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
AEC-Q100 data available for specific packages
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 |
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
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 Now • Request Samples | ||||||
Applications
- Analog Systems
- Modems
- Instrumentation
- A/D and D/A Converters
- Interface Drivers
- Battery-Powered Systems
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Design Tools
LTspice
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Models for the following parts are available in LTspice:
LT1175
LT1175-5
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
