LT1118 - Low IQ, Low Dropout, 800mA, Source and Sink Regulators Adjustable and Fixed 2.5V, 2.85V, 5V Output
Features
- Regulates While Sourcing or Sinking Current
- Provides Termination for up to 27 SCSI Lines
- 600µA Quiescent Current
- Ultra-Low Power Shutdown Mode
- Current Limit and Thermal Shutdown Protection
- Stable for Any CLOAD >/= 0.22µF
- Fast Settling Time
- 1V Dropout Voltage
Typical Application
Description
The LT1118 family of low dropout regulators has the unique capability of maintaining output regulation while sourcing or sinking load current. The 2.85V output voltage regulator is ideal for use as a Boulay termination of up to 27 SCSI data lines. The regulator maintains regulation while both sourcing and sinking current, enabling the use of active negation drivers for improved noise immunity on the data lines. Regulation of output voltage is maintained for TERMPWR voltages as low as 4.0V. When unloaded, quiescent supply current is a low 600µA, allowing continuous connection to the TERMPWR lines. An ultralow power shutdown mode is also available on the SO-8 version. In Shutdown the output is high impedance and supply current drops to less than 10µA.
Current limits in both sourcing and sinking modes, plus on-chip thermal shutdown make the circuit tolerant of output fault conditions.
The LT1118 is available in 3-lead SOT-223 and 8-lead SO packages.
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 |
|---|---|---|---|---|---|
| LT1118CS8-2.5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8-2.5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8-2.85#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8-2.85#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8-5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8-5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1118CST-2.5#PBF | SOT-223 | ST | C | 05-08-1630 | Yes |
| LT1118CST-2.5#TRPBF | SOT-223 | ST | C | 05-08-1630 | Yes |
| LT1118CST-2.85#PBF | SOT-223 | ST | C | 05-08-1630 | Yes |
| LT1118CST-2.85#TRPBF | SOT-223 | ST | C | 05-08-1630 | Yes |
| LT1118CST-5#PBF | SOT-223 | ST | C | 05-08-1630 | Yes |
| LT1118CST-5#TRPBF | SOT-223 | ST | C | 05-08-1630 | 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
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1118CS8-2.5#PBF | SO-8 | C | $3.45 | $2.75 | Yes | |
| LT1118CS8-2.5#TRPBF | SO-8 | C | $2.81 | Yes | ||
| LT1118CS8-2.85#PBF | SO-8 | C | $3.20 | $2.55 | Yes | |
| LT1118CS8-2.85#TRPBF | SO-8 | C | $2.61 | Yes | ||
| LT1118CS8-5#PBF | SO-8 | C | $3.45 | $2.75 | Yes | |
| LT1118CS8-5#TRPBF | SO-8 | C | $2.81 | Yes | ||
| LT1118CS8#PBF | SO-8 | C | $3.45 | $2.75 | Yes | |
| LT1118CS8#TRPBF | SO-8 | C | $2.81 | Yes | ||
| LT1118CST-2.5#PBF | SOT-223 | C | $3.15 | $2.50 | Yes | |
| LT1118CST-2.5#TRPBF | SOT-223 | C | $2.56 | Yes | ||
| LT1118CST-2.85#PBF | SOT-223 | C | $2.90 | $2.35 | Yes | |
| LT1118CST-2.85#TRPBF | SOT-223 | C | $2.41 | Yes | ||
| LT1118CST-5#PBF | SOT-223 | C | $3.15 | $2.50 | Yes | |
| LT1118CST-5#TRPBF | SOT-223 | C | $2.56 | Yes | ||
| Buy Now • Request Samples | ||||||
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
Applications
- Active Negation SCSI Terminations
- Computers
- Disk Drives
- CD-ROM
- Supply Splitter
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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
Models for the following parts are available in LTspice:
LT1118
LT1118-2.5
LT1118-2.85
LT1118-5
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.
