Boost controllers (external switch)

A broad and industry-leading portfolio of wide-input voltage and high-power boost controllers to implement boost, flyback and SEPIC DC/DC regulators

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Our portfolio of synchronous and nonsynchronous boost controllers are 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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Synchronous

High-efficiency and high-output power levels

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Nonsynchronous

Only one FET plus one rectifier diode needed to implement boost, flyback or SEPIC DC/DC regulators

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Automotive grade

Automotive-qualified boost controllers

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Featured boost controllers

New products

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LM51231-Q1 NEW
LM51231-Q1 ACTIVE

2.2-MHz wide-VIN, synchronous boost controller with output voltage tracking

Approx. price (USD) 1ku | 1.593
LM51521-Q1 NEW
LM51521-Q1 ACTIVE

Automotive 2.2-MHz wide VIN low IQ synchronous boost controller with disabled bypass mode

Approx. price (USD) 1ku | 1.18
LM5152-Q1 NEW
LM5152-Q1 ACTIVE

Automotive 2.2 MHz wide VIN low IQ synchronous boost controller

Approx. price (USD) 1ku | 1.28
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Power trends

Low quiescent current (IQ)

Your power design requires efficiency across the entire load range to extend battery life. Our low IQ boost devices minimize the amount of current draw out of the battery at ultra-light loads or even when the devices are not switching.

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White paper
Overcoming Low-IQ Challenges in Low-Power Applications (Rev. A)
This paper examines the need for and associated challenges and solutions to reduce quiescent current (IQ).
PDF
Analog Design Journal
IQ: What it is, what it isn’t, and how to use it
A device’s quiescent current, or IQ, is an important yet often misused parameter for low-power, energy-efficient designs. Learn more about IQ, what it is and what it isn't, in this article. 
PDF
Featured products for low quiescent current (IQ)
LM5123-Q1 ACTIVE 2.2MHz wide VIN low IQ synchronous boost controller
LM5150-Q1 ACTIVE Automotive 1.5-V to 42-V VIN, low IQ boost controller with 6.8V, 7.5V, 8.5V, 10.5V output options
LM51501-Q1 ACTIVE Automotive 1.5-V to 42-V VIN, low IQ boost controller with 6V, 6.5V, 9.5V, 11.5V output options
Low EMI

Mitigating boost regulator EMI is a major challenge for many power supply designs. Our devices and EMI mitigation designs are validated for required IEC and CISPR standards to minimize EMI, output ripple and audible noise when using a DC/DC switcher. Our industry-leading, dual, random spread-spectrum technology mitigates EMI by spreading energy in multiple bands of interest using two random frequency generators.

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Technical article
Introduction to EMI: Standards, causes and mitigation techniques
Spread spectrum techniques are commonplace in switch mode controllers and converters, and serve the purpose of reducing the effect of electromagnetic interference (EMI) that switchers generate.
Application note
EMI Reduction Technique, Dual Random Spread Spectrum (Rev. A)
Spread spectrum techniques are commonplace in switch mode controllers and converters, and serve the purpose of reducing the effect of electromagnetic interference (EMI) that switchers generate.
PDF
White paper
Time-Saving and Cost-Effective Innovations for EMI Reduction
Under such constraints to improve functionality, reducing the effects of electromagnetic interference (EMI) becomes a critical system design consideration. Read more here.
PDF
Featured products for low EMI
LM5123-Q1 ACTIVE 2.2MHz wide VIN low IQ synchronous boost controller
LM5156-Q1 ACTIVE 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum

Technical resources

Application note
Application note
How to Design a Boost Converter Using the LM5156 (Rev. A)
This document explains step-by-step instructions to design a boost DC/DC regulator with the LM5156 boost controller.
document-pdfAcrobat PDF
Application note
Application note
How to Design an Isolated Flyback Using LM5155 (Rev. A)
Learn how to design a flyback DC/DC regulator with the LM5155 boost controller.
document-pdfAcrobat PDF
Application note
Application note
AN-1484 Designing A SEPIC Converter (Rev. E)
This document explains important design considerations when implementing a SEPIC DC/DC regulator with a 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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