1FEATURES
2• Drives up to 7 LEDs with up to 20mA 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 - 1kHz
• 18-bump Thin DSBGA Package: (2.1mm x
2.4mm x 0.6mm)

pulseAPPLICATIONS
• Mobile Phone Display Lighting
• Mobile Phone Keypad Lighting
• PDAs
• General LED Lighting

DESCRIPTION
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 pulseAPPLICATIONS
width modulated (PWM) digital signals.
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.