The CAT4016 is a 16-channel constant current LED driver from Catalyst Semiconductor, Inc. The driver has 16 constant current sink channels and can output 2mA to 100mA of LED current. The output voltage is as low as 0.4V. The driver uses a high-speed 4-wire serial interface of up to 25MHz clock frequency to control each individual channel using a shift register and latch configuration. The driver also includes a blanking control pin (BLANK) that can be used to disable all channels independently of the interface. The driver also has thermal shutdown protection to disable the LED outputs if the die temperature exceeds a set limit.
The CAT4016 LED driver provides sixteen constant‑current sink channels that can be programmed via a single external RSET resistor. It operates from a 3.0 V to 5.5 V logic supply, supports LED currents from 2 mA to 100 mA, and includes thermal shutdown protection. A 4‑wire serial interface up to 25 MHz allows individual channel control and cascading of multiple devices.
Typical applications include billboard, marquee, instrument and general‑purpose displays. The device is offered in RoHS‑compliant 24‑lead SOIC, TSSOP, QSOP and 4 × 4 mm TQFN packages, with ordering information and pin‑out details provided in the later pages.
| Supply voltage (VDD) | 3.0 V to 5.5 V |
|---|---|
| LED current range | 2 mA to 100 mA |
| LED dropout voltage | 300 mV at 30 mA |
| Maximum LED channel current | 150 mA (absolute max) |
| Serial interface clock frequency | up to 25 MHz |
| Thermal shutdown | Enabled |
| Storage temperature range | -55 °C to +160 °C |
| Junction temperature range | -40 °C to +150 °C |
Each LED channel can handle up to 150 mA absolute maximum, with a typical programmable range up to 100 mA.
The LED current is set by an external RSET resistor; the current equals 50 times the current drawn from the RSET pin.
The serial interface can operate with a clock frequency up to 25 MHz.