LT3667IUDD

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management IC

Characteristics: - High efficiency step-down DC/DC converter - Wide input voltage range - Adjustable output voltage - Low quiescent current - Internal compensation - Synchronous rectification - Soft-start and tracking - Overvoltage protection - Thermal shutdown

Package: 16-Lead 3mm × 3mm DFN

Essence: The LT3667IUDD is a versatile power management IC designed for step-down DC/DC conversion applications. It offers high efficiency, a wide input voltage range, and various built-in features for enhanced performance.

Packaging/Quantity: The LT3667IUDD is available in a 16-Lead 3mm × 3mm DFN package. The quantity per package may vary depending on the supplier.

Specifications

• Input Voltage Range: 2.5V to 40V
• Output Voltage Range: 0.8V to VIN
• Maximum Output Current: 2A
• Switching Frequency: Up to 1MHz
• Quiescent Current: 60µA
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LT3667IUDD has the following pin configuration:

1. SW: Switch Node Connection
2. GND: Ground
3. FB: Feedback Voltage Input
4. VCC: Supply Voltage Input
5. SS/TRK: Soft-Start/Tracking Control
6. SYNC/MODE: External Clock Synchronization/Input Voltage Selection
7. PGND: Power Ground
8. LX: Inductor Connection
9. LX: Inductor Connection
10. EN: Enable Pin
11. VOUT: Output Voltage
12. VOUT: Output Voltage
13. VOUT: Output Voltage
14. VOUT: Output Voltage
15. VOUT: Output Voltage
16. VOUT: Output Voltage

Functional Features

1. High Efficiency: The LT3667IUDD offers high efficiency conversion, minimizing power losses and maximizing battery life.
2. Wide Input Voltage Range: It can handle input voltages ranging from 2.5V to 40V, making it suitable for a wide range of applications.
3. Adjustable Output Voltage: The output voltage can be adjusted from 0.8V to the input voltage (VIN), providing flexibility in various power supply requirements.
4. Internal Compensation: The IC includes internal compensation circuitry, simplifying the design and reducing external component count.
5. Synchronous Rectification: The LT3667IUDD utilizes synchronous rectification to improve efficiency and reduce power dissipation.
6. Soft-Start and Tracking: Soft-start and tracking features ensure controlled startup and accurate voltage tracking during load changes.
7. Overvoltage Protection: The IC incorporates overvoltage protection to safeguard the connected circuitry from excessive voltage levels.
8. Thermal Shutdown: It includes thermal shutdown functionality to prevent overheating and protect the IC.

Advantages and Disadvantages

Advantages: - High efficiency conversion - Wide input voltage range - Adjustable output voltage - Internal compensation reduces external component count - Synchronous rectification improves efficiency - Soft-start and tracking features for controlled startup and accurate voltage tracking - Overvoltage protection safeguards connected circuitry - Thermal shutdown prevents overheating

Disadvantages: - None identified

Working Principles

The LT3667IUDD is a step-down DC/DC converter that operates by converting a higher input voltage to a lower output voltage. It uses a switching regulator topology to achieve efficient power conversion. The IC controls the switching of an internal power MOSFET to regulate the output voltage based on the feedback received from the FB pin. The synchronous rectification further improves efficiency by reducing power losses during switching.

Detailed Application Field Plans

The LT3667IUDD is suitable for a wide range of applications, including but not limited to: - Battery-powered devices - Portable electronics - Industrial equipment - Automotive systems - Distributed power supplies - LED lighting

Detailed and Complete Alternative Models

1. LT3652: Similar step-down DC/DC converter with integrated power switches and additional features.
2. LT8610: High-efficiency synchronous step-down DC/DC converter with adjustable output voltage and wide input voltage range.
3. LT1763: Low dropout linear regulator with adjustable output voltage and low quiescent current.

These alternative models offer similar functionality and can be considered as alternatives to the LT3667IUDD based on specific application requirements.

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