MicroPower, Low Noise Boost Converters with Output Disconnect in 2mm x 3mm DFN Package

Linear Technology announces 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 2mm x 3mm DFN-10 package. 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. 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 ideal 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.

The LT3495’s NPN switch achieves a VCESAT of only 250mV at 500mA and offers efficiencies as high as 85%. The device’s low 60uA of quiescent current (<1uA 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 in a 10-lead 2mm x 3mm DFN package.

Summary of Features:

•Low Quiescent Current
•60uA in Active Mode
•0.1uA 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 × 2mm DFN Package

For further information please contact your local Sasco Holz Branch Office.