19 August 2010
Low dropout regulator operates down to -55°C
Linear Technology has announced a new high reliability, military plastic MP-grade version of the LT1175, a 500mA negative micropower low dropout regulator. The MP-grade LT1175 is offered in SOIC-8 and DD-Pak packages with a -55 to 125°C operating junction temperature range.
According to Linear it has an input voltage range of -4.3 to -20V and features micropower operating currents of 45uA quiescent and 10uA in shutdown, preventing output voltage rise under no-load conditions.
The device's reference amplifier topology is designed to ensure precision dc characteristics and the ability to maintain loop stability with a range of output capacitors. Its power transistor anti-saturation design is said to enable low dropout voltage of 500mV (typical at full load). Fixed 5V and adjustable (-3.8 to -19.5V) output voltage versions are available.
The SHDN pin can interface directly to either positive or negative logic levels and the increase in quiescent current during a dropout condition is actively limited. It includes user-selectable current limit at 200, 400, 600 and 800mA, power limiting (current limit foldback), thermal shutdown and the ability to force the output to reverse voltage without damage or latchup.
Author
Chris Shaw
Supporting Information
Websites
http://www.linear.com/1175
Companies
Linear Technology (UK) Ltd
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