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LT1175CS8 Datasheet(PDF) 1 Page - Linear Technology |
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LT1175CS8 Datasheet(HTML) 1 Page - Linear Technology |
1 / 18 page LT1175 1175fe Typical applicaTion FeaTures DescripTion 500mA Negative Low Dropout Micropower Regulator The LT®1175 is a negative micropower low dropout regulator. It features 45µA quiescent current, dropping to 10µA in shutdown. A new reference amplifier topology gives precision DC characteristics along with the ability to maintain good loop stability with an extremely wide range of output capacitors. Very low dropout voltage and high efficiency are obtained with a unique power transistor anti-saturation design. Adjustable and fixed 5V versions are available. Several new features make the LT1175 very user-friendly. The SHDN pin can interface directly to either positive or negative logic levels. Current limit is user-selectable at 200mA, 400mA, 600mA and 800mA. The output can be forced to reverse voltage without damage or latchup. Un- likesomeearlierdesigns,theincreaseinquiescentcurrent during a dropout condition is actively limited. The LT1175 has complete blowout protection with current limiting, power limiting and thermal shutdown. Special attention was given to the problem of high temperature operation with micropower operating currents, preventing output voltage rise under no-load conditions. The LT1175 is available in 8-pin PDIP and SO packages, 3-lead SOT- 223 as well as 5-pin surface mount DD and through-hole TO-220 packages. The 8-pin SO package is specially constructed for low thermal resistance. Typical LT1175 Connection applicaTions n Operating Current: 45µA n Adjustable Current Limit n Low Voltage Linear Dropout Characteristics n Stable with Wide Range of Output Capacitors n Shutdown Current: 10µA n Positive or Negative Shutdown Logic n Fixed 5V and Adjustable Versions n Tolerates Reverse Output Voltage n Available in 8-pin PDIP and SO Packages, 3-lead SOT-223, 5-Pin Surface Mount DD and Through-Hole TO-220 Packages n Analog Systems n Modems n Instrumentation n A/D and D/A Converters n Interface Drivers n Battery-Powered Systems L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Minimum Input-to-Output Voltage CIN* *CIN IS NEEDED ONLY IF REGULATOR IS MORE THAN 6" FROM INPUT SUPPLY CAPACITOR. SEE APPLICATIONS INFORMATION SECTION FOR DETAILS COUT ≥ 0.1µF –5V UP TO 500mA –VIN SHDN GND LT1175-5 SENSE OUTPUT 1175 TA01 ILIM4 ILIM2 VIN + + OUTPUT CURRENT (A) 0 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.5 1175 TA02 0.1 0.3 0.6 0.7 TJ = 25°C ILIM2, ILIM4 TIED TO VIN |
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