies - Telecom infrastructure - Automotive electronics - LED lighting - Battery charging systems - Distributed power architectures

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LT3845AMPFE#PBF include: - LT3845A - LT3845B - LT3845C - LT3845D

These models are part of the same product family and provide comparable features and performance.

In conclusion, the LT3845AMPFE#PBF is a versatile power management IC with high efficiency and a wide input voltage range. Its current mode control architecture, synchronous rectification, and various protection features make it suitable for a variety of applications. While it has some limitations, such as a limited maximum duty cycle and external component requirements, it offers several advantages such as adjustable output voltage and programmable soft-start.