LT3579IFE

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Wide Input Voltage Range, Adjustable Output Voltage, Synchronous Rectification
• Package: 16-Lead TSSOP
• Essence: Step-Down DC/DC Converter
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 3V to 40V
• Output Voltage Range: 0.8V to 36V
• Switching Frequency: 100kHz to 2MHz
• Maximum Output Current: 1A
• Efficiency: Up to 95%
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3579IFE has a 16-lead TSSOP package with the following pin configuration:

1. VIN: Input Voltage
2. SW: Switch Node Connection
3. PGND: Power Ground
4. FB: Feedback Pin for Output Voltage Regulation
5. VCC: IC Supply Voltage
6. GND: Ground
7. SS/TR: Soft-Start/Tracking Pin
8. SYNC/MODE: External Clock Synchronization/Mode Selection
9. RT: Oscillator Timing Resistor
10. CT: Oscillator Timing Capacitor
11. BST: Bootstrap Pin for High-Side Gate Driver
12. LX: Inductor Connection
13. COMP: Compensation Pin for Loop Stability
14. EN/UVLO: Enable/Input Undervoltage Lockout
15. AGND: Analog Ground
16. VOUT: Output Voltage

Functional Features

• Wide input voltage range allows operation from various power sources.
• Step-down converter provides adjustable output voltage.
• High efficiency ensures minimal power loss.
• Synchronous rectification improves overall efficiency.
• Soft-start and tracking features for controlled startup.
• External clock synchronization and mode selection options.
• Compensation pin for loop stability.

Advantages and Disadvantages

Advantages

• Wide input voltage range enables versatile applications.
• Adjustable output voltage provides flexibility.
• High efficiency reduces power consumption.
• Synchronous rectification improves overall efficiency.
• Soft-start and tracking features ensure controlled startup.
• External clock synchronization allows for system integration.
• Compensation pin enhances loop stability.

Disadvantages

• Limited maximum output current (1A).
• Requires additional external components for operation.
• Higher switching frequencies may introduce noise.

Working Principles

The LT3579IFE is a step-down DC/DC converter that efficiently converts a higher input voltage to a lower output voltage. It utilizes a synchronous rectification technique to minimize power losses during the conversion process. The IC operates by controlling the duty cycle of the internal switches, allowing it to regulate the output voltage according to the feedback received from the FB pin. The soft-start feature ensures a gradual increase in output voltage during startup, while the compensation pin helps maintain loop stability.

Detailed Application Field Plans

The LT3579IFE is suitable for various applications, including but not limited to:

1. Battery-powered devices
2. Industrial equipment
3. Automotive electronics
4. Telecommunications systems
5. Power supplies
6. LED lighting

Detailed and Complete Alternative Models

1. LT3579EFE: 16-Lead TSSOP package, similar specifications and features.
2. LT3579HFE: 16-Lead TSSOP package, extended temperature range (-40°C to 150°C).
3. LT3579IFE-1: 16-Lead TSSOP package, improved efficiency and thermal performance.

These alternative models offer similar functionality and can be considered as substitutes for the LT3579IFE.

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