LTC3129-1

RECOMMENDED FOR NEW DESIGNS

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

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Overview

  • 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

The LTC3129-1 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

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
LTC3129-1
15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3μA Quiescent Current
Efficiency and Power Loss vs Load Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Protection Switches & Controllers 2
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
LTC4365
RECOMMENDED FOR NEW DESIGNS Overvoltage, Undervoltage and Reverse Supply Protection Controller
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3129
  • LTC3129-1
LTspice

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

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schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1923A

LTC3129-1 Demo Board | 2.42V to 15V Input, 5VOUT at 200mA

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Product Details

Demonstration circuit 1923A features the LTC3129-1, a high efficiency 200mA output buck-boost DC/DC converter with a wide VIN and VOUT range. The DC1923A operates with a 2.42V to 15V input voltage range, and has been designed with the output voltage set to 5V. The demo board can be programmed to any of eight voltage settings (2.5V, 3.3V, 4.1V, 5V, 6.9V, 8.2V, 12V, 15V) by using jumpers.


 
DC1923A
LTC3129-1 Demo Board | 2.42V to 15V Input, 5VOUT at 200mA
DC1923A Demo Board DC1923A Demo Board DC1923A Demo Board DC1923A Demo Board DC1923A - Schematic

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