Catalyst Semiconductor, Inc. a supplier of analog, mixed-signal and non-volatile memory semiconductors, has expanded its line of patented Quad-Mode fractional charge pump LED drivers with a new device optimized for portable products. The new CAT3637 addresses the requirements for high-efficiency and easy LED programming in these products, with 10 percent higher efficiency (compared to three-mode charge pumps) and a simple, 1-wire EZDim interface control.

The CAT3637 is optimized for applications with one bank of five or six identical LED channels, a typical configuration for larger LED screen portable products. The device incorporates a simplified version of Catalyst' already easy-to-use, 1-wire EZDim interface, which supports 16 output power levels, from zero to 30mA full brightness 2mA resolution steps. With efficiency levels as high as 92 percent, no added capacitors required, and a tiny 3 x 3mm, low-profile TQFN package, the Quad-Mode CAT3637 saves significant board space and costs in next-generation portable products.

The CAT3637 joins the following devices in Catalyst'Quad-Mode family of LED drivers: the CAT3604V four-channel LED driver with PWM dimming interface; and the CAT3636 six-channel, CAT3644 four-channel and CAT3643 three-channel devices with 1-wire EZDim interface.

Product Features

Patented Quad-Mode high-efficiency charge pump switching architecture
Easy-to-use, 1-Wire EZDim interface control
Fourth charge pump mode achieves 1.33x boost mode with only 2 flying capacitors
Power efficiency up to 92 percent
Drives up to 6 LEDs at 30mA each, in 2mA steps
Fully protected
Packaging: 16-pad TQFN, 3mm x 3mm

The CAT3637 joins the following devices in Catalyst'Quad-Mode family of LED drivers: the CAT3604V four-channel LED driver with PWM dimming interface; and the CAT3636 six-channel, CAT3644 four-channel and CAT3643 three-channel devices with 1-wire EZDim interface.