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CAT3626 Datasheet(PDF) 1 Page - Catalyst Semiconductor |
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CAT3626 Datasheet(HTML) 1 Page - Catalyst Semiconductor |
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1 / 15 page  CAT3626 © Catalyst Semiconductor, Inc. 1 Doc. No. MD-5014 Rev. D Characteristics subject to change without notice 6-Channel LED Driver with I 2C™ Interface FEATURES Drives 6 LED channels Independent current on 3 pairs of LEDs I 2C serial interface programming Adjustable current to 32mA in 0.5mA step 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 APPLICATIONS RGB LEDs LCD and keypad Backlighting Cellular Phones, PDAs Digital Cameras ORDERING INFORMATION Part Number Package Quantity per Reel Package Marking CAT3626HV4-T2 TQFN-16 (1) 2000 G626 CAT3626HV4-GT2 TQFN-16 (2) 2000 CDAJ Notes: (1) Matte-Tin Plated Finish (RoHS-compliant) (2) NiPdAu Plated Finish (RoHS-compliant) PRODUCT DESCRIPTION The CAT3626 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. The LED channels are configured into three indepen- dent pairs, each containing 2 matched channels. Each pair can be separately programmed from zero to 32mA, in 0.5mA resolution steps, using the I 2C serial interface. Any individual channel can be disabled while others remain active. When the enable input (EN) is low, the device is in shutdown mode drawing zero current. The device is available in a 16-pad TQFN package with a max height of 0.8mm. For Ordering Information details, see page 14. PIN CONFIGURATION TYPICAL APPLICATION CIRCUIT TQFN 16-pad 4 x 4mm (Top View) I 2C is a trademark of Philips Corporation. Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C bus protocol. 16 15 14 13 12 11 10 9 1 2 3 4 56 7 8 LEDA1 SDA SCL EN LEDC2 GND C2+ C2- LEDA2 LEDB1 LEDB2 LEDC1 VOUT VIN C1- C1+ GND VIN 3V to 5.5V LEDA1 LEDA2 LEDB1 LEDB2 LEDC1 LEDC2 EN CAT3626 VIN VOUT 1µF 1µF CIN C1+ C1- C2+ C2- SDA SCL 1µF 1µF 20mA pair A pair B pair C COUT ENABLE I2C Interface |
Número de pieza similar - CAT3626_08 |
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Descripción similar - CAT3626_08 |
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