Overview
The LT3599EFE#TRPBF from Analog Devices Inc. is a highly integrated 4-string 120mA LED driver designed for efficient and precise LED lighting applications. This fixed frequency 2A step-up DC/DC converter is capable of driving four strings of LEDs up to a 44V output voltage, ensuring high accuracy and reliability in LED current regulation even when the input voltage exceeds the LED output voltage.
The device features programmable switching frequency, analog and PWM dimming, and various protection mechanisms such as OPENLED and SHORTLED alerts, making it a robust solution for a wide range of LED lighting systems.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Minimum Operating Voltage | 2.7 | - | - | V |
| Maximum Operating Voltage | - | - | 30 | V |
| Reference Voltage (VREF) | 1.20 | 1.22 | 1.24 | V |
| Switching Frequency Range | 200kHz | - | 2.1MHz | - |
| Output Voltage (VOUT) | - | - | 44 | V |
| LED Current per String | - | 120mA | - | - |
| Operating Temperature Range | -40°C | - | 125°C | - |
| Package Type | - | - | 28-Lead Plastic TSSOP | - |
Key Features
- Programmable Switching Frequency: Adjustable from 200kHz to 2.1MHz via an external resistor.
- Analog and PWM Dimming: Supports both analog dimming on the CTRL pin and PWM dimming on the PWM pin.
- High Accuracy Current Regulation: Ensures ±1.5% current matching across all LED strings.
- Protection Mechanisms: Includes OPENLED and SHORTLED alerts, overvoltage protection, and LED string disable control.
- Thermal Management: Available in thermally enhanced packages such as 28-Lead Plastic TSSOP and 32-Lead QFN.
- Wide Operating Temperature Range: Operates from -40°C to 125°C or up to 150°C for the H-grade version.
Applications
- LED Lighting Systems: Suitable for driving multiple strings of LEDs in various lighting applications.
- Automotive Lighting: Ideal for automotive LED lighting systems due to its robust protection features and wide operating temperature range.
- Industrial Lighting: Used in industrial lighting solutions where high reliability and precision are required.
- Display Backlighting: Can be used for backlighting in LCD displays and other similar applications.
Q & A
- What is the maximum output voltage of the LT3599EFE#TRPBF?
The maximum output voltage is up to 44V.
- How can the switching frequency be adjusted?
The switching frequency can be adjusted from 200kHz to 2.1MHz via an external resistor.
- What types of dimming does the LT3599EFE#TRPBF support?
The device supports both analog dimming on the CTRL pin and PWM dimming on the PWM pin.
- What is the current matching accuracy of the LT3599EFE#TRPBF?
The current matching accuracy is ±1.5% across all LED strings.
- What protection mechanisms are included in the LT3599EFE#TRPBF?
The device includes OPENLED and SHORTLED alerts, overvoltage protection, and LED string disable control.
- What is the operating temperature range of the LT3599EFE#TRPBF?
The operating temperature range is from -40°C to 125°C.
- What package types are available for the LT3599EFE#TRPBF?
The device is available in 28-Lead Plastic TSSOP and 32-Lead QFN packages.
- Can the LT3599EFE#TRPBF be used in automotive applications?
Yes, it is suitable for automotive LED lighting systems due to its robust protection features and wide operating temperature range.
- How does the LT3599EFE#TRPBF handle open or shorted LED strings?
If an LED string is open, the device sets an OPENLED flag and regulates the output voltage for the remaining connected strings. If a short occurs, the device immediately turns off the LED pin current of the shorted string and sets a SHORTLED flag.
- What is the reference voltage (VREF) of the LT3599EFE#TRPBF?
The reference voltage (VREF) is approximately 1.22V.
