LTC3129-1 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3μA Quiescent Current
Features
- Regulates VOUT Above, Below or Equal to VIN
- Wide VIN Range: 2.42V to 15V, 1.92V to 15V After Start-Up (Bootstrapped)
- Fixed Output Voltage with Eight User-Selectable Settings from 2.5V to 15V
- 200mA Output Current in Buck Mode
- Single Inductor
- 1.3μA Quiescent Current
- Programmable Maximum Power Point Control
- 1.2MHz Ultralow Noise PWM
- Current Mode Control
- Pin Selectable Burst Mode® Operation
- Up to 95% Efficiency
- Accurate RUN Pin Threshold
- Power Good Indicator
- 10nA Shutdown Current
- Thermally Enhanced 3mm × 3mm QFN and 16-Lead MSOP Packages
AEC-Q100 data available for specific packages
Typical Application
Description
The LTC®3129-1 is a high efficiency, 200mA buck-boost DC/DC converter with a wide VIN and VOUT range. It includes an accurate RUN pin threshold to allow predictable regulator turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels.
The LTC3129-1 employs an ultralow noise, 1.2MHz PWM switching architecture that minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Built-in loop compensation and soft-start simplify the design. For high efficiency operation at light loads, automatic Burst Mode operation can be selected, reducing the quiescent current to just 1.3μA. To further reduce part count and improve light load efficiency, the LTC3129-1 includes an internal voltage divider to provide eight selectable fixed output voltages.
Additional features include a power good output, less than 10nA of shutdown current and thermal shutdown.
The LTC3129-1 is available in thermally enhanced 3mm × 3mm QFN and 16-lead MSOP packages. For an adjustable output voltage, see the functionally equivalent LTC3129.
| Output Voltage | |
| LTC3129 | Adjustable 1.4V to 15.75V via resistor divider |
| LTC3129-1 | 8 pin programmable output voltages from 2.5V to 15V |
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 |
|---|---|---|---|---|---|
| LTC3129EMSE-1#PBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LTC3129EMSE-1#TRPBF | MS-16E | MSE | E | 05-08-1667 | Yes |
| LTC3129EUD-1#PBF | 3x3 QFN-16 | UD | E | 05-08-1700 | Yes |
| LTC3129EUD-1#TRPBF | 3x3 QFN-16 | UD | E | 05-08-1700 | Yes |
| LTC3129IMSE-1#TRPBF | MS-16E | MSE | I | 05-08-1667 | Yes |
| LTC3129IUD-1#PBF | 3x3 QFN-16 | UD | I | 05-08-1700 | Yes |
| LTC3129IUD-1#TRPBF | 3x3 QFN-16 | UD | I | 05-08-1700 | 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 | |
|---|---|---|---|---|---|---|
| LTC3129EMSE-1#PBF | MS-16E | E | $4.22 | $2.95 | Yes | |
| LTC3129EMSE-1#TRPBF | MS-16E | E | $3.01 | Yes | ||
| LTC3129EUD-1#PBF | 3x3 QFN-16 | E | $4.22 | $2.95 | Yes | |
| LTC3129EUD-1#TRPBF | 3x3 QFN-16 | E | $3.01 | Yes | ||
| LTC3129IMSE-1#TRPBF | MS-16E | I | $3.31 | Yes | ||
| LTC3129IUD-1#PBF | 3x3 QFN-16 | I | $4.64 | $3.25 | Yes | |
| LTC3129IUD-1#TRPBF | 3x3 QFN-16 | I | $3.31 | 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 |
|---|---|---|---|
| DC1923A | LTC3129-1 Demo Board | 2.42V to 15V Input, 5V out at 200mA | $125.00 | |
| Buy Now | |||
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 | |
|---|---|---|---|---|---|---|
| LTC3129IUD-1#PBF | 3x3 QFN-16 | I | $4.64 | $3.25 | Yes | |
| LTC3129IUD-1#TRPBF | 3x3 QFN-16 | I | $3.31 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Industrial Wireless Sensor Nodes
- Post-Regulator for Harvested Energy
- Solar Panel Post-Regulator/Charger
- Intrinsically Safe Power Supplies
- Wireless Microphones
- Avionics-Grade Wireless Headsets
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Design Tools
LTspice
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LTC3129
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.
