aat4644 Datasheet - Analogictech
The AAT4644 is a 4-channel current-limited switch designed for applications requiring high current capability and low on-resistance.
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📝 Component Overview
The AAT4644 is a 4-channel current-limited switch designed for applications requiring high current capability and low on-resistance. It operates from a 2.5V to 5.5V input voltage range and can handle output currents up to 500mA per channel. The device features an internal current limit to prevent damage from overcurrent conditions and has a low quiescent current when not in use.
Key Features and Benefits
- 4-channel current-limited switch
- High current capability up to 500mA per channel
- Low on-resistance for minimal voltage drop
- Internal current limit for overcurrent protection
- Low quiescent current in shutdown mode
- Operating voltage range from 2.5V to 5.5V
Typical Applications
- USB port power management
- Battery charging and management
- Power distribution in portable devices
- Current limiting for protection of downstream components
- Power sequencing and control in complex systems
- Hot swap and circuit breaker applications
📊 Complete Technical Specifications
Absolute Maximum Ratings
| Parameter | Value |
|---|---|
| Input Voltage | 5.5V |
| Operating Temperature | -40°C to +85°C |
| Storage Temperature | -40°C to +150°C |
Electrical Characteristics
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| On-Resistance | VCC = 5V, IOUT = 500mA | 0.25Ω | 0.35Ω | 0.45Ω | Ω |
| Quiescent Current | VCC = 5V, No Load | 0.01mA | 0.1mA | 1mA | mA |
Package Information
- TSSOP-8: 8-lead Thin Shrink Small Outline Package
- SO-8: 8-lead Small Outline Package
Pin Configuration
- Pin 1: VIN - Input Voltage
- Pin 2: OUT1 - Output Channel 1
🔧 Application Guidelines
Design Considerations
When designing with the AAT4644, consider the maximum input voltage and output current requirements. Ensure the device is properly heatsinked for high current applications and follow the recommended PCB layout for optimal performance.
Installation Guidelines
Mount the AAT4644 on a PCB with the recommended footprint. Ensure all pins are securely soldered to prevent damage during operation. Follow standard reflow soldering procedures for SMD components.
Operational Notes
The AAT4644 has an internal current limit to protect against overcurrent conditions. However, it is still important to design the system with appropriate fusing or current limiting to prevent damage from external faults.