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Linear Lines Up Low Noise Boost Converters
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The new devices are suitable for applications such as OLED displays.
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Tuesday, July 29, 2008:
Linear Technology has announced the LT3495/-1 low noise boost converters with integrated power switches, Schottky diodes and output disconnect circuitry. LT3495 uses a 650mA switch whereas LT3495-1 uses a 350mA switch. Their wide 2.3V to 16V input voltage range enables them to operate from single cell Li-Ion batteries up to fixed 12V input rails, delivering outputs up to 40V. LT3495 can deliver over 70mA of output current at 16V from a single Li-Ion cell, making it suitable for applications such as OLED displays.
Both parts use a control technique that delivers both high efficiency and low output ripple over a wide load current range.
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This technique guarantees that the switching frequency stays above the audio band for the entire load range, making it suitable for noise-sensitive PMP and audio applications. The combination of the LT3495/-1’s 2mm x 3mm DFN package and tiny, low-cost ceramic capacitors and inductors provides a very compact solution footprint, Linear said.
The LT3495’s NPN switch achieves a VCESAT of 250mV at 500mA and offers efficiencies as high as 85 per cent. The device’s low 60uA of quiescent current (<1uA in shutdown) maximises battery run time, while integrated Schottky diodes and output disconnect circuitry minimises external circuitry. Finally, an integrated dimming/contrast adjustment function is included for display applications. For applications requiring output voltages below 10V, there are also 'B' versions of this device, LT3495B and LT3495B-1, which offer slightly higher light load efficiency.
The LT3495EDDB, LT3495EDDB-1, LT3495BEDDB and LT3495BEDDB-1 are all available in a 10-lead 2mm x 3mm DFN package. Pricing starts at $1.75 each for 1,000-piece quantities.
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