LT1175 - 500mA Negative Low Dropout Micropower Regulator

Features

  • Operating Current: 45μA
  • Adjustable Current Limit
  • Low Voltage Linear Dropout Characteristics
  • Stable with Wide Range of Output Capacitors
  • Shutdown Current: 10μA
  • Positive or Negative Shutdown Logic
  • Fixed 5V and Adjustable Versions
  • Tolerates Reverse Output Voltage
  • Available in 8-pin PDIP and SO Packages, 3-lead SOT-223, 5-Pin Surface Mount DD and Through-Hole TO-220 Packages
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LT1175 Typical Application
LT1175 Typical Application

Description

The LT1175 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. Unlike some earlier designs, the increase in quiescent current 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.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT1175CN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LT1175CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1175CQ-5#PBF DDPAK-5 Q C 05-08-1461 Yes
LT1175CQ-5#TRPBF DDPAK-5 Q C 05-08-1461 Yes
LT1175CQ#PBF DDPAK-5 Q C 05-08-1461 Yes
LT1175CQ#TRPBF DDPAK-5 Q C 05-08-1461 Yes
LT1175CS8-5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1175CS8-5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1175CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1175CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1175CST-5#PBF SOT-223 ST C 05-08-1630 Yes
LT1175CST-5#TRPBF SOT-223 ST C 05-08-1630 Yes
LT1175CT-5#06PBF TO-220 T C 05-08-1421 (Flow 06) Yes
LT1175CT-5#PBF TO-220 T C 05-08-1421 (Standard) Yes
LT1175CT#06PBF TO-220 T C 05-08-1421 (Flow 06) Yes
LT1175CT#PBF TO-220 T C 05-08-1421 (Standard) Yes
LT1175IN8-5#PBF N-8 N I 05-08-1510 (N8) Yes
LT1175IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LT1175IQ-5#PBF DDPAK-5 Q I 05-08-1461 Yes
LT1175IQ-5#TRPBF DDPAK-5 Q I 05-08-1461 Yes
LT1175IQ#PBF DDPAK-5 Q I 05-08-1461 Yes
LT1175IQ#TRPBF DDPAK-5 Q I 05-08-1461 Yes
LT1175IS8-5#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1175IS8-5#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1175IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1175IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1175IST-5#PBF SOT-223 ST I 05-08-1630 Yes
LT1175IST-5#TRPBF SOT-223 ST I 05-08-1630 Yes
LT1175IT-5#PBF TO-220 T I 05-08-1421 (Standard) Yes
LT1175IT#PBF TO-220 T I 05-08-1421 (Standard) Yes
LT1175MPQ-5 DDPAK-5 Q MP 05-08-1461 No
LT1175MPQ-5#PBF DDPAK-5 Q MP 05-08-1461 Yes
LT1175MPQ-5#TRPBF DDPAK-5 Q MP 05-08-1461 Yes
LT1175MPQ#PBF DDPAK-5 Q MP 05-08-1461 Yes
LT1175MPQ#TRPBF DDPAK-5 Q MP 05-08-1461 Yes
LT1175MPS8-5 SO-8 S8 MP 05-08-1610 (S8) No
LT1175MPS8-5#PBF SO-8 S8 MP 05-08-1610 (S8) Yes
LT1175MPS8-5#TRPBF SO-8 S8 MP 05-08-1610 (S8) Yes
LT1175MPS8#PBF SO-8 S8 MP 05-08-1610 (S8) Yes
LT1175MPS8#TRPBF SO-8 S8 MP 05-08-1610 (S8) Yes


LT1175 Package Drawing
LT1175 Package Drawing
LT1175 Package Drawing
LT1175 Package Drawing
LT1175 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1175CN8-5#PBF N-8 C $3.10 $2.50 Yes
LT1175CN8#PBF N-8 C $3.10 $2.50 Yes
LT1175CQ-5#PBF DDPAK-5 C $3.90 $3.20 Yes
LT1175CQ-5#TRPBF DDPAK-5 C $3.32 Yes
LT1175CQ#PBF DDPAK-5 C $3.90 $3.20 Yes
LT1175CQ#TRPBF DDPAK-5 C $3.32 Yes
LT1175CS8-5#PBF SO-8 C $3.60 $2.90 Yes
LT1175CS8-5#TRPBF SO-8 C $2.96 Yes
LT1175CS8#PBF SO-8 C $3.60 $2.90 Yes
LT1175CS8#TRPBF SO-8 C $2.96 Yes
LT1175CST-5#PBF SOT-223 C $3.25 $2.60 Yes
LT1175CST-5#TRPBF SOT-223 C $2.66 Yes
LT1175CT-5#06PBF TO-220 C $3.75 $3.05 Yes
LT1175CT-5#PBF TO-220 C $3.75 $3.05 Yes
LT1175CT#06PBF TO-220 C $3.75 $3.05 Yes
LT1175CT#PBF TO-220 C $3.75 $3.05 Yes
LT1175IN8-5#PBF N-8 I $4.00 $3.25 Yes
LT1175IN8#PBF N-8 I $4.00 $3.25 Yes
LT1175IQ-5#PBF DDPAK-5 I $5.00 $4.10 Yes
LT1175IQ-5#TRPBF DDPAK-5 I $4.22 Yes
LT1175IQ#PBF DDPAK-5 I $5.00 $4.10 Yes
LT1175IQ#TRPBF DDPAK-5 I $4.22 Yes
LT1175IS8-5#PBF SO-8 I $4.65 $3.80 Yes
LT1175IS8-5#TRPBF SO-8 I $3.86 Yes
LT1175IS8#PBF SO-8 I $4.65 $3.80 Yes
LT1175IS8#TRPBF SO-8 I $3.86 Yes
LT1175IST-5#PBF SOT-223 I $3.60 $2.85 Yes
LT1175IST-5#TRPBF SOT-223 I $2.91 Yes
LT1175IT-5#PBF TO-220 I $4.80 $3.95 Yes
LT1175IT#PBF TO-220 I $4.85 $3.95 Yes
LT1175MPQ-5 DDPAK-5 MP $13.71 $9.60 No
LT1175MPQ-5#PBF DDPAK-5 MP $13.71 $9.60 Yes
LT1175MPQ-5#TRPBF DDPAK-5 MP $9.66 Yes
LT1175MPQ#PBF DDPAK-5 MP $13.71 $9.60 Yes
LT1175MPQ#TRPBF DDPAK-5 MP $9.66 Yes
LT1175MPS8-5 SO-8 MP $12.43 $8.70 No
LT1175MPS8-5#PBF SO-8 MP $12.43 $8.70 Yes
LT1175MPS8-5#TRPBF SO-8 MP $8.76 Yes
LT1175MPS8#PBF SO-8 MP $12.43 $8.70 Yes
LT1175MPS8#TRPBF SO-8 MP $8.76 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1175IST-5#PBF SOT-223 I $3.60 $2.85 Yes
LT1175IST-5#TRPBF SOT-223 I $2.91 Yes
Buy NowRequest Samples
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

  • Analog Systems
  • Modems
  • Instrumentation
  • A/D and D/A Converters
  • Interface Drivers
  • Battery-Powered Systems

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT1175
LT1175-5

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