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LM2753 датащи(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
номер детали LM2753
подробное описание детали  High Power Switched Capacitor Voltage Convertor/Flash LED Driver
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2753 датащи(HTML) 1 Page - National Semiconductor (TI)

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LM2753
High Power Switched Capacitor Voltage Convertor/Flash
LED Driver
General Description
The LM2753 is capable of driving a Flash LED with a pulsed
current of 400mA at an input voltage of 3.6V. A switched
capacitor doubler, the LM2753 provides a regulated 5V out-
put (V
OUT) over an input supply range of 3.0V to 5.5V. The
switched output, I
OUT, takes less than 10ns to turn on and
provide maximum current to a Flash LED. Flash LED current
is set via a ballast resistor. Continuous illumination current
(Torch Mode) is programmed by connecting a resistor be-
tween I
OUT and VOUT. This device uses only three small,
low-cost ceramic capacitors.
LM2753 uses Pulse Frequency Modulation (PFM) regula-
tion. Typical operating frequency is 725kHz. Under no-load
conditions, LM2753 operates on only 60µA. If the output is
connected to ground, the charge pump stays in the gain of 1
which helps limit the input current to 300mA (typ.)
LM2753 is available in a 10-pin No Pullback Leadless Lead-
frame Package: LLP-10.
Features
n
Input Voltage Range: 3.0V to 5.5V
n
Regulated 5V Output
n
250mA Output Current with a 3.6V input
n
400mA Pulsed Output Current (up to 500ms duration)
n
60µA (typ.) Quiescent Current
n
PFM Regulation
n
Inductor-less solution: requires only 3 small capacitors
n
<1µA Typical Shutdown Current
n
10-pin LLP Package (No Pullback):
3mm x 3mm x 0.75mm
Applications
n
Cell Phone Camera Flash
n
General Purpose Regulated Voltage Output, High
Current Supply
Typical Application Circuit
20140601
February 2005
© 2005 National Semiconductor Corporation
DS201406
www.national.com


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