LM3590 Datasheet, PDF (1/9 Pages) National Semiconductor (TI) – LM3590Series White LED Driver

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 I_SET pin.
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
module and the LM3590 since only one connection is re-
quired.
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.
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
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)
Applications
n White LED Display Backlights
n Keypad Backlights
n General purpose constant current driver for high
forward-voltage LEDs
Typical Application Circuit
20081301
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