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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.

  Micropower Low Noise Boost Converters with Output Disconnect

Summary of Features: LT3495/-1/B/B-1
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


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