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CAT3606 Datasheet(PDF) 1 Page - Catalyst Semiconductor |
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CAT3606 Datasheet(HTML) 1 Page - Catalyst Semiconductor |
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1 / 12 page  CAT3606 © Catalyst Semiconductor, Inc. 1 Doc. No. MD-5009 Rev. C Characteristics subject to change without notice 6-Channel Low Noise Charge Pump White LED Driver FEATURES Drives up to 4 main LEDs and 2 sub LEDs Separate control for main and sub LEDs Compatible with supply voltage of 3V to 5.5V Power efficiency up to 90% Output current up to 30mA per LED High-frequency Operation at 1MHz 2 modes of operation 1x and 1.5x White LED detect circuitry on all channels Shutdown current less than 1µA Small ceramic capacitors Soft start and current limiting Short circuit protection 16-pad TQFN package, 0.8mm max height APPLICATION Cell phone main and sub-display backlight Navigation PDAs Digital Cameras ORDERING INFORMATION Part Number Package Quantity per Reel Marking CAT3606HV4-T2 TQFN-16 (1) 2000 G366 CAT3606HV4-GT2 TQFN-16 (2) 2000 CDBB Notes: (1) Matte-Tin Plated Finish (RoHS-compliant). (2) NiPdAu Plated Finish (RoHS-compliant). DESCRIPTION The CAT3606 controls up to four LEDs for the main display and two LEDs for the sub-display in cellular phones. The device is capable of operating in either 1x (LDO) mode or 1.5x charge pump mode. All LED pin currents are regulated and tightly matched to achieve uniformity of brightness across the LCD backlight. An external resistor (RSET) sets the nominal output current. The device can deliver as much as 20mA per channel during low voltage operation (3V), and 30mA per channel during nominal operation (3.3V). A constant high-frequency switching scheme (1MHz) provides low noise and allows the use of very small value ceramic capacitors.. A “zero” quiescent current mode can be achieved via the chip enable pin EN. The Main and Sub LEDs each have their own dedicated ON/OFF control pins ENM ¯¯¯, ENS ¯¯¯ Dimming can be achieved using either a DC voltage to control the RSET pin current, or by applying a PWM signal on the ENM ¯¯¯ and ENS ¯¯¯ pins. The device is available in a 16-pad TQFN package with a max height of 0.8mm. TYPICAL APPLICATION CIRCUIT For Ordering Information details, see page 11. CAT3606 + - C1+ C2+ C1- RSET 24kΩ 1µF 1µF C2- VIN EN ENM ENS RSET VOUT LED1 LED2 LED3 LED4 LED5 LED6 20mA Li-Ion Battery ON/OFF ENABLE LED1-4 ENABLE LED5-6 CIN GND Main Display Sub Display COUT 1µF 1µF |
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