CAT3603 Datasheet | Catalyst Semiconductor

.. 3-Channel LED Driver in 3x3mm Package Features - - - - - - - - - - - - Drives up to 3 LEDs Current setting resistor patible with supply voltage of 3V to 5.5V Power efficiency up to 91% Output Current up to 30m A per LED Fractional pump 1x/1.5x Low noise input ripple Fixed High Frequency Operation 1MHz “Zero” Current Shutdown Mode Soft start and current limiting Short circuit protection 12-lead TDFN 3mm x 3mm package DESCRIPTION The CAT3603 is a charge pump LED driver operating in either 1x (LDO) mode or 1.5x fractional mode regulating current through each of the 3 LED pins. Operation at a constant switching frequency of 1MHz allows the use of very small value ceramic capacitors. The CAT3603 drives 3 white LEDs in parallel and provides tightly matched regulated current to achieve uniform brightness in LCD backlighting applications. An external resistor, RSET, controls the output current level. The device can deliver up to 30m A over an input voltage supply range from 3V to 5.5V, making it ideal for battery-powered applications LED dimming can be acplished using several methods; using a DC voltage to set the RSET pin current, applying a PWM signal on the EN pin, or adding a switched resistor in parallel with RSET. The EN input pin allows the device to be placed in powerdown mode with “near-zero” quiescent current. The device is available in the tiny 12-lead thin DFN 3mm x 3mm package with a max height of 0.8mm. APPLICATION - - - - LCD Display Backlight Cellular Phones Digital Still Cameras Handheld Devices ORDERING INFORMATION Part Number Package Quantity Package per Reel Marking 2000 HABB CAT3603HV2 TDFN-12 3x3 Green- - Lead Finish Matte-Tin For Ordering Information details, see page 11. PIN CONFIGURATION 12-lead TDFN 3mm (Top view) TYPICAL APPLICATION CIRCUIT Note: Unused LED channels must be connected to VOUT. © 2006 Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 5017 Rev....