Overview
The CAT4008V-T1, produced by onsemi, is an 8-channel constant current driver designed for LED billboard and general display applications. This device allows for precise control over LED current through an external RSET resistor, enabling a wide range of current settings from 2 mA to 100 mA. It features a high-speed 4-wire serial interface with a clock frequency of up to 25 MHz, facilitating the control of each individual LED channel. The device includes thermal shutdown protection and is available in 16-lead TSSOP and SOIC packages, ensuring compliance with RoHS and being Pb-free, halogen-free, and BFR-free.
Key Specifications
| Parameter | Rating/Range | Units |
|---|---|---|
| VDD Supply Voltage | 3.0 to 5.5 | V |
| Logic Input/Output Voltage (SIN, SOUT, CLK, BLANK, LATCH) | −0.3 to VDD+0.3 | V |
| VLEDn Voltage | 0.4 to 5.5 | V |
| DC Output Current on LED1 to LED8 | 150 | mA |
| Storage Temperature Range | −55 to +160 | °C |
| Junction Temperature Range | −40 to +150 | °C |
| Lead Soldering Temperature (10 sec.) | 300 | °C |
| LED Current Range | 2 to 100 | mA |
| LED Dropout Voltage at 30 mA | 300 mV | mV |
| Thermal Shutdown Temperature | 160 | °C |
| Thermal Hysteresis | 20 | °C |
Key Features
- 8 Constant Current-sink Channels
- High-speed 4-wire Serial Interface up to 25 MHz Clock Frequency
- LED Current Range from 2 mA to 100 mA set by External RSET Resistor
- Low Output Voltage Operation: 0.4 V (for 2 to 100 mA LED current)
- Thermal Shutdown Protection
- Available in 16-lead TSSOP and SOIC Packages
- Pb-free, Halogen-free, and BFR-free
- RoHS Compliant
- Blanking Control Pin (BLANK) to Disable All Channels Independently
- Serial Output Data Pin (SOUT) for Cascading Multiple Devices
Applications
- Billboard Displays
- Marquee Displays
- Instrument Displays
- General Purpose Displays
Q & A
- What is the primary function of the CAT4008V-T1?
The CAT4008V-T1 is an 8-channel constant current driver for LEDs, designed for applications such as billboard and general display systems.
- How is the LED current controlled in the CAT4008V-T1?
The LED current is controlled using an external RSET resistor, which sets the current for all channels.
- What is the range of the supply voltage for the CAT4008V-T1?
The supply voltage range is from 3.0 V to 5.5 V.
- What is the maximum clock frequency of the serial interface?
The maximum clock frequency of the serial interface is 25 MHz.
- What is the purpose of the BLANK pin?
The BLANK pin is used to disable all LED channels simultaneously while maintaining the data in the latch register.
- What type of protection does the CAT4008V-T1 include?
The device includes thermal shutdown protection to disable the LED outputs if the die temperature exceeds 160°C.
- In what packages is the CAT4008V-T1 available?
The device is available in 16-lead TSSOP and SOIC packages.
- Is the CAT4008V-T1 RoHS compliant?
Yes, the CAT4008V-T1 is RoHS compliant and Pb-free, halogen-free, and BFR-free.
- How many channels does the CAT4008V-T1 support?
The CAT4008V-T1 supports 8 constant current-sink channels.
- What is the typical LED current accuracy of the CAT4008V-T1?
The LED current matching is typically ±1.5% of the average current.
