Commercial LED Driver Chips
Many LEDs, such as the seven-segment display, are common-anode LEDs. The LEDs anode connects to VCC and each cathode connects to an output pin of the current-sinking LED driver chip. The driver chip sinks the DC current required to drive the display, and the LED turns on when the driver chip's output pins drive low. Current-regulating circuits are implemented inside the LED driver chips.
Current-sinking LED drivers are more common than current-sourcing drivers.
| LED Driver Chip | Description |
|---|---|
| Texas Instruments | |
| TLC5905 | LED driver with shift registers, data latch, and constant current circuitry |
| TLC5910 | LED driver with shift registers, data latch, on-chip phase-locked loop (PLL) for gray scale generation and constant current |
| TLC5911 | LED driver with shift registers, data latch, on-chip PLL for gray scale generation and constant current |
| TLC5921 | LED driver with shift register, data latch, and current-sink constant current circuitry |
| National Semiconductor | |
| DS8874 | 9-digit shift input LED driver |
| DS8863 | MOS-to-LED 8-digit driver |
| DS8963 | MOS-to-LED 8-digit driver |
| Toshiba | |
| TB62701AN | 16-bit constant current LED driver with shift register and latch functions |
| TB62705 | 8-bit constant current LED driver with shift register and latch functions |
| TB62706 | 16-bit constant current LED driver with shift register and latch functions |
| TB62707 | 8-bit constant current LED driver with latch functions |