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CAT3616HV4-T2 Datasheet(PDF) 1 Page - Catalyst Semiconductor |
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CAT3616HV4-T2 Datasheet(HTML) 1 Page - Catalyst Semiconductor |
1 / 14 page CAT3616 © 2006 Catalyst Semiconductor, Inc. 1 Doc. No. 5018 Rev. A Characteristics subject to change without notice 6-Channel Charge Pump LED Driver with EZDimTM FEATURES 6 LED channels with tight matching Independent Main and Sub channels 1-wire EZDim TM Programmable LED Current Accurate 1mA 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 RoHS-compliant 16-lead Thin QFN 4mm x 4mm package APPLICATION Main and sub-display backlight Color LCD and keypad Backlighting Cellular Phones Handheld Devices Digital Cameras DESCRIPTION The CAT36 16 is a high efficiency 1x/1.5x fractional charge pump with programmable dimming current in six 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. Two groups of LEDs, main (MAIN1 to MAIN4) and sub (SUB1 and SUB2) are programmable through the ENM ¯¯¯ (active low) and ENS ¯¯¯ inputs. Independent current from 1mA to 31mA with a 1mA step are set by toggling the ENM ¯¯¯ and ENS ¯¯¯ inputs. The enable EN input pin allows to shutdown the device with zero quiescent current. The device is available in a 16-lead thin QFN package with a max height of 0.8mm. ORDERING INFORMATION Part Number Package Quantity per Reel Package Marking CAT3616HV4 Thin QFN-16 Green* 2000 G616 *Lead Finish Matte-Tin For Ordering Information details, see page 13. PIN CONFIGURATION TYPICAL APPLICATION CIRCUIT TQFN 16-lead 4x4mm (Top view) Note: Unused LED channels must be connected to VOUT. |
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