LTC3129

RECOMMENDED FOR NEW DESIGNS

15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3μA Quiescent Current

Part Models: 9
1ku List Price: Starting From $3.54

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Part Details

Regulates V_OUT Above, Below or Equal to V_IN
Wide V_IN Range: 2.42V to 15V, 1.92V to 15V After Start-Up (Bootstrapped)
Wide V_OUT Range: 1.4V to 15.75V
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

The LTC3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide V_IN and V_OUT 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 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.

Additional features include a power good output, less than 10nA of shutdown current and thermal shutdown.

The LTC3129 is available in thermally enhanced 3mm × 3mm QFN and 16-lead MSOP packages. For fixed output voltage options, see the functionally equivalent LTC3129-1, which eliminates the need for an external feedback divider.


	Output Voltage
LTC3129	Adjustable 1.4V to 15.75V via resistor divider
LTC3129-1	8 pin programmable output voltages from 2.5V to 15V

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

Part Models: 9
1ku List Price: Starting From $3.54

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3129EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129EUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129IMSE-1#PBF	16-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129IUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3129IUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC3129EMSE#PBF	PRODUCTION
LTC3129EMSE#TRPBF	PRODUCTION
LTC3129IMSE#PBF	PRODUCTION
LTC3129IMSE#TRPBF	PRODUCTION
LTC3129IMSE-1#PBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC3129EMSE#PBF	PRODUCTION
LTC3129EMSE#TRPBF	PRODUCTION
LTC3129IMSE#PBF	PRODUCTION
LTC3129IMSE#TRPBF	PRODUCTION
LTC3129IMSE-1#PBF	PRODUCTION
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report
LTC3129EMSE#PBF	PRODUCTION
LTC3129EMSE#TRPBF	PRODUCTION
LTC3129IMSE#PBF	PRODUCTION
LTC3129IMSE#TRPBF	PRODUCTION
LTC3129IMSE-1#PBF	PRODUCTION
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC3129IMSE-1#PBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

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LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3129
LTC3129-1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC3129 Demo Board | Micropower, Sync Buck-Boost, 2.42V ≤ VIN ≤ 15V, VOUT = 5V @ 200mA

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Product Details

Demonstration Circuit 1922A features the LTC3129, a high efficiency 200mA buck-boost DC/DC converter with a wide V_IN and V_OUT range. The DC1922A demo board has two user selectable operating modes: Burst Mode^® Operation and Fixed Frequency PWM (JP3). There is also an accurate programmable RUN pin which is used to ENABLE the converter (JP1). The LTC3129 also incorporates a maximum power point control function which can be enabled (JP2) for applications where the input source is a solar cell or is high impedance, such as intrinsically safe applications or high Z_OUT thermal electric generators (TEGs).

The DC1922A operates with a 2.42V to 15V input voltage range, and has been designed with the output voltage set to 5.0V. Once the converter is started the LTC3129 can operate with V_IN as low as 1.92V provided V_CC is backfed. The demo board has optional provisions to backfeed V_CC (D1) in order to increase efficiency in some 5V output applications, or to allow operation with V_IN down to 1.92V.

Resources

DC1922A - Design Files
687.00K

DC1922A - Demo Manual
436.00K

DC1922A - Schematic
72.00K

Latest Discussions

4 Years Ago

LTC3129

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

Video 1

Solutions Bulletin & Brochure 1