CAT3643 Datasheet | Catalyst Semiconductor

3-Channel Ultra High Efficiency Quad-Mode™ LED Driver Features - High efficiency 1.33x charge pump - Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x - Drives up to 3 LEDs at 32m A each - 1-wire EZDim™ 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 12-lead XQFN, 12-lead TDFN and 16-lead TQFN packages DESCRIPTION The CAT3643 is a high efficiency quad-mode fractional charge pump that can drive up to three 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 2.4V to 5.5V. The EN/DIM logic input functions as a chip enable and a digital dimming interface for current setting of all LEDs. Six different current ratios are available via the interface. The device is available in the tiny 12-lead XQFN 2.5 x 2.5mm with max height of 0.4mm or in 16-lead TQFN or 12-lead TDFN 3mm x 3mm package with a max height of 0.8mm. The 1.33x charge pump architecture with two fly capacitors is patent pending. Package Marking HABF JAAE (1) (1) APPLICATION - LCD Display Backlight - Cellular Phones - Digital Still Cameras - Handheld Devices .. ORDERING INFORMATION Part Number CAT3643HV2-T2 CAT3643HV3-T2 Package TDFN-12 3 x 3mm(1) TQFN-16 3 x 3mm CAT3643HL1-T2 XQFN-12 2.5 x 2.5mm Notes: (1) Matte-Tin Plated Finish (Ro HS-pliant) (2) Quantity per reel is 2000 TYPICAL APPLICATION CIRCUIT 1µF 1µF VIN 2.4V to 5.5V CIN 1µF C1+...