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PDF LM2793 Data sheet ( Hoja de datos )
| Número de pieza | LM2793 | |
| Descripción | Low Noise White LED Constant Current Supply with Dual Function Brightness Control | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM2793 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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February 2003
LM2793
Low Noise White LED Constant Current Supply with
Dual Function Brightness Control
General Description
The LM2793 is a highly efficient, semi-regulated 1.5x CMOS
charge pump that provides dual constant current outputs.
The LM2793 has an input voltage range of 2.7V to 5.5V.
To control LED brightness, the amount of current driven to
the current-mode outputs can be adjusted with an analog
voltage and/or a pulse-width-modulated (PWM) square
wave.
Pre-regulation of the charge pump minimizes conducted
noise on the input. Combined with a fixed switching fre-
quency of 500kHz, the LM2793 is a low-noise solution.
The LM2793 is available in a 10-pin Leadless Lead-frame
package: LLP-10.
Features
n Two Regulated Current Outputs, up to 16mA Each,
Matched to Within ±0.3% (typ.)
n High Efficiency, 1.5x Regulated Charge Pump
n Input Voltage Range: 2.7V to 5.5V
n Soft Start Limits Inrush Current
n Analog Voltage Brightness Control
n PWM Brightness Control
n Very Small Solution Size - NO INDUCTOR
n 500kHz Switching Frequency
n 3µA (typ.) Shutdown Current
n LLP-10 Package: 3.0mm X 3.0mm X 0.8mm
Applications
n White LED Display Backlights
n White LED Keypad Backlights
n 1-Cell LiIon Battery-Operated Equipment Including
PDAs, Hand-held PCs, Cellular Phones
n Flat Panel Displays
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200636
20063602
www.national.com
1 page  
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, 2 LEDs, VDX = 3.6V,
VIN = 3.6, VSD-BRGT = 3.0, C1 = C2 = CIN = CHOLD = 1µF. Capacitors are low-ESR multi-layer ceramic capacitors (MLCC’s).
LED Current vs. Input Voltage
LED Current vs. SD-BRGT Voltage
20063606
Efficiency vs. Input Voltage
20063607
LED Current vs. LED Voltage
20063612
Quiescent Current vs. Input Voltage
20063608
Shutdown Supply Current vs. Input Voltage
20063609
5
20063610
www.national.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LM2793.PDF ] | |
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