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Power Management

Steve Taranovich
Editor
In-depth technical information, product advancements, and industry news for engineers responsible for designing, specifying, or selecting power sources for electronics applications. Topics include power supplies, power management and regulation components, batteries, digital power, and alternative energy technology.

A step-by-step guide to power supply sequencing and supervision, Part 2

LTpowerPlay is the best way to interface with the LTC2937 over the I2C bus. Read More...

A step-by-step guide to power supply sequencing and supervision, Part 1

This article walks through common scenarios and how to successfully apply the features of the LTC2937 power supply sequencer and supervisor. Read More...

Is make or buy still a choice for AC/DC supplies?

The classic make-versus-buy decision for line-operated external supplies is now heavily tilted toward buy due to the many regulatory demands and constraints on supply performance. Read More...

Wireless power challenges and opportunities

Wireless power transfer technology is destined, in the very near future, to rock the electrics and electrical world we live in. Read More...

Listening for short circuits

When troubleshooting, it pays to listen, especially when your ears are about the only diagnostic tool you have and a teen’s social life is on the line. Read More...

Selecting a space-grade isolated DC-DC

Selecting the most appropriate DC-DC for your project requires the consideration of many factors: first and foremost, what are the specific power, voltage, and current requirements? Read More...

December 1, 1995: EDN launches this site

EDN launched ednmag.com in December 1995. Eighteen years later, edn.com stood alone. Here's how it came about and what it looked like along the way. Read More...

Noise sensitive applications want ultralow noise LDO regulators

LDO design must be robust and contain all of the protection features needed to absorb the punishment from its environment while protecting the load. Read More...

Protect your boost converter

This Design Idea addresses boost converters’ inherent short-circuit vulnerability while also providing reverse-polarity protection. Read More...

Samsung Galaxy Note 7: Explosion diagnosis and prevention

Samsung's Galaxy Note 7 woes are only the latest in a long line of lithium-ion-battery-induced product issues, which is not expected to dissipate any time soon, and in fact may further accelerate. Read More...

Class D audio power amplifiers: Adding punch to your sound design

Learn about recent techniques that improve different aspects of class D amplifier performance. Read More...

Body diodes simplify UPS & energy recovery circuits

This circuit sketch shows how to turn body-diode lemons into lemonade. Read More...

Proprietary AC/DC adapters: Good idea or nasty trick?

Those simple, often interchangeable AC/DC adapters are now neither in some cases; what's the impact on the end-user? Read More...

>> SEE ALL

Protect your boost converter

This Design Idea addresses boost converters’ inherent short-circuit vulnerability while also providing reverse-polarity protection. Read More...

Body diodes simplify UPS & energy recovery circuits

This circuit sketch shows how to turn body-diode lemons into lemonade. Read More...

LTC Design Note: Electrolytic capacitor-based data backup power solution for a 12V system with 5V to 36V input

This module provides hold-up power in e.g., embedded systems, and can also be combined with a buck-boost module for a robust power system suitable for automotive and other harsh environments. Read More...

Capacitor self-diagnostics

Electrolytic capacitors are often a system’s weak link. This Design Idea helps you keep tabs on their condition. Read More...

LTC Design Note: Ultrathin dual 2.5A or single 5A μModule regulator fits on the backside of PCBs, allowing space on the topside for digital ICs

This versatile DC-DC excels where height is limited and multiple ganging options are advantageous. Read More...

LTC Design Note: 42V quad monolithic synchronous step-down regulator with 30μA quiescent current

This circuit impresses with four 2.2MHz bucks in a tiny package. Read More...

Charge-pump topology doubles voltage, breaks DC path

This unusual charge-pump voltage multiplier Design Idea not only doubles the input, but has a pseudo-floating output. Read More...

LTC Design Note: Dual 9A, step-down μModule regulator with digital power system management

This power micro-module includes voltage control and telemetry readback (including temperature, Vin/out, & Iin/out) via PMBus. Read More...

Circuit delivers constant power to a load

Here’s a novel way to supply constant power to an ill-defined load. Read More...

LTC Design Note: Determine balancing current for the LTC3305 lead-acid battery balancer

Delve into PTC thermistor intricacies to optimize battery-balancing designs. Read More...

LM317 smooths but doesn't regulate

I once needed to clean up a power supply output, but it didn't need to be regulated. Read More...

UVP protects rechargeable batteries

Protect rechargeable batteries from deep discharge with this UVP & load switch. Read More...

LTC Design Note: Monolithic linear battery charger operates from inputs up to 60V

For lower current, keep-alive battery charging, a simple yet richly featured linear solution can be ideal. Read More...

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Step-down converter minimizes EMI

Accepting an input of 3.6 V to 30 V, the R1275 DC/DC converter from Ricoh uses a spread spectrum clock generator to reduce EMI noise. Read More...

PoE controller operates autonomously

Intended for power-sourcing equipment, the LTC4279 PoE controller from Linear Technology delivers up to 123 W of power over CAT-5e cable. Read More...

Buck converter employs coreless design

Powerbox’s GB350 coreless buck converter module operates safely when exposed to high radiation magnetic fields of up to 4 Tesla. Read More...

POL converters boast high current density

Occupying just 1.5 square inches of board space, the iJC series of DC/DC converters from TDK-Lambda delivers 100 A of output current. Read More...

IC measures battery state-of-charge

Working with any battery chemistry or capacity, the LTC2944 from Linear Technology makes direct measurements of 3.6-V to 60-V battery stacks. Read More...

Intelligent modules handle up to 100 W

STMicroelectronics has added four intelligent power modules to its SLLIMM nano series offering current ratings of 1 A or 2 A. Read More...

WattUp IC enables wireless charging

The DA4100 RF-transmit IC from Dialog Semiconductor simplifies the implementation of compact WattUp-based wireless power transmitter systems. Read More...

DC/DC converters target IGBT semiconductors

Miniature DC/DC converters in the IG275E series from MicroPower Direct provide the isolated gate drive required for controlling IGBT modules. Read More...

PMIC meets automotive demands

A multiphase 12-A buck converter, the DA9210-A from Dialog Semiconductor targets next-generation infotainment systems in connected vehicles. Read More...

Sinewave inverter produces 400 VA

The CSH-400-F6 industrial DC/AC inverter from Absopulse converts a 600-VDC nominal input to an isolated sinewave output of 115 VAC or 230 VAC. Read More...

MOSFETs serve flyback topologies

Infineon’s 700-V CoolMOS P7 family of MOSFETs allows flyback-based chargers to achieve up to 3.9% higher efficiency. Read More...

Switcher ICs offer system-level protection

Offline switcher ICs in the LinkSwitch-XT2 family from Power Integrations target isolated and non-isolated flyback applications. Read More...

eCall battery charger cuts leakage current

Intersil’s ISL78693 3.6-V single-cell battery charger increases the life of LiFePO4 backup batteries used in automotive eCall systems. Read More...

60-V boost controller touts I/O protection

A multiphase synchronous boost DC/DC controller, the LTC3897 from Linear Technology, packs an input surge stopper and ideal diode