CAT3614 Datasheet | Catalyst Semiconductor

.. 4-Channel 1-Wire LED Driver in 3x3mm Package Features - - - - - - - - - - - - Drives up to 4 LED channels 1-wire EZDim TM Programmable LED Current Accurate 1m A Dimming Level Power efficiency up to 91% 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 Thermal shutdown protection 12-lead TDFN 3mm x 3mm package DESCRIPTION The CAT3614 is a high efficiency 1x/1.5x fractional charge pump with programmable dimming current in four LED channels. To ensure uniform brightness in LCD backlight applications, each LED channel delivers an accurate regulated current. Low noise and input ripple is achieved by operating at a constant switching frequency of 1MHz which allows the use of small external ceramic capacitors. The 1x/1.5x fractional charge pump supports a wide range of input voltages from 3V to 5.5V with efficiency up to 91%, and is ideal for Li-Ion battery powered devices. The EN/DIM logic input provides a 1-wire EZDim TM interface for dimming control of the LEDs. When enabled, a series of clock pulses reduces the LED brightness in 1m A steps on each negative going edge. Currents from 0m A to 31m A are supported. The device is available in the tiny 12-lead thin DFN 3mm x 3mm package with a max height of 0.8mm. APPLICATIONS - LCD Display Backlight - Cellular Phones - Digital Still Cameras - Handheld Devices ORDERING INFORMATION Part Number CAT3614HS2-T2 CAT3614HV2-T2 Package TDFN-12 3x3 TDFN-12 3x3 Green Quantity per Reel 2000 2000 Package Marking HAAB HAAA Pin Configuration Top View Typical Application Circuit 12-lead TDFN 3mm x 3mm Note: Unused LED channels must be connected to VOUT. © 2006 Catalyst Semiconductor, Inc. Doc. No. 25095, Rev. 01 Characteristics subject to change without...