The LM2796 is a charge-pump based white-LED driver that is ideal for mobile phone display
backlighting. It can drive up to 7 LEDs in parallel with up to 20mA 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 (3 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
The LM2796 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 LM2796 is available in TI’s chip-scale 18-bump DSBGA package.
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