LTC4221CGN#PBF

Product Overview

Category: Integrated Circuits (ICs)

Use: Power Management IC

Characteristics: - Dual Ideal Diode Controller and PowerPath Selector - Monitors two power sources and automatically switches between them - Prevents reverse current flow and protects the power sources - Suitable for applications requiring redundant power sources

Package: 16-SSOP (0.154", 3.90mm Width)

Essence: The LTC4221CGN#PBF is an integrated circuit that serves as a dual ideal diode controller and power path selector. It allows for seamless switching between two power sources, preventing reverse current flow and protecting the power sources.

Packaging/Quantity: The LTC4221CGN#PBF is available in a 16-SSOP package. It is typically sold in reels of 2500 units.

Specifications

• Input Voltage Range: -40V to 80V
• Operating Temperature Range: -40°C to 85°C
• Quiescent Current: 50µA
• Switching Frequency: 400kHz
• Overvoltage Protection Threshold: Adjustable from 2.5V to 20V
• Reverse Current Protection Threshold: Adjustable from 2.5mV to 20mV

Pin Configuration

The LTC4221CGN#PBF has a 16-pin SSOP package with the following pin configuration:

1. V1IN - Input Voltage 1
2. V2IN - Input Voltage 2
3. GND - Ground
4. FLT1 - Fault Indicator 1
5. FLT2 - Fault Indicator 2
6. OV1 - Overvoltage Threshold 1
7. OV2 - Overvoltage Threshold 2
8. RC1 - Reverse Current Threshold 1
9. RC2 - Reverse Current Threshold 2
10. V1OUT - Output Voltage 1
11. V2OUT - Output Voltage 2
12. EN - Enable Pin
13. GATE1 - Gate Control 1
14. GATE2 - Gate Control 2
15. SS - Soft-Start Pin
16. PG - Power Good Indicator

Functional Features

• Dual Ideal Diode Controller: The LTC4221CGN#PBF acts as a controller for two ideal diodes, allowing for seamless switching between two power sources.
• PowerPath Selector: It automatically selects the power source with the higher voltage and switches to it, ensuring uninterrupted power supply.
• Reverse Current Protection: The LTC4221CGN#PBF prevents reverse current flow, protecting the power sources from damage.
• Fault Indicators: The FLT1 and FLT2 pins provide fault indication when a power source is outside the specified voltage range.
• Adjustable Thresholds: The overvoltage and reverse current protection thresholds can be adjusted according to the application requirements.

Advantages and Disadvantages

Advantages: - Seamless power source switching - Prevents reverse current flow - Protects power sources from damage - Adjustable protection thresholds - Fault indication for easy troubleshooting

Disadvantages: - Limited to dual power source applications - Requires careful configuration of protection thresholds

Working Principles

The LTC4221CGN#PBF works by monitoring the voltages of two power sources, V1IN and V2IN. It compares the voltages and selects the power source with the higher voltage. The selected power source is then connected to the output, while the other power source is disconnected.

To prevent reverse current flow, the LTC4221CGN#PBF utilizes ideal diode emulation. When one power source has a lower voltage than the other, the ideal diode controller ensures that current flows only from the higher voltage source to the output.

The protection thresholds for overvoltage and reverse current can be adjusted using the OV1, OV2, RC1, and RC2 pins. This allows customization of the protection levels based on the specific requirements of the application.

Detailed Application Field Plans

The LTC4221CGN#PBF is commonly used in applications where redundant power sources are required. Some examples include:

1. Telecom Systems: Ensuring uninterrupted power supply to critical components in telecom systems.
2. Industrial Control Systems: Providing backup power sources for critical control systems in industrial environments.
3. Data Centers: Reducing downtime by seamlessly switching between primary and backup power sources.
4. Medical Equipment: Ensuring continuous operation of medical devices by utilizing redundant power sources.
5. Automotive Electronics: Protecting sensitive electronic components in vehicles from power source failures.

Detailed and Complete Alternative Models

1. LTC4412ES6#TRMPBF: Single Ideal Diode Controller and PowerPath Selector in a 6-DFN package.
2. LTC4417EDD