Overview
The LT3474EFE#TRPBF is a step-down DC/DC converter designed by Analog Devices Inc. This integrated circuit is specifically engineered to operate as a constant-current source, making it ideal for LED driver applications. The device features a fixed frequency operation and includes an internal sense resistor to monitor and regulate the output current. It is packaged in a 16-lead plastic TSSOP and is lead-free and RoHS compliant.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Minimum Input Voltage | 3.5 | 4 | V | |
| Input Quiescent Current (Not Switching) | 2.6 | 4 | mA | |
| Shutdown Current | 0.01 | 2 | μA | |
| LED Pin Current (VADJ Tied to VREF) | 0.968 | 1 | 1.02 | A |
| Reference Voltage | 1.23 | 1.25 | 1.265 | V |
| Operating Temperature Range | –40 | 85 | °C | |
| Storage Temperature Range | –65 | 150 | °C | |
| Maximum Junction Temperature | 125 | °C | ||
| Switching Frequency (RT = 80.6kΩ) | 470 | 500 | 530 | kHz |
Key Features
- Fixed frequency step-down DC/DC converter designed for constant-current LED driver applications.
- Internal sense resistor for monitoring and regulating output current.
- Operating temperature range of –40°C to 85°C.
- Lead-free and RoHS compliant.
- 16-lead plastic TSSOP package.
- Low shutdown current of 0.01 μA to 2 μA.
- Reference voltage of 1.23 V to 1.265 V.
- Switching frequency adjustable via RT pin.
Applications
The LT3474EFE#TRPBF is primarily used in LED lighting systems where a constant current source is required. It is suitable for a variety of applications including:
- LED backlighting in displays and signage.
- General lighting solutions such as LED strips and modules.
- Automotive LED lighting systems.
- Industrial lighting applications requiring reliable and efficient LED drivers.
Q & A
- What is the primary function of the LT3474EFE#TRPBF?
The LT3474EFE#TRPBF is a step-down DC/DC converter designed to operate as a constant-current source for LED driver applications. - What is the minimum input voltage for the LT3474EFE#TRPBF?
The minimum input voltage is 3.5 V. - What is the typical shutdown current of the LT3474EFE#TRPBF?
The typical shutdown current is 2 μA. - What is the operating temperature range of the LT3474EFE#TRPBF?
The operating temperature range is –40°C to 85°C. - Is the LT3474EFE#TRPBF lead-free and RoHS compliant?
Yes, the LT3474EFE#TRPBF is lead-free and RoHS compliant. - What is the package type of the LT3474EFE#TRPBF?
The package type is a 16-lead plastic TSSOP. - How is the switching frequency adjusted in the LT3474EFE#TRPBF?
The switching frequency is adjustable via the RT pin. - What is the reference voltage range of the LT3474EFE#TRPBF?
The reference voltage range is 1.23 V to 1.265 V. - What are some common applications of the LT3474EFE#TRPBF?
Common applications include LED backlighting, general lighting solutions, automotive LED lighting, and industrial lighting. - What is the maximum junction temperature of the LT3474EFE#TRPBF?
The maximum junction temperature is 125°C.
