CAT3636 Datasheet | Catalyst Semiconductor

FEATURES - - - - - - - - - - - - - - - - High efficiency 1.33x charge pump Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x Drives up to 6 LEDs at 32m A each 1-wire EZDim TM LED current programming Power efficiency up to 92% Low noise input ripple in all modes “Zero” current shutdown mode Soft start and current limiting Short circuit protection Thermal shutdown protection Tiny 3mm x 3mm, 16-lead TQFN package LCD Display Backlight Color RGB LEDs Cellular Phones Digital Still Cameras Handheld Devices DESCRIPTION The CAT3636 is a high efficiency quad-mode fractional charge pump that can drive up to six LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors. Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional charge pump supports a wide range of input voltages from 2.5V to 5.5V. The EN/SET logic input functions as a chip enable and a “1-wire” addressable interface for control and current setting of all LEDs. Three groups of two LEDs can be configured with independent LED currents between 0.25m A and 32m A. The device is available in a tiny 16-lead TQFN 3mm x 3mm package with a max height of 0.8mm. The 1.33x charge pump with two fly capacitors is a patent pending architecture exclusive to Catalyst Semiconductor. APPLICATIONS ORDERING INFORMATION Part Package Number CAT3636 TQFN-16 HV3-T2 3x3 Green - Matte Tin Lead Finish Quantity per Reel 2000 Package Marking JAAA For Ordering Information details, see page 14. PIN CONFIGURATION TYPICAL APPLICATION CIRCUIT © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice Doc. No. 5020 Rev. A .. CAT3636 ABSOLUTE MAXIMUM RATINGS Parameter VIN, LEDx, C1±, C2± voltage VOUT voltage EN/SET voltage Storage Temperature Range Junction...