Overview
The LT3599IFE#PBF, produced by Analog Devices Inc., is a highly integrated 4-string LED driver IC designed for driving up to four strings of LEDs at 120mA each. This fixed frequency 2A step-up DC/DC converter is capable of producing an output voltage of up to 44V, making it suitable for various display and lighting applications. The device features programmable LED current, analog and PWM dimming, and robust fault detection mechanisms such as OPENLED and SHORTLED alerts.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 28-Lead Plastic TSSOP |
| Operating Temperature Range | –40°C to 125°C |
| Input Voltage Range | 3.1V to 5.5V |
| Output Voltage Range | Up to 44V |
| LED Current per String | 30mA to 120mA |
| Current Matching Accuracy | ±1.5% |
| Switching Frequency Range | 200kHz to 2.1MHz |
| Dimming Ratio | Up to 3000:1 |
| Efficiency | Up to 90% |
Key Features
- Drives four strings of LEDs at up to 120mA each with ±1.5% current matching accuracy.
- Programmable LED current through an external resistor on the ISET pin.
- Analog and PWM dimming capabilities.
- Switching frequency synchronization to an external clock.
- LED string disable control via the DISABLE4 pin.
- OPENLED and SHORTLED alert pins for fault detection.
- Overvoltage protection using the FB pin.
- True Color PWM dimming with a dimming ratio up to 3000:1.
- Available in thermally enhanced 32-pin QFN and 28-pin TSSOP packages.
Applications
- Automotive navigation and TFT LCD displays.
- Desktop and notebook TFT LCD displays.
- General LED lighting applications requiring high current accuracy and dimming control.
Q & A
- What is the maximum output voltage of the LT3599?
The LT3599 can produce an output voltage of up to 44V. - How many LED strings can the LT3599 drive?
The LT3599 can drive up to four strings of LEDs. - What is the current range per LED string?
The current range per LED string is 30mA to 120mA. - What is the accuracy of the current matching?
The current matching accuracy is ±1.5%. - What are the dimming options available?
The LT3599 supports both analog and PWM dimming. - How is the switching frequency controlled?
The switching frequency can be programmed from 200kHz to 2.1MHz using an external resistor. - What fault detection mechanisms are available?
The device includes OPENLED and SHORTLED alert pins for fault detection. - What is the efficiency of the LT3599?
The efficiency of the LT3599 can be up to 90%. - In what packages is the LT3599 available?
The LT3599 is available in 32-pin QFN and 28-pin TSSOP packages. - What is the operating temperature range of the LT3599IFE#PBF?
The operating temperature range is –40°C to 125°C.
