Features

• 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

Typical Application

Description

The LTC®3129 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.