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LM3570SD Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM3570SD
Descripción Electrónicos  Low Noise White LED Driver System
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3570SD Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM3570
Low Noise White LED Driver System
General Description
The LM3570 device provides a complete LED driver solution
for wireless handsets and other portable devices using a
display and keypad. With three constant current sources, up
to three white LEDs can be used for display lighting with
excellent current matching (0.3% typ.). The regulated 4.35V
output voltage is perfect for driving auxiliary keypad LEDs in
voltage mode.
The LM3570 utilizes a high efficiency 3/2 CMOS charge-
pump with a pre-regulation loop that minimizes conducted
noise on the input. It accepts an input voltage range from
2.7V to 5.5V and maintains a constant current determined by
the current through an external R
SET resistor.
The device supplies up to 80mA of total load current to
accommodate any combination of up to three white LEDs,
and additional current from V
OUT. The switching frequency is
set at 500kHz. (typ.) to keep the conducted noise spectrum
away from sensitive frequencies within portable RF devices.
By applying a pulse width modulated (PWM) signal to the
PWM pin, the user has the ability to independently control
the brightness of the regulated current source outputs with-
out shutting down the regulated output voltage.
Features
n
2.7V to 5.5V Input Voltage
n
Regulated Output Voltage (V
OUT = 4.35V)
n
Regulated I
Dx with ±0.3% matching between constant
current outputs
n
High Efficiency 3/2 Boost function
n
Drives one, two, or three white LEDs with no bias
resistor losses
n
Drives auxiliary keypad LEDS in voltage mode
n
Up to 80mA total output current
n
Active-High Enable
n
Active-High PWM Control Pin for independent control of
current sources
n
Very small solution size
n
1µA(max) shutdown current
n
500kHz switching frequency (typ.)
n
Linear regulation generates predictable noise spectrum
n
LLP-14 package: 4.0mm X 3.0mm X 0.8mm
Applications
n
Portable devices using white or blue LEDs with display
and backlight or frontlight
n
1-Cell LiIon battery-operated equipment including PDAs,
hand-held PCs and cellular phones
Typical Application Circuit
20085021
July 2004
© 2004 National Semiconductor Corporation
DS200850
www.national.com


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