Linear Tech Adds MicroPower Boost Converters With Output Disconnect In 2 x 3mm DFN Package
Linear Technology announced the LT3495/-1 low noise boost converters with integrated power switches, Schottky diodes and output disconnect circuitry. The LT3495 uses a 650mA switch whereas the LT3495-1 uses a 350mA switch. Both parts are packaged in a 2 x 3mm DFN-10 package. Their wide 2.3 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.
The LT3495 can deliver over 70mA of output current at 16V from a single Li-Ion cell, making it ideal for applications such as OLED displays. Both parts use a unique control technique that delivers both high efficiency and low output ripple over a wide load current range. 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 company claims that the combination of the LT3495/-1’s 2 x 3mm DFN package and tiny, low cost ceramic capacitors and inductors provides 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%. The device’s low 60µA of quiescent current (<1µA in shutdown) maximizes battery run time, while integrated Schottky diodes and output disconnect circuitry minimizes 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, the LT3495B and LT3495B-1, which offer slightly higher light load efficiency.
The LT3495EDDB, LT3495EDDB-1, LT3495BEDDB and LT3495BEDDB-1 are all available from stock in a 10-lead 2 x 3mm DFN package. Pricing starts at $1.75 each for 1,000-piece quantities.
