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LM2795

更新时间： 2024-11-12 23:46:51
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September 2002  
LM2794/LM2795  
Current Regulated Switched Capacitor LED Supply with  
Analog Brightness Control  
General Description  
Features  
n Regulated IOUT with 0.5% matching between any two  
outputs  
The LM2794/95 is a fractional CMOS charge-pump and  
regulator that provides four regulated current sources. It  
accepts an input voltage range from 2.7V to 5.5V and main-  
tains a constant current determined by an external sense  
resistor.  
n High efficiency 3/2 boost function  
n Drives one, two, three or four white LEDs  
n 2.7V to 5.5V Input Voltage  
The LM2794/5 delivers up to 80mA of load current to accom-  
modate four White LEDs. The switching frequency is  
325kHz. (min.) to keep the conducted noise spectrum away  
from sensitive frequencies within portable RF devices. Maxi-  
mum operating current is 8.2mA (unloaded) and the maxi-  
mum shutdown current is only 5µA. If not all output pins are  
used, leave pin(s) unconnected.  
n Up to 80mA output current  
n Soft start limits inrush current  
n Analog brightness control  
n Active-low or high shutdown input (’94/95)  
n Very small solution size and no inductor  
n 5µA (max.) shutdown current  
n 325kHz switching frequency (min.)  
n Linear regulation generates predictable noise spectrum  
n micro SMD-14 package: 2.08mm X 2.403mm X  
0.845mm  
Brightness can be controlled by both linear and PWM tech-  
niques. A voltage between 0V and 3.0V may be applied to  
the BRGT pin to vary the current over more than a 5 to 1  
ratio. Output current will linearly track the voltage applied to  
the BRGT pin. Alternatively, a PWM signal can be applied to  
the SD pin to vary the perceived brightness of the LED. The  
SD pin reduces the operating current to 5µA (max.) The  
LM2794 uses an active-low shutdown level, and the LM2795  
uses an active-high shutdown level.  
Applications  
n White LED Display Backlights  
n White LED Keypad Backlights  
n 1-Cell Li-Ion battery-operated equipment including  
PDAs, hand-held PCs, cellular phones  
n Flat Panel Displays  
The LM2794/95 is available in a micro SMD-14 CSP pack-  
age.  
Basic Application Circuit  
20028503  
© 2002 National Semiconductor Corporation  
DS200285  
www.national.com  
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