LT1175 - 500mA Negative Low Dropout …

1 LT117511175ff TYPICAL APPLICATION FEATURES DESCRIPTION500mA NegativeLow Dropout MicropowerRegulatorThe LT 1175 is a Negative micropower low Dropout regulator. It features 45 A quiescent current, dropping to 10 A in shutdown. A new reference amplifi er 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 effi ciency are obtained with a unique power transistor anti-saturation design.

2 Adjustable and fi xed 5V versions are 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-like some earlier designs, the increase in quiescent current during a Dropout condition is actively 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.

3 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 APPLICATIONSn Operating Current: 45 An Adjustable Current Limitn Low Voltage Linear Dropout Characteristicsn Stable with Wide Range of Output Capacitorsn Shutdown Current: 10 An Positive or Negative Shutdown Logicn Fixed 5V and Adjustable Versionsn Tolerates Reverse Output Voltagen Available in 8-pin PDIP and SO Packages, 3-lead SOT-223, 5-Pin Surface Mount DD and Through-Hole TO-220 Packagesn Analog Systemsn Modemsn Instrumentationn A/D and D/A Convertersn Interface Driversn Battery-Powered SystemsL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation.

4 All other trademarks are the property of their respective Input-to-Output VoltageCIN**CINIS NEEDED ONLY IF REGULATOR IS MORE THAN 6" FROM INPUT SUPPLY CAPACITOR. SEE APPLICATIONS INFORMATION SECTION FOR DETAILSCOUT F 5 VUP TO 500mA VINSHDNGNDLT1175-5 SENSEOUTPUT1175 TA01 ILIM4 ILIM2 VIN++OUTPUT CURRENT (A)0 INPUT-TO-OUTPUT VOLTAGE (V) = 25 CILIM2, ILIM4 TIED TO VINLT117521175ff ABSOLUTE MAXIMUM RATINGSI nput Voltage (Transient 1 sec, Note 12) ..25 VInput Voltage (Continuous) ..20 VInput-to-Output Differential Voltage (Note 13).

5 20V5V SENSE Pin (with Respect to GND Pin) .. 2V, 10 VADJ SENSE Pin(with Respect to OUTPUT Pin) ..20V, SENSE Pin(with Respect to OUTPUT Pin) ..20V, 7V PIN CONFIGURATIONO utput Reverse Voltage ..2 VSHDN Pin to GND Pin Voltage (Note 3) .. , 20 VSHDN Pin to VIN Pin Voltage ..30V, 5 VOperating Junction Temperature Range (Note 2)LT1175C .. 0 C to 125 CLT1175I .. 40 C to 125 CLT1175MP .. 55 C to 125 CStorage Temperature Range .. 65 C to 150 CLead Temperature (Soldering, 10 sec).. 300 C12348765 TOP VIEWVINILIM2 OUTPUTSENSEVINILIM4 SHDNGNDN8 PACKAGE8-LEAD PDIP JA = 80 C/W TO 120 C/W DEPENDING ON PC BOARD LAYOUTSHDNGNDVINSENSEOUTPUTQ PACKAGE5-LEAD PLASTIC DD-PAKFRONT VIEWTABISVIN54321 JA = 27 C/W TO 60 C/W DEPENDING ON PC MOUNTING.

6 SEE DATA SHEET FOR DETAILS321 FRONT VIEWTAB ISVINGNDVINOUTPUTST PACKAGE3-LEAD PLASTIC SOT-223 JA = 50 C/W WITH BACKPLANE AND 10cm2 TOPSIDE LAND SOLDERED TO TAB12348765 TOP VIEWS8 PACKAGE8-LEAD PLASTIC SOVINILIM2 OUTPUTSENSEVINILIM4 SHDNGND JA = 60 C/W TO 100 C/W DEPENDING ON PC BOARD LAYOUTPINS 1, 8 ARE INTERNALLY CONNECTED TO DIE ATTACH PADDLE FOR HEAT SINKING. ELECTRICAL CONTACT CAN BE MADE TO EITHER PIN. FOR BEST THERMAL RESISTANCE, PINS 1, 8 SHOULD BE CONNECTED TO AN EXPANDED LAND THAT IS OVER AN INTERNAL OR BACKSIDE APPLICATIONS INFORMATIONT PACKAGE5-LEAD PLASTIC TO-220 FRONT VIEW54321 SHDN GNDVIN SENSEOUTPUTTAB ISVIN JA = 50 C/W, JC = 5 C/W(Note 1)

