LTC3118 - 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath
Features
- Integrated High Efficiency Dual Input PowerPath™ Plus Buck-Boost DC/DC Converter
- Ideal Diode or Priority VIN Select Modes
- VIN1 and VIN2 Range: 2.2V to 18V
- VOUT Range: 2V to 18V
- Either VIN Can Be Above, Below or Equal to VOUT
- Generates 5V at 2A for VIN > 6V
- 1.2MHz Low Noise Fixed Frequency Operation
- Current Mode Control
- All Internal N-Channel MOSFETs
- Pin-Selectable PWM or Burst Mode® Operation
- Accurate, Independent RUN Pin Thresholds
- Up to 94% Efficiency
- VIN and VOUT Power Good Indicators
- IQ of 50μA in Sleep, 2μA in Shutdown
- 4mm × 5mm 24-Lead QFN or 28-Lead TSSOP Packages
Typical Application
Description
The LTC®3118 is a dual-input, wide voltage range synchronous buck-boost DC/DC converter with an intelligent, integrated, low loss PowerPath control. The unique power switch architecture provides efficient operation from either input source to a programmable output voltage above, below or equal to the input. Voltage capability of up to 18V provides flexibility and voltage margin for a wide variety of applications and power sources.
The LTC3118 uses a low noise, current mode architecture with a fixed 1.2MHz PWM mode frequency that minimizes the solution footprint. For high efficiency at light loads, automatic Burst Mode operation can be selected consuming only 50μA of quiescent current in sleep.
System level features include ideal diode or VIN priority modes, VIN and VOUT power good indicators, accurate RUN comparators to program independent UVLO thresholds, and output disconnect in shutdown. Other features include 2μA shutdown current, short-circuit protection, soft-start, current limit and thermal overload protection.
The LTC3118 is offered in thermally enhanced 24-lead 4mm × 5mm QFN and 28-lead TSSOP 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 |
|---|---|---|---|---|---|
| LTC3118EFE#PBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LTC3118EFE#TRPBF | TSSOP-28 | FE | E | 05-08-1663 (EB) | Yes |
| LTC3118EUFD#PBF | 4x5 QFN-24 | UFD | E | 05-08-1696 | Yes |
| LTC3118EUFD#TRPBF | 4x5 QFN-24 | UFD | E | 05-08-1696 | Yes |
| LTC3118HFE#PBF | TSSOP-28 | FE | H | 05-08-1663 (EB) | Yes |
| LTC3118HFE#TRPBF | TSSOP-28 | FE | H | 05-08-1663 (EB) | Yes |
| LTC3118HUFD#PBF | 4x5 QFN-24 | UFD | H | 05-08-1696 | Yes |
| LTC3118HUFD#TRPBF | 4x5 QFN-24 | UFD | H | 05-08-1696 | Yes |
| LTC3118IFE#PBF | TSSOP-28 | FE | I | 05-08-1663 (EB) | Yes |
| LTC3118IFE#TRPBF | TSSOP-28 | FE | I | 05-08-1663 (EB) | Yes |
| LTC3118IUFD#PBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
| LTC3118IUFD#TRPBF | 4x5 QFN-24 | UFD | I | 05-08-1696 | Yes |
| LTC3118MPFE#PBF | TSSOP-28 | FE | MP | 05-08-1663 (EB) | Yes |
| LTC3118MPFE#TRPBF | TSSOP-28 | FE | MP | 05-08-1663 (EB) | Yes |
| LTC3118MPUFD#PBF | 4x5 QFN-24 | UFD | MP | 05-08-1696 | Yes |
| LTC3118MPUFD#TRPBF | 4x5 QFN-24 | UFD | MP | 05-08-1696 | 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 | |
|---|---|---|---|---|---|---|
| LTC3118EFE#PBF | TSSOP-28 | E | $8.57 | $6.00 | Yes | |
| LTC3118EFE#TRPBF | TSSOP-28 | E | $6.06 | Yes | ||
| LTC3118EUFD#PBF | 4x5 QFN-24 | E | $8.22 | $5.75 | Yes | |
| LTC3118EUFD#TRPBF | 4x5 QFN-24 | E | $5.81 | Yes | ||
| LTC3118HFE#PBF | TSSOP-28 | H | $9.79 | $6.85 | Yes | |
| LTC3118HFE#TRPBF | TSSOP-28 | H | $6.91 | Yes | ||
| LTC3118HUFD#PBF | 4x5 QFN-24 | H | $9.40 | $6.58 | Yes | |
| LTC3118HUFD#TRPBF | 4x5 QFN-24 | H | $6.64 | Yes | ||
| LTC3118IFE#PBF | TSSOP-28 | I | $9.43 | $6.60 | Yes | |
| LTC3118IFE#TRPBF | TSSOP-28 | I | $6.66 | Yes | ||
| LTC3118IUFD#PBF | 4x5 QFN-24 | I | $9.04 | $6.33 | Yes | |
| LTC3118IUFD#TRPBF | 4x5 QFN-24 | I | $6.39 | Yes | ||
| LTC3118MPFE#PBF | TSSOP-28 | MP | $25.46 | $17.82 | Yes | |
| LTC3118MPFE#TRPBF | TSSOP-28 | MP | $17.88 | Yes | ||
| LTC3118MPUFD#PBF | 4x5 QFN-24 | MP | $24.40 | $17.08 | Yes | |
| LTC3118MPUFD#TRPBF | 4x5 QFN-24 | MP | $17.14 | 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2045A | LTC3118EUFD Demo Board | Dual Input Buck-Boost, 2.5V ≤ VIN ≤ 18V, Vout = 5V @ up to 2A | $175.00 | |
| Buy Now | |||
Applications
- Systems with Multiple Input Sources
- Back Up Power Systems
- Wall Adapter or Li-Ion(s) Input to 5VOUT
- Battery or Super Capacitor Input for Reserve Power
- Replace Diode-OR Designs with Higher Efficiency, Flexibility and Performance
People Who Viewed This Product Also Viewed
- LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter
- LT4320/LT4320-1 - Ideal Diode Bridge Controller
- LT8705 - 80V VIN and VOUT Synchronous 4-Switch Buck- Boost DC/DC Controller
- LTC3114-1 - 40V, 1A Synchronous Buck-Boost DC/DC Converter with Programmable Output Current
- LTC4364 - Surge Stopper with Ideal Diode
- LT8471 - Dual Multitopology DC/DC Converters with 2A Switches and Synchronization
- LTC4020 - 55V Buck-Boost Multi-Chemistry Battery Charger
- LT3652 - Power Tracking 2A Battery Charger for Solar Power
- LTC3112 - 15V, 2.5A Synchronous Buck-Boost DC/DC Converter
- LTC4412 - Low Loss PowerPath Controller in ThinSOT
Product Notifications
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.
Design Tools
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
To open the project file for this circuit:
- Step 1: If you have not installed LTpowerCAD on this computer, download and install LTpowerCAD
- Step 2: Once LTpowerCAD is installed, click on the link(s) below to open the project file
- Step 3: If LTpowerCAD does not automatically open after clicking the link above, you can open the project file by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTpowerCAD and open the project file by selecting 'Open Project' from the 'File' menu
Design tools for the following parts are available in LTpowerCAD:
LTC3118
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.
