500-mA negative micropower LDO offers high reliability benefits
August 19, 2010 // Paul Buckley
Linear Technology Corporation has released 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 degrees C operating junction temperature range. With a wide input voltage range of -4.3 V to -20 V, the LT1175 features micropower operating currents of 45 µA quiescent and 10
µA in shutdown, preventing output voltage rise under no-load conditions. The device's reference amplifier topology ensures precision DC characteristics and the ability to maintain good loop stability with a wide range of output capacitors. The device's power transistor anti-saturation design enables very low dropout voltage of 500 mV (typical at full load). Fixed 5 V and adjustable (-3.8 V to -19.5 V) output voltage versions are available.
Several features make the LT1175 user-friendly. The SHDN pin can interface directly to either positive or negative logic levels. Unlike prior regulators, the increase in quiescent current during a dropout condition is actively limited. The LT1175 offers complete protection including user-selectable current limit at 200 mA, 400 mA, 600 mA and 800 mA, power limiting (current limit foldback), thermal shutdown and the ability to force the output to reverse voltage without damage or latchup.
In addition to the SOIC-8 and power DD-Pak packages, the LT1175 is available in a 3-lead SOT-223, a through-hole power TO-220 package and an 8-pin PDIP package. C-grade operating junction temperature is 0 to +125 degrees C, I grade is specified from -40 to +125 degrees C, and MP grade is -55 to +125 degrees C. 1k pricing for the MP grade in DD-Pak is 9.60 US Dollars and SOIC is 8.70 US Dollars, and devices are available in stock.
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