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LM2791 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2791
Description  Current Regulated Switched Capacitor LED Driver with Analog Brightness Control
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM2791 Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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LM2791
Current Regulated Switched Capacitor LED Driver with
Analog Brightness Control
General Description
The LM2791 is a CMOS charge-pump voltage doubler and
regulator that provides two regulated current sources. The
LM2791 is designed to drive two white (or blue) LEDs with
matched currents (within ± 0.3%) to produce balanced light
sources for display backlights. They accept an input voltage
range from 3V to 5.8V and maintain a constant current
determined by an external set resistor.
The LM2791 delivers up to 36mA of load current to accom-
modate two high forward voltage (typically white) LEDs. The
switching frequency is 450kHz (min.) to keep the conducted
noise spectrum away from sensitive frequencies within por-
table RF devices.
In the LM2791, brightness is controlled by applying a voltage
between GND and 3.0V to the BRGT pin. The LM2791 is
available in active high or low shutdown versions. The shut-
down pin reduces the operating current to 1µA (max.).
The LM2791 is available in a 10 pin leadless leadframe
(LLP) CSP package.
Features
n
Output matching of ± 0.3%
n
Drives up to two LED’s
n
3V to 5.8V Input Voltage
n
Up to 36mA output current
n
Soft start limits inrush current
n
Analog brightness control
n
Separate shutdown input
n
Very small solution size - no inductor
n
0.7mA typical operating current
n
1µA (max.) shutdown current
n
450kHz switching frequency (min.)
n
Linear regulation generates predictable noise spectrum
n
LLP-10 package: 3mm X 3mm X 0.8mm
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 Dispalys
Basic Application Circuit
20018301
July 2002
© 2002 National Semiconductor Corporation
DS200183
www.national.com


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