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PDF EUP2796 Data sheet ( Hoja de datos )
| Número de pieza | EUP2796 | |
| Descripción | Dual-Display White LED Driver | |
| Fabricantes | Eutech Microelectronics | |
| Logotipo |  |
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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
www.DtahteaSmheaeint4Up.hcoomne 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
1 page  
Typical Operating Characteristics
16.25
LED Current vs VIN
16.00
15.75
15.50
15.25
15.00
14.75
14.50
2.7 3.2
www.DataSheet4U.com
3.7 4.2 4.7
Pow er Supply (V)
TA=25
5.2 5.7
EUP2796
Vset vs Power Supply
1.20
1.19
1.18
1.17
1.16
2.7 3.2 3.7 4.2 4.7 5.2 5.7
Pow er Supply (V)
30.00
25.00
20.00
15.00
10.00
5.00
0.00
0
LED Current vs RSET
20 40 60 80
RSET Resistance (kΩ)
100
20.00
Head Room Voltage vs LED Current
15.00
10.00
5.00
0.00
0
0.1 0.2 0.3 0.4
Head Room Voltage
0.5
Efficient vs Supply Voltage
Driving Six WLEDs (Rset=7.5KΩ, VLED=3.6V)
100
90
80
70
60
50
40
30
20
2.7 3.1 3.5 3.9 4.3 4.7
Supply Voltage(V)
DS2796 Ver1.0 Feb. 2007
5
Input Current vs. Supply Voltage
Driving Six WLEDs (Rset=7.5KΩ, VLED=3.6V
160
150
140
130
120
110
100
90
80
2.7 3.1 3.5 3.9 4.3 4.7
Supply Voltage(V)
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet EUP2796.PDF ] | |
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