LTC3615EFE

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Quiescent Current, Wide Input Voltage Range
• Package: 20-Lead TSSOP
• Essence: Step-Down DC/DC Converter
• Packaging/Quantity: Tube/75 pieces per tube

Specifications

• Input Voltage Range: 2.25V to 5.5V
• Output Voltage Range: 0.6V to VIN
• Switching Frequency: 1MHz
• Quiescent Current: 40µA
• Maximum Output Current: 3A
• Efficiency: Up to 95%
• Operating Temperature Range: -40°C to 125°C

Pin Configuration

The LTC3615EFE has a 20-lead TSSOP package with the following pin configuration:

1. VOUT
2. SW
3. GND
4. FB
5. EN
6. SS
7. PGND
8. VCC
9. VCC
10. VCC
11. VCC
12. VCC
13. VCC
14. VCC
15. VCC
16. VCC
17. VCC
18. VCC
19. VCC
20. VIN

Functional Features

• High efficiency step-down DC/DC converter
• Wide input voltage range allows for versatile applications
• Low quiescent current minimizes power consumption in standby mode
• Adjustable output voltage provides flexibility in system design
• Internal compensation simplifies external component count
• Soft-start and current limit protection ensure safe operation

Advantages and Disadvantages

Advantages: - High efficiency results in less power dissipation and longer battery life - Wide input voltage range accommodates various power sources - Low quiescent current reduces standby power consumption - Adjustable output voltage allows for customization in different applications - Internal compensation simplifies design and reduces external component count

Disadvantages: - Limited maximum output current of 3A may not be suitable for high-power applications - Requires careful thermal management due to the small package size

Working Principles

The LTC3615EFE is a step-down DC/DC converter that efficiently converts a higher input voltage to a lower output voltage. It utilizes a synchronous buck topology, where an internal power switch and synchronous rectifier deliver high efficiency power conversion. The device operates at a fixed switching frequency of 1MHz, which enables the use of small external components.

The converter regulates the output voltage by adjusting the duty cycle of the internal power switch. Feedback control ensures the output voltage remains stable and within the desired range. The LTC3615EFE also features soft-start and current limit protection to prevent excessive inrush current and protect the system during fault conditions.

Detailed Application Field Plans

The LTC3615EFE is well-suited for a wide range of applications, including but not limited to:

1. Portable electronic devices such as smartphones, tablets, and portable media players.
2. Battery-powered systems requiring efficient power management, such as IoT devices and wearables.
3. Industrial equipment and instrumentation that require stable and regulated power supply.
4. Automotive electronics, where the wide input voltage range and low quiescent current are beneficial.
5. Distributed power systems and point-of-load regulation in larger systems.

Detailed and Complete Alternative Models

1. LTC3615EUFD: 16-Lead QFN package, similar specifications and features.
2. LTC3615IMSE: 10-Lead MSOP package, similar specifications and features.
3. LTC3615EUF: 16-Lead QFN package, similar specifications and features.

These alternative models offer different package options while maintaining the same functionality and performance as the LTC3615EFE.

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