EUP2796
Dual-Display White LED Driver with 3/2X
Switched Capacitor Boost
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 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 (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
Drives up to 6 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
3mm
×
3mm
TQFN-16 Package
RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
Mobile Phone Display Lighting
Mobile Phone Keypad Lighting
PDAs
General LED Lighting
Typical Application Circuit
Figure 1.
DS2796
Ver1.0
Feb. 2007
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
