EUP2796 Datasheet, PDF (1/9 Pages) Eutech Microelectronics Inc – Dual-Display White LED Driver with 3/2X Switched Capacitor Boost

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
z Drives up to 6 LEDs with up to 20mA each
z LEDs controlled in 2 Distinct Groups, for
Backlighting 2 Displays (main LCD and
sub-LCD)
z Excellent Current and Brightness Matching
z High Efficiency 3/2X Charge Pump
z Extended Li-Ion Input: 2.7V to 5.5V
z PWM Brightness Control: 100Hz - 1kHz
z 3mm × 3mm TQFN-16 Package
z RoHS Compliant and 100% Lead(Pb)-Free
APPLICATIONS
z Mobile Phone Display Lighting
z Mobile Phone Keypad Lighting
z PDAs
z General LED Lighting
Typical Application Circuit
DS2796 Ver1.0 Feb. 2007
Figure 1.
1