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CAT3626 Datasheet(PDF) 9 Page - Catalyst Semiconductor |
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CAT3626 Datasheet(HTML) 9 Page - Catalyst Semiconductor |
9 / 15 page CAT3626 © Catalyst Semiconductor, Inc. 9 Doc. No. MD-5014 Rev. D Characteristics subject to change without notice BLOCK DIAGRAM Figure 2. CAT3626 Functional Block Diagram BASIC OPERATION At power-up, the CAT3626 starts operating in 1x mode where the output will be approximately equal to the input supply voltage (less any internal voltage losses). If the output voltage is sufficient to regulate all LEDs currents the device remains in 1x operating mode. If the input voltage is insufficient or falls to a level where the regulated currents cannot be maintained, the device automatically switches (after a fixed time of 400µs) into 1.5x mode. In 1.5x mode, the output is approximately equal to 1.5 times the input supply voltage (less any internal voltage losses). The above sequence is repeated each and every time the chip is either powered-up or taken out of shutdown (via EN pin), or the RegEn register is accessed by write cycle. LED CURRENT SETTING The LED current setting is programmed via the I 2C serial interface and is stored in four 8-bit registers RegA, RegB, RegC and RegEn as follows: RegA stores the LED current for group A (LEDA1 and LEDA2 channels), RegB stores the LED current for group B (LEDB1 and LEDB2 channels), RegC stores the LED current for group C (LEDC1 and LEDC2 channels), RegEn selects the on/off state of each of the 6 LED channels. At each write access to RegEn, the driver automatically reconfigures to the mode (1x or 1.5x) that provides the highest efficiency. Mode Control 1MHz Oscillator Current Setting DAC Serial Interface Registers Reference Voltage 1x mode (LDO) 1.5x Charge Pump VIN C1- C2- C1+ C2+ VOUT COUT CIN 1µF 1µF 1µF 1µF EN LEDA1 LEDA2 LEDB1 LEDB2 LEDC1 LEDC2 GND 6 Current Sink Regulators SDA SCL |
Similar Part No. - CAT3626_08 |
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Similar Description - CAT3626_08 |
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