LTC3613EWKH

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High Efficiency, Low Quiescent Current, Wide Input Voltage Range
• Package: 24-Lead Exposed Pad QFN
• Essence: Step-Down DC/DC Converter
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.25V to 5.5V
• Output Voltage Range: 0.6V to VIN
• Switching Frequency: Up to 4MHz
• Quiescent Current: 20µA
• Maximum Output Current: 1A
• Efficiency: Up to 95%
• Operating Temperature Range: -40°C to 125°C

Detailed Pin Configuration

The LTC3613EWKH has a 24-lead exposed pad QFN package with the following pin configuration:

1. VIN: Input Voltage
2. SW: Switch Node Connection
3. PGND: Power Ground
4. AGND: Analog Ground
5. FB: Feedback Voltage Input
6. VCC: IC Supply Voltage
7. EN: Enable Pin
8. SS: Soft-Start Pin
9. RT: Oscillator Frequency Setting
10. BST: Bootstrap Capacitor Connection
11. LX: Inductor Connection
12. COMP: Compensation Node
13. SS/TRK: Soft-Start/Tracking Control
14. VOUT: Output Voltage
15. GATE: Gate Drive Output
16. PGND: Power Ground
17. AGND: Analog Ground
18. FB: Feedback Voltage Input
19. VCC: IC Supply Voltage
20. EN: Enable Pin
21. SS: Soft-Start Pin
22. RT: Oscillator Frequency Setting
23. BST: Bootstrap Capacitor Connection
24. LX: Inductor Connection

Functional Features

• High Efficiency Step-Down DC/DC Converter
• Wide Input Voltage Range for Versatile Applications
• Low Quiescent Current for Improved Power Efficiency
• Adjustable Output Voltage for Flexibility
• Integrated Soft-Start and Tracking Control
• Overcurrent and Overtemperature Protection
• Stable Operation with External Compensation

Advantages and Disadvantages

Advantages

• High Efficiency Operation Saves Power
• Wide Input Voltage Range Allows Compatibility with Various Power Sources
• Low Quiescent Current Extends Battery Life
• Compact Package Size Saves Board Space
• Integrated Protection Features Enhance System Reliability

Disadvantages

• Limited Maximum Output Current (1A)
• Requires External Compensation for Optimal Performance

Working Principles

The LTC3613EWKH is a step-down DC/DC converter that efficiently converts a higher input voltage to a lower output voltage. It utilizes a high-frequency switching regulator topology to achieve high efficiency and compact size. The integrated control circuitry ensures stable operation and protection against overcurrent and overtemperature conditions.

The device operates by controlling the duty cycle of the internal power switch to regulate the output voltage. An external inductor and capacitor are used to store and transfer energy, while the feedback loop adjusts the duty cycle based on the desired output voltage. The soft-start feature gradually ramps up the output voltage during startup to prevent excessive current draw.

Detailed Application Field Plans

The LTC3613EWKH is suitable for various applications that require efficient power management. Some potential application fields include:

1. Portable Electronic Devices: Smartphones, Tablets, Wearable Devices
2. Industrial Equipment: Test and Measurement Instruments, Data Loggers
3. Automotive Electronics: Infotainment Systems, Advanced Driver Assistance Systems (ADAS)
4. IoT Devices: Sensors, Gateways, Edge Computing Devices
5. Battery-Powered Systems: Wireless Communication Devices, Medical Devices

Detailed and Complete Alternative Models

1. LTC3613EWP: 24-Lead Plastic TSSOP Package
2. LTC3613EUH: 32-Lead QFN Package with Higher Maximum Output Current (2A)
3. LTC3613EMSE: 10-Lead MSOP Package for Space-Constrained Applications
4. LTC3613IMSE: 10-Lead MSOP Package with Industrial Temperature Range (-40°C to 125°C)
5. LTC3613MPMSE: 10-Lead MSOP Package with Military Temperature Range (-55°C to 125°C)

These alternative models offer different package options, higher output current capability, and extended temperature ranges to suit specific application requirements.

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