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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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LM2611BMFX Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM2611BMFX Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
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1 / 15 page  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 Ω 0.7 Ω 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 © 2005 National Semiconductor Corporation DS200181 www.national.com |
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