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LM2611_05 数据手册 - National Semiconductor（美国国家半导体）
制造商:
National Semiconductor（美国国家半导体）
描述:
1.4MHz的转换器的Cuk 1.4MHz Cuk Converter
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3D模型
符号图
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LM2611_05数据手册
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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)
0.5Ω 0.7Ω
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 2005
LM2611 1.4MHz Cuk Converter
© 2005 National Semiconductor Corporation DS200181 www.national.com
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