LTC4357CDCB#TRMPBF

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High-performance power ORing controller
• Package: 6-Lead DFN (Dual Flat No-Lead)
• Essence: Provides seamless power path selection and protection for redundant power supplies
• Packaging/Quantity: Tape & Reel, 2500 units per reel

Specifications

• Input Voltage Range: 2.9V to 18V
• Operating Temperature Range: -40°C to 85°C
• Quiescent Current: 50µA (typical)
• Overvoltage Threshold: 4.5V (typical)
• Reverse Voltage Protection: Up to -40V
• Fault Flag Output: Open-drain, active-low
• Maximum Continuous Current: 10A

Pin Configuration

The LTC4357CDCB#TRMPBF has the following pin configuration:

1. GATE: Controls the external N-channel MOSFET
2. VIN: Positive supply input
3. VOUT: Output voltage
4. FLT: Fault flag output
5. GND: Ground
6. REF: Reference voltage input

Functional Features

• Seamless Power Path Selection: Automatically selects the higher voltage source as the primary power supply
• Reverse Voltage Protection: Protects against reverse polarity connection
• Overvoltage Protection: Monitors the input voltage and disconnects the faulty source if it exceeds the overvoltage threshold
• Fault Flag Output: Provides a signal indicating a fault condition
• Fast Switchover: Minimizes downtime during power source transitions

Advantages

• Reliable Power Redundancy: Ensures uninterrupted power supply by seamlessly switching between redundant sources
• Enhanced System Reliability: Protects against reverse polarity and overvoltage conditions, preventing damage to sensitive components
• Compact and Easy to Use: The small package size and simple pin configuration make it suitable for space-constrained applications

Disadvantages

• Limited Current Handling: The maximum continuous current of 10A may not be sufficient for high-power applications
• External MOSFET Required: Requires an external N-channel MOSFET for power switching, adding complexity to the design

Working Principles

The LTC4357CDCB#TRMPBF is designed to provide seamless power path selection and protection for redundant power supplies. It utilizes a control circuitry that monitors the input voltages and automatically selects the higher voltage source as the primary power supply. In case of a fault condition such as reverse polarity or overvoltage, the faulty source is disconnected to prevent damage to the system.

The device also features a fault flag output that provides a signal indicating a fault condition. This can be used to trigger an alarm or initiate appropriate actions in the system. The fast switchover capability ensures minimal downtime during power source transitions, maintaining uninterrupted power supply.

Application Field Plans

The LTC4357CDCB#TRMPBF is widely used in various applications where power redundancy and protection are critical. Some potential application fields include:

1. Data Centers: Ensuring uninterrupted power supply to critical servers and networking equipment.
2. Telecommunications: Protecting communication infrastructure from power source failures.
3. Industrial Automation: Providing reliable power backup for control systems and machinery.
4. Medical Devices: Safeguarding medical equipment against power disruptions.
5. Automotive Electronics: Enhancing the reliability of automotive electronic systems.

Alternative Models

• LTC4357IDCB#TRMPBF: 8-Lead DFN package, similar functionality
• LTC4357HDDB#TRMPBF: 12-Lead DFN package, higher current handling capability
• LTC4357CDCB#PBF: 6-Lead DFN package, lead-free version

Note: Please refer to the manufacturer's datasheet for detailed specifications and alternative models.

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