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LM2611BMF fiches techniques PDF

National Semiconductor - 1.4MHz Cuk Converter

Numéro de référence LM2611BMF
Description 1.4MHz Cuk Converter
Fabricant National Semiconductor 
Logo National Semiconductor 





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LM2611BMF fiche technique
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
−(36-VIN(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 RDS(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:
Current Limit
RDS(ON)
Grade A
1.2A
0.5
Grade B
0.9A
0.7
Features
n 1.4MHz switching frequency
n Low RDS(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
© 2002 National Semiconductor Corporation DS200181
20018117
www.national.com

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