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PDF LM2796TL Data sheet ( Hoja de datos )
| Número de pieza | LM2796TL | |
| Descripción | Dual-Display White LED Driver with 3/2x Switched Capacitor Boost | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2796TL (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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February 2004
LM2796
Dual-Display White LED Driver with 3/2x Switched
Capacitor Boost
General 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 pulse-
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 3/2x-gain charge pump.
The LM2796 is available in National’s chip-scale 18-bump
micro SMD package.
Features
n Drives up to 7 LEDs with up to 20mA each
n LEDs controlled in 2 Distinct Groups, for Backlighting 2
Displays (main LCD and sub-LCD)
n Excellent Current and Brightness Matching
n High-Efficiency 3/2x Charge Pump
n Extended Li-Ion Input: 2.7V to 5.5V
n PWM Brightness Control: 100Hz - 1kHz
n 18-bump Thin Micro SMD Package:
(2.1mm x 2.4mm x 0.6mm)
Applications
n Mobile Phone Display Lighting
n Mobile Phone Keypad Lighting
n PDAs
n General LED Lighting
Typical Application Circuit
© 2004 National Semiconductor Corporation DS200938
20093801
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified: VIN = 3.6V; VDXX = 3.6V; V(EN) =
2.0V; V(ENA) = 2.0V; V(ENB) = 0V; RSET = 8.3 kΩ; CIN, C1, C2, and CPOUT = 1 µF.
LED Current vs. Input Voltage
LED Current vs. RSET Resistance
20093803
LED Current vs. PWM Duty Cycle,
PWM Applied to ENA and/or ENB
20093804
Charge Pump Output Resistance
vs. Ambient Temperature
20093805
20093806
5 www.national.com
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| PDF Descargar | [ Datasheet LM2796TL.PDF ] | |
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| LM2796TL | Dual-Display White LED Driver with 3/2x Switched Capacitor Boost | National Semiconductor |
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