7 LT117531175ff ORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT1175CN8#PBFLT1175CN8#TRPBFLT1175C N88-Lead Plastic Dip0 C to 125 CLT1175CN8-5#PBFLT1175CN8-5#TRPBFLT1175C N8-58-Lead Plastic Dip0 C to 125 CLT1175CS8#PBFLT1175CS8#TRPBF11758-Lead Plastic SO0 C to 125 CLT1175CS8-5#PBFLT1175CS8-5#TRPBF117558- Lead Plastic SO0 C to 125 CLT1175 CST-5#PBFLT1175 CST-5#TRPBF117553-Lead Plastic SOT-2230 C to 125 CLT1175CQ#PBFLT1175CQ#TRPBFLT1175CQ5-Lea d Plastic DD-Pak0 C to 125 CLT1175CQ-5#PBFLT1175CQ-5#TRPBFLT1175CQ- 55-Lead Plastic DD-Pak0 C to 125 CLT1175CT#PBFLT1175CT#TRPBFLT1175CT5-Lea d Plastic TO-2200 C to 125 CLT1175CT-5#PBFLT1175CT-5#TRPBFLT1175CT- 55-Lead Plastic TO-2200 C to 125 CLT1175IN8#PBFLT1175IN8#TRPBFLT1175IN88- Lead Plastic Dip 40 C to 125 CLT1175IN8-5#PBFLT1175IN8-5#TRPBFLT1175I N8-58-Lead Plastic Dip 40 C to 125 CLT1175IS8#PBFLT1175IS8#TRPBF1175I8-Lead Plastic SO 40 C to 125 CLT1175IS8-5#PBFLT1175IS8-5#TRPBF1175I58 -Lead Plastic SO 40 C to 125 CLT1175 IST-5#PBFLT1175

8 IST-5#TRPBF1175I53-Lead Plastic SOT-223 40 C to 125 CLT1175IQ#PBFLT1175IQ#TRPBFLT1175IQ5-Lea d Plastic DD-Pak 40 C to 125 CLT1175IQ-5#PBFLT1175IQ-5#TRPBFLT1175IQ- 55-Lead Plastic DD-Pak 40 C to 125 CLT1175IT#PBFLT1175IT#TRPBFLT1175IT5-Lea d Plastic TO-220 40 C to 125 CLT1175IT-5#PBFLT1175IT-5#TRPBFLT1175IT- 55-Lead Plastic TO-220 40 C to 125 CLT1175 MPS8#PBFLT1175 MPS8#TRPBF1175MP8-Lead Plastic SO 55 C to 125 CLT1175 MPS8-5#PBFLT1175 MPS8-5#TRPBF175MP58-Lead Plastic SO 55 C to 125 CLT1175 MPQ#PBFLT1175 MPQ#TRPBFLT1175 MPQ5-Lead Plastic DD-Pak 55 C to 125 CLT1175 MPQ-5#PBFLT1175 MPQ-5#TRPBFLT1175 MPQ-55-Lead Plastic DD-Pak 55 C to 125 CLEAD BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT1175CN8LT1175CN8#TRLT1175CN88-Lea d Plastic Dip0 C to 125 CLT1175CN8-5LT1175CN8-5#TRLT1175CN8-58-L ead Plastic Dip0 C to 125 CLT1175CS8LT1175CS8#TR11758-Lead Plastic SO0 C to 125 CLT1175CS8-5LT1175CS8-5#TR117558-Lead Plastic SO0 C to 125 CLT1175 CST-5LT1175 CST-5#TR117553-Lead Plastic SOT-2230 C to 125 CLT1175 CQLT1175CQ#TRLT1175CQ5-Lead

9 Plastic DD-Pak0 C to 125 CLT1175CQ-5LT1175CQ-5#TRLT1175CQ-55-Lead Plastic DD-Pak0 C to 125 CLT1175 CTLT1175CT#TRLT1175CT5-Lead Plastic TO-2200 C to 125 CLT1175CT-5LT1175CT-5#TRLT1175CT-55-Lead Plastic TO-2200 C to 125 CLT1175IN8LT1175IN8#TRLT1175IN88-Lead Plastic Dip 40 C to 125 CLT1175IN8-5LT1175IN8-5#TRLT1175IN8-58-L ead Plastic Dip 40 C to 125 CLT1175IS8LT1175IS8#TR1175I8-Lead Plastic SO 40 C to 125 CLT1175IS8-5LT1175IS8-5#TR1175I58-Lead Plastic SO 40 C to 125 CLT1175 IST-5LT1175 IST-5#TR1175I53-Lead Plastic SOT-223 40 C to 125 CLT1175 IQLT1175IQ#TRLT1175IQ5-Lead Plastic DD-Pak 40 C to 125 CLT1175IQ-5LT1175IQ-5#TRLT1175IQ-55-Lead Plastic DD-Pak 40 C to 125 CLT117541175ff ORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELT1175 ITLT1175IT#TRLT1175IT5-Lead Plastic TO-220 40 C to 125 CLT1175IT-5LT1175IT-5#TRLT1175IT-55-Lead Plastic TO-220 40 C to 125 CLT1175 MPS8LT1175 MPS8#TR1175MP8-Lead Plastic SO 55 C to 125 CLT1175 MPS8-5LT1175 MPS8-5#TR175MP58-Lead Plastic SO 55 C to 125 CLT1175 MPQLT1175

10 MPQ#TRLT1175 MPQ5-Lead Plastic DD-Pak 55 C to 125 CLT1175 MPQ-5LT1175 MPQ-5#TRLT1175 MPQ-55-Lead Plastic DD-Pak 55 C to 125 CConsult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS The l denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T