EUP2796 Datasheet | Eutech Microelectronics

DESCRIPTION The EUP2796 is a charge-pump based white-LED driver that is ideal for mobile phone display backlighting. It can drive up to 6 LEDs in parallel with up to 20m A through each LED. Regulated internal current sources deliver excellent current and brightness matching in all LEDs. The LED-driver current sources are split into two independently controlled groups. The primary group (4 LEDs) can be used to backlight .. the main phone display. The second group (2 LEDs) can be used to backlight a secondary display or to provide other lighting features (keypad LEDs, for example). Brightness of the two groups can be adjusted independently with pulse-width modulated (PWM ) digital signals. The EUP2796 works off an extended Li-Ion input voltage range (2.7V to 5.5V). Voltage boost is achieved with a high-efficiency 3/2- gain charge pump. The EUP2796 is available in a 16-pin TQFN package. FEATURES z z Drives up to 6 LEDs with up to 20m A each LEDs controlled in 2 Distinct Groups, for Backlighting 2 Displays (main LCD and sub-LCD) Excellent Current and Brightness Matching High Efficiency 3/2X Charge Pump Extended Li-Ion Input: 2.7V to 5.5V PWM Brightness Control: 100Hz - 1k Hz 3mm × 3mm TQFN-16 Package Ro HS pliant and 100% Lead(Pb)-Free z z z z z z APPLICATIONS z z z z Mobile Phone Display Lighting Mobile Phone Keypad Lighting PDAs General LED Lighting Typical Application Circuit Figure 1. DS2796 Ver1.0 Feb. 2007 Pin Configurations Package Type Pin Configurations TQFN-16 .. Pin Description PIN C2P POUT ISET ENS Pin 1 2 3 4 DESCRIPTION Positive terminal of C2 Charge pump output Current sense input. Connect 1% resistor to ground to set constant current through LED Enable for Group-B LEDs (D5~D6). Logic input High=Group-B LEDs ON. Low=Group B LEDs OFF. Pulsing this pin with a PWM signal (100Hz-1k Hz) can be used to dim LEDs. Enable for Group-A LEDs (D1~D4). Logic input High=Group-A LEDs ON. Low=Group A LEDs OFF. Pulsing this pin with a PWM signal (100Hz-1k Hz)...