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Switching regulator boasts low quiescent current

Posted: 31 Aug 2010     Print Version  Bookmark and Share

Keywords:switching regulator  buck converter  step-down regulator 

Linear Technology debuts the LTC3388, a low quiescent current synchronous buck converter than can deliver up to 50mA of continuous output current from a 2.7V to 20V input supply. The LTC3388's no-load operating current of only 720nA makes it suitable for a wide range of battery-powered and low quiescent power applications including "keep-alive," energy harvesting and industrial control power.


The LTC3388 utilises hysteretic synchronous rectification to optimise efficiency over a wide range of load currents. It can offer over 90 per cent efficiency for loads ranging from 15µA to 50mA and only requires 720nA of no load quiescent current in regulation, thereby extending battery life.

The combination of a 3mm x 3mm DFN package (or MSOP-10) and only five external components offers a very simple and compact solution footprint for a wide array of low power applications.

The LTC3388 incorporates an accurate under-voltage lock-out feature to disable the converter when the input voltage drops below 2.3V, reducing quiescent current to only 400nA. Once in regulation (at no load), the LTC3388 enters a sleep mode to minimise quiescent current to only 720nA. The buck converter then turns on and off as needed to maintain output regulation.

An additional standby mode disables buck switching while the output is in regulation for short duration loads, such as wireless modems, which require low ripple. This high efficiency, low quiescent current design is suitable for applications such as remote monitors, which require long standby times accompanied by short burst loads for powering sensors and wireless transceivers.

The LTC3388 is offered in two different versions, each with different pin-selectable output voltages. The LTC3388-1 offers 1.2V, 1.5V, 1.8V or 2.5V outputs whereas the LTC3388-3 offers 2.8V, 3.0V, 3.3V or 5V outputs.

Pricing for the LTC3388EDD-1, LTC3388EDD-3, LTC3388EMSE-1 and the LTC3388EMSE-3 starts at Rs.138.56 ($2.95), each, for 1,000-piece quantities.

Industrial grade versions, namely the LTC3388IDD-1, LTC3388IDD-3, LTC3388IMSE-1 and LTC3388IMSE-3 operate from a -40°C to 125°C operating junction temperature. They are priced at Rs.159.22 ($3.39) each, respectively in 1,000-piece quantities.

All versions are available from stock.

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