LM2611BMF+ National Semiconductor, LM2611BMF+ Datasheet
LM2611BMF+
Manufacturer Part Number
LM2611BMF+
Description
Manufacturer
National Semiconductor
Datasheet
1.LM2611BMF.pdf
(15 pages)
Specifications of LM2611BMF+
Notes
NEW
Date_code
10+
© 2005 National Semiconductor Corporation
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
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
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:
Typical Application Circuit
IN(MAX)
Current Limit
R
DS(ON)
). The LM2611 utilizes an input and output inductor,
DS(ON)
FET.
Grade A
0.5Ω
1.2A
DS200181
Grade B
0.7Ω
0.9A
Features
n 1.4MHz switching frequency
n Low R
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:
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
DS(ON)
DMOS FET
<
1uA
20018117
January 2005
www.national.com
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