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LM3570SD Datasheet

  • LM3570SD

  • National Semiconductor [Low Noise White LED Driver System]

  • NSC

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LM3570 Low Noise White LED Driver System
July 2004
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
鹵
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
1碌A(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
漏 2004 National Semiconductor Corporation
DS200850
www.national.com

LM3570SD 產品屬性

  • 顯示背光

  • 升壓

  • 3

  • 80mA

  • 4.35V

  • 2.7V 到 5.5V

  • PWM

  • -40°C 到 +85°C

  • LLP

  • 500kHz

  • No SVHC (19-Dec-2011)

  • 3570

  • LLP

  • -40°C

  • 85°C

  • 5.5V

  • 2.7V

  • 表面安裝

  • 4.35V

  • 14

  • 發(fā)光二極管

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