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CAT3644 Datasheet(PDF) 8 Page - Catalyst Semiconductor |
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CAT3644 Datasheet(HTML) 8 Page - Catalyst Semiconductor |
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8 / 14 page  CAT3644 Doc. No. 5023, Rev. B 8 © 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice PIN DESCRIPTION Pin # Name Function 1 LED2 LED2 cathode terminal. 2 LED3 LED3 cathode terminal. 3 LED4 LED4 cathode terminal. 4 RSET Connect resistor RSET to set the LED current. 5 EN/DIM Device enable (active high) and Dimming Control. 6 VOUT Charge pump output connected to the LED anodes. 7 NC Not connected inside the package. 8 VIN Charge pump input, connect to battery or supply. 9 C1+ Bucket capacitor 1 Positive terminal 10 C1- Bucket capacitor 1 Negative terminal 11 C2+ Bucket capacitor 2 Positive terminal 12 C2- Bucket capacitor 2 Negative terminal 13 NC Not connected inside the package. 14 NC Not connected inside the package. 15 GND Ground Reference 16 LED1 LED1 cathode terminal. TAB GND Connect to GND on the PCB. PIN FUNCTION VIN is the supply pin for the charge pump. A small 1μF ceramic bypass capacitor is required between the VIN pin and ground near the device. The operating input voltage range is from 2.5V to 5.5V. Whenever the input supply falls below the under-voltage threshold (1.8V), all the LED channels are disabled and the device enters shutdown mode. EN/DIM is the enable and one wire dimming input for all LED channels. Levels of logic high and logic low are set at 1.3V and 0.4V respectively. When EN/DIM is initially taken high, the device becomes enabled and all LED currents are set to the full scale according to the resistor RSET. To place the device into “zero current” shutdown mode, the EN/DIM pin must be held low for at least 1.5ms. VOUT is the charge pump output that is connected to the LED anodes. A small 1μF ceramic bypass capacitor is required between the VOUT pin and ground near the device. GND is the ground reference for the charge pump. The pin must be connected to the ground plane on the PCB. C1+, C1- are connected to each side of the ceramic bucket capacitor C1. C2+, C2- are connected to each side of the ceramic bucket capacitor C2. LED1 to LED4 provide the internal regulated current source for each of the LED cathodes. These pins enter high-impedance zero current state whenever the device is placed in shutdown mode. TAB is the exposed pad underneath the package. For best thermal performance, the tab should be soldered to the PCB and connected to the ground plane. RSET is connected to the resistor (RSET) to set the full scale current for the LEDs. The voltage at this pin regulated to 0.6V. The ground side of the external resistor should be star connected back to the GND of the PCB. In shutdown mode, RSET beomes high impedance. |
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