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Power/Alternative Energy??

Boost converters combine switches in mini package

Posted: 30 Jul 2008 ?? ?Print Version ?Bookmark and Share

Keywords:boost converter? power switches? Li-ion battery?

Linear Technology Inc. has launched the LT3495/-1 low-noise boost converters with integrated power switches, Schottky diodes and output-disconnect circuitry. The LT3495 employs a 650mA switch, whereas the LT3495-1 has a 350mA switch. Both parts are packaged in a 2mm x 3mm DFN-10 package. Their wide 2.3V to 16V input voltage range helps them to operate from single cell Li-ion batteries up to fixed 12V input rails, delivering outputs up to 40V. The LT3495 delivers over 70mA output current at 16V from a single Li-ion cell, which makes it ideal for applications like OLED displays. Both parts use a unique control technique that offers both high efficiency and low-output ripple over a wide load current range. This technique makes it possible that the switching frequency remains above the audio band for the whole load range, and suit noise-sensitive portable/personal media players and audio applications. The combination of the LT3495/-1's 2mm x 3mm DFN package and tiny, low-cost ceramic capacitors and inductors enables a very compact solution footprint.

The LT3495's NPN switch achieves a VCESAT of only 250mV at 500mA and offers efficiencies as high as 85 percent. Its low 60uA of quiescent current (The LT3495EDDB, LT3495EDDB-1, LT3495BEDDB and LT3495BEDDB-1 are all available from stock in a 10-lead 2mm x 3mm DFN package.

Feature summary of LT3495/-1/B/B-1:

??Low quiescent current
??60?A in active mode
??0.1?A in shutdown mode
??Low-noise control scheme (switching frequency always stays above audible range for LT3495/-1)
??Integrated power NPN
??650mA current limit (LT3495/B)
??350mA current limit (LT3495-1/B-1)
??Integrated Schottky diode
??Integrated output disconnect
??Integrated output dimming
??Wide input range: 2.3V to 16V
??Wide output range: up to 40V
??Integrated feedback resistor
??Tiny 10-lead 3mm x 2mm DFN package





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