ON Semiconductor has introduced a new 6 W LED driver with an integrated, high-power DC-DC boost converter and on-chip diagnostics to maximize efficiency in larger, general purpose LCD panel backlighting applications.
As the company's first multi-channel boost device, the CAT4106 is capable of driving as many as 40 white LEDs - or four strings of 10 LEDs with up to 36 V per string - for a total of 6 W of LED output power. Additionally, the device enables designers to maximize backlighting efficiency and reduce space via its built-in diagnostics functions, which automatically adjust the output voltage to drive the highest forward voltage (Vf) string with the minimum head room voltage.
The on-chip diagnostic circuit allows designers to set the minimum and maximum voltage limits for the acceptable range of operation for LED strings through external programming resistors. Any channel which does not regulate within the set range of Open Circuit or Short Circuit LED will be detected and flagged on the FAULT logic output (active-low, open-drain). The device also provides thermal shutdown and overvoltage protection (OVP).
The CAT4106 features low dropout LED channels of 500 mV at 175 mA and a high-frequency pulse width modulation (PWM) interface, which supports multiple frequencies up to 2 kHz, providing precise, high-resolution dimming control while the device remains fully biased.
Four matched output LED channels
Integrated DC-DC boost converter
Up to 6 W LED total output power
Low dropout LED channels, 500 mV at 175 mA
High-frequency PWM interface, up to 2 kHz
On-chip diagnostics with adjustable Short/Open LED detection
Packaging: 16-lead TQFN, 4 mm x 4 mm 16-Lead TSSOP, 4.4 mm, exposed thermal pad
Availability and Pricing
The CAT4106 LED driver is available in a space-saving 4 mm x 4 mm 16-lead TQFN package and a 16-lead TSSOP package with an exposed thermal pad for enhanced power dissipation for $1.06 USD per unit in 10,000 unit quantities. Samples and evaluation boards are available now. Projected lead-time for production quantities is currently six to eight weeks ARO.