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LM2611AMFX Datasheet

  • LM2611AMFX

  • 1.4MHz Cuk Converter

  • 13頁

  • NSC

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LM2611 1.4MHz Cuk Converter
January 2002
LM2611
1.4MHz Cuk Converter
General Description
The LM2611 is a current mode, PWM inverting switching
regulator. Operating from a 2.7 - 14V supply, it is capable of
producing a regulated negative output voltage of up to
鈭?36-V
IN(MAX)
). The LM2611 utilizes an input and output
inductor, which enables low voltage ripple and RMS current
on both the input and the output. With a switching frequency
of 1.4MHz, the inductors and output capacitor can be physi-
cally small and low cost. High efficiency is achieved through
the use of a low R
DS(ON)
FET.
The LM2611 features a shutdown pin, which can be acti-
vated when the part is not needed to lower the Iq and save
battery life. A negative feedback (NFB) pin provides a simple
method of setting the output voltage, using just two resistors.
Cycle-by-cycle current limiting and internal compensation
further simplify the use of the LM2611.
The LM2611 is available is a small SOT23-5 package. It
comes in two grades:
Grade A
Current Limit
R
DS(ON)
1.2A
0.5鈩?/div>
Grade B
0.9A
0.7鈩?/div>
Features
n
n
n
n
n
n
n
n
n
1.4MHz switching frequency
Low R
DS(ON)
DMOS FET
1mVp-p output ripple
鈭?V at 300mA from 5V input
Better regulation than a charge pump
Uses tiny capacitors and inductors
Wide input range: 2.7V to 14V
Low shutdown current:
<
1uA
5-lead SOT-23 package
Applications
n
n
n
n
n
MR Head Bias
Digital camera CCD bias
LCD bias
GaAs FET bias
Positive to negative conversion
Typical Application Circuit
20018117
漏 2002 National Semiconductor Corporation
DS200181
www.national.com

LM2611AMFX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 14 V

  • 1400 KHz

  • - 1.23 V to - 36 V

  • 1

  • + 125 C

  • SMD/SMT

  • SOT-23

  • - 40 C

  • Reel

  • 3000

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