LTC4420CDD#TRPBF

LTC4420CDD#TRPBF

Product Overview

Category: Integrated Circuit (IC)

Use: Power Management

Characteristics: - Low voltage, high current diode-OR controller - Ideal for power supply redundancy applications - Provides seamless switchover between two input supplies - Prevents reverse current flow from the output to the input supplies - Offers undervoltage lockout and thermal shutdown protection

Package: DFN-8 (3mm x 3mm)

Essence: The LTC4420CDD#TRPBF is a diode-OR controller designed for power management applications. It allows for the seamless switching between two input supplies, ensuring uninterrupted power supply and preventing reverse current flow.

Packaging/Quantity: The LTC4420CDD#TRPBF is available in a DFN-8 package and is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: 2.5V to 36V
• Output Voltage Range: 2.5V to 36V
• Operating Temperature Range: -40°C to 85°C
• Quiescent Current: 20µA
• Maximum Supply Current: 1.5mA

Pin Configuration

The LTC4420CDD#TRPBF features the following pin configuration:

```

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| | --| EN1 EN2 |-- Enable Inputs --| GATE1 GATE2|-- Gate Drive Outputs --| VIN1 VIN2 |-- Input Supplies --| VOUT |-- Output --| GND |-- Ground |___________| ```

Functional Features

1. Diode-OR Controller: The LTC4420CDD#TRPBF acts as a diode-OR controller, allowing for seamless switchover between two input supplies. It ensures uninterrupted power supply by preventing reverse current flow from the output to the input supplies.

2. Power Supply Redundancy: This IC is ideal for power supply redundancy applications, where a backup power source is required to take over in case of a failure in the primary power supply.

3. Undervoltage Lockout (UVLO): The LTC4420CDD#TRPBF incorporates UVLO protection, which disables the outputs when the input voltage falls below a certain threshold. This feature helps prevent damage to connected devices during low voltage conditions.

4. Thermal Shutdown Protection: To safeguard against overheating, the LTC4420CDD#TRPBF includes thermal shutdown protection. If the temperature exceeds a specified limit, the device will automatically shut down to prevent damage.

Advantages and Disadvantages

Advantages: - Seamless switchover between two input supplies - Prevents reverse current flow - Ideal for power supply redundancy applications - UVLO and thermal shutdown protection

Disadvantages: - Limited to a maximum input/output voltage range of 36V - Quiescent current of 20µA may be relatively high for some low-power applications

Working Principles

The LTC4420CDD#TRPBF works by monitoring the voltages of the two input supplies and controlling the gate drive outputs accordingly. When one input supply fails or drops below a certain threshold, the controller switches to the other supply seamlessly, ensuring uninterrupted power delivery to the output. It also prevents reverse current flow, protecting the input supplies from potential damage.

Application Field Plans

The LTC4420CDD#TRPBF can be used in various applications that require power supply redundancy and seamless switchover. Some potential application fields include:

1. Telecommunications: Ensuring continuous power supply to critical communication equipment, such as routers and switches.

2. Industrial Automation: Providing backup power to control systems and machinery in industrial environments.

3. Data Centers: Maintaining uninterrupted power supply to servers and networking equipment.

4. Medical Devices: Ensuring reliable power delivery to critical medical equipment, such as patient monitors and life support systems.

Alternative Models

1. LTC4412: Similar diode-OR controller with additional features like adjustable undervoltage lockout and reverse current protection.

2. MAX40200: Dual-input ideal diode controller with low quiescent current and wide input voltage range.

3. TPS2115A: Power multiplexer with automatic switchover between two input supplies and adjustable UVLO thresholds.

4. ADG849: Precision analog switch with low on-resistance and fast switching speed, suitable for power routing applications.

These alternative models offer similar functionality and can be considered based on specific requirements and design constraints.

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