MicroPower, low noise boost converters with output disconnect in 2mm x 3mm DFN package

Content Dam Leds En Ugc 2009 03 Micropower Low Noise Boost Converters With Output Disconnect In 2mm X 3mm Dfn Package Leftcolumn Article Thumbnailimage File
18253 0 thumb Date Announced: 20 Mar 2009

Linear Technology has 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 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 from stock in a 10-lead 2mm x 3mm DFN package. Pricing starts at $1.75 each for 1,000-piece quantities.

Summary of Features of the 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

Contact
UK, Ireland, South Africa and Israel: Alastair Boyd, Linear Technology (UK) Limited Tel: +44 (0)1628 477066 E-mail: aboyd@linear.com North America and General Information: Doug Dickinson, Linear Technology Corporation Tel: (408) 432 1900 ext. 2233 E-mail: ddickinson@linear.com

E-mail:uksales@linear.com

Web Site:www.linear.com

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