Buck-boost & inverting controllers (external switch)

A broad and industry-leading portfolio of wide input voltage and high-power buck-boost and SEPIC controllers

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Our portfolio of buck-boost and SEPIC controllers is designed to reduce the need for protection components through wide voltage input ranges, minimize battery draw with low quiescent current and high light-load efficiency, and mitigate noise and EMI in rugged environments, such as automotive and industrial systems.

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Four-switch buck-boost controller

Four switches for maximum efficiency under all load conditions and medium-to-high power requirements.

Two-switch buck-boost controller

Two switches and two rectifier diodes for simplicity and low-to-medium power requirements.

SEPIC controller

One switch plus rectifier diode and two inductors for cost effectiveness and low-power requirements.

Buck-boost controller

Bidirectional controller to boost in one and buck in the other direction

LM5177 NEW

78-V wide VIN synchronous 4-switch buck-boost controller with bidirectional operation

Approx. price (USD) 1ku | 3.49

Technical resources

Technical article
Technical article
Adjusting VOUT in USB Type-C™ and wireless charging applications, part 1
Learn how to use switched resistors in your four-switch buck-boost controller design to implement dynamic output voltage adjustment. 
Application note
Application note
LM5176 Power Sharing Between Two Parallel, Four-Switch Buck-Boost Converters
Learn how to support several  hundreds of watts of output power by placing two four-switch buck-boost controllers in parallel.
document-pdfAcrobat PDF
White paper
White paper
Bridging 12 V and 48 V in dual-battery automotive systems
A discussion around the requirements of a 12-V and 48-V system, as well as introduction to an innovative average current-mode control scheme, featuring the LM5170-Q1 bidirectional buck-boost controller.
document-pdfAcrobat PDF

Design & development resources

Design tool
WEBENCH® Power Designer
WEBENCH® Power Designer creates customized power-supply circuits based on your requirements. The environment gives you end-to-end power-supply design capabilities that save you time during all phases of the design process.
Simulation tool
PSpice® for TI design and simulation tool
PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Design tool
Power Stage Designer™ Tool of Most Commonly Used Switch-mode Power Supplies
Power Stage DesignerTM is a JAVA-based tool (requires JAVA 8 or OpenJDK 8) that helps engineers accelerate their power-supply designs by calculating voltages and currents of 20 topologies according to the user’s inputs. Additionally, Power Stage Designer contains a Bode plotting tool and a (...)

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