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LM3590

更新时间: 2024-11-17 22:51:55
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美国国家半导体 - NSC 驱动器
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9页 204K
描述
LM3590Series White LED Driver

LM3590 数据手册

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November 2003  
LM3590  
Series White LED Driver  
General Description  
The LM3590 is a White LED constant current driver capable  
of supplying up to 3 White LEDs connected in series with  
20mA. This device operates over a wide 6V-12.6V input  
voltage range. The output can accomodate LEDs with a  
combined forward voltage of up to 11.5V, from a 12V input  
supply. The LED drive current is programmed by using an  
external resistor on the ISET pin.  
Features  
n Drives up to 3 stacked white LEDs  
n 6.0V-12.6V input voltage range  
n Up to 20mA LED output current  
n Excellent LED current matching guaranteed by series  
configuration  
n Single connection to the White LEDs in the display  
module  
LED brightness can be linearly varied up to the programmed  
LED current by applying a Pulse Width Modulated (PWM)  
signal to the EN pin of the device. The LED output current of  
the LM3590 is tightly controlled over temperature and volt-  
age. LED Current matching is guaranteed due to the series  
configuration of the LEDs. The series topology also simpli-  
fies the connection between the White LEDs in the display  
n Tightly controlled programmable current source  
n Low shutdown current (0.1µA typ.)  
n PWM brightness control  
n Very small solution size  
n SOT23-5 package: 3mm x 3mm x 1.0mm (LxWxH)  
module and the LM3590 since only one connection is re- Applications  
quired.  
n White LED Display Backlights  
n Keypad Backlights  
n General purpose constant current driver for high  
forward-voltage LEDs  
The LM3590 typically draws only 50µA when operating in the  
no-load condition and draws less than 0.1µA when the de-  
vice is shut down.  
The LM3590 is available in a small 5-pin SOT23 package.  
Typical Application Circuit  
20081301  
20081305  
© 2003 National Semiconductor Corporation  
DS200813  
www.national.com  

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