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LM2611AMFX bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
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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
−(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
Grade B
Current Limit
1.2A
0.9A
R
DS(ON)
0.5
0.7
Features
n
1.4MHz switching frequency
n
Low R
DS(ON) DMOS FET
n
1mVp-p output ripple
n
−5V at 300mA from 5V input
n
Better regulation than a charge pump
n
Uses tiny capacitors and inductors
n
Wide input range: 2.7V to 14V
n
Low shutdown current: <1uA
n
5-lead SOT-23 package
Applications
n
MR Head Bias
n
Digital camera CCD bias
n
LCD bias
n
GaAs FET bias
n
Positive to negative conversion
Typical Application Circuit
20018117
January 2002
© 2002 National Semiconductor Corporation
DS200181
www.national.com


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