LTC3111 - 15V, 1.5A Synchronous Buck-Boost DC/DC Converter
Features
- Regulated Output with VIN Above, Below or Equal to VOUT
- 2.5V to 15V Input and Output Voltage Range
- 1.5A Continuous Output Current: VIN ≥ 5V, VOUT = 5V, PWM Mode
- Single Inductor
- Accurate RUN Threshold
- Up to 95% Efficiency
- 800kHz Switching Frequency, Synchronizable Between 600kHz and 1.5MHz
- 49μA No-Load Quiescent Current in Burst Mode® Operation
- Output Disconnect in Shutdown
- Shutdown Current < 1μA
- Internal Soft-Start
- Small, Thermally Enhanced 14-Lead (3mm × 4mm × 0.75mm) DFN and 16-Lead MSOP Packages
Typical Application
Description
The LTC®3111 is a fixed frequency, synchronous buckboost DC/DC converter with an extended input and output range. The unique 4-switch, single inductor architecture provides low noise and seamless operation from input voltages above, below or equal to the output voltage.
With an input and output range of 2.5V to 15V, the LTC3111 is well suited for a wide variety of single or multiple-cell batteries, back-up capacitor or wall adapter source applications. Low RDS(ON) internal N-channel MOSFET switches and selectable PWM or Burst Mode operation produce high efficiency over a wide range of operating conditions. An accurate RUN pin allows the user to program the turn-on threshold voltage of the converter. Other features include: short-circuit protection, internal soft-start and thermal shutdown.
The LTC3111 is offered in both thermally enhanced 14-lead (3mm × 4mm × 0.75mm) DFN and 16-lead MSOP 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 |
|---|---|---|---|---|---|
| LTC3111EDE#PBF | 4x3 DFN-14 | DE | E | 05-08-1708 | Yes |
| LTC3111EDE#TRPBF | 4x3 DFN-14 | DE | E | 05-08-1708 | Yes |
| LTC3111EMSE#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LTC3111EMSE#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LTC3111HDE#PBF | 4x3 DFN-14 | DE | H | 05-08-1708 | Yes |
| LTC3111HDE#TRPBF | 4x3 DFN-14 | DE | H | 05-08-1708 | Yes |
| LTC3111HMSE#PBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LTC3111HMSE#TRPBF | MS-16E | MSE | H | 05-08-1667 | Yes |
| LTC3111IDE#PBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LTC3111IDE#TRPBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LTC3111IMSE#PBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LTC3111IMSE#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LTC3111MPDE#PBF | 4x3 DFN-14 | DE | MP | 05-08-1708 | Yes |
| LTC3111MPDE#TRPBF | 4x3 DFN-14 | DE | MP | 05-08-1708 | Yes |
| LTC3111MPMSE#PBF | MS-16E | MSE | MP | 05-08-1667 | Yes |
| LTC3111MPMSE#TRPBF | MS-16E | MSE | MP | 05-08-1667 | 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 | |
|---|---|---|---|---|---|---|
| LTC3111EDE#PBF | 4x3 DFN-14 | E | $5.00 | $3.50 | Yes | |
| LTC3111EDE#TRPBF | 4x3 DFN-14 | E | $3.56 | Yes | ||
| LTC3111EMSE#PBF | MS-16E | E | $5.14 | $3.60 | Yes | |
| LTC3111EMSE#TRPBF | MS-16E | E | $3.66 | Yes | ||
| LTC3111HDE#PBF | 4x3 DFN-14 | H | $5.86 | $4.10 | Yes | |
| LTC3111HDE#TRPBF | 4x3 DFN-14 | H | $4.16 | Yes | ||
| LTC3111HMSE#PBF | MS-16E | H | $6.02 | $4.21 | Yes | |
| LTC3111HMSE#TRPBF | MS-16E | H | $4.27 | Yes | ||
| LTC3111IDE#PBF | 4x3 DFN-14 | I | $5.50 | $3.85 | Yes | |
| LTC3111IDE#TRPBF | 4x3 DFN-14 | I | $3.91 | Yes | ||
| LTC3111IMSE#PBF | MS-16E | I | $5.66 | $3.96 | Yes | |
| LTC3111IMSE#TRPBF | MS-16E | I | $4.02 | Yes | ||
| LTC3111MPDE#PBF | 4x3 DFN-14 | MP | $14.86 | $10.40 | Yes | |
| LTC3111MPDE#TRPBF | 4x3 DFN-14 | MP | $10.46 | Yes | ||
| LTC3111MPMSE#PBF | MS-16E | MP | $15.27 | $10.69 | Yes | |
| LTC3111MPMSE#TRPBF | MS-16E | MP | $10.75 | 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 |
|---|---|---|---|
| DC1999A | LTC3111 Demo Board | Buck-Boost Converter, 2.5V ≤ VIN ≤ 15V, Vout = 5V @ 1.5A | $150.00 | |
| Buy Now | |||
Applications
- 3.3V or 5V from 1, 2 or 3 Li-Ion, Multiple-Cell Alkaline/NiMH Batteries
- RF Transmitters
- Military, Industrial Power Systems
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Design Tools
LTspice
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LTC3111
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.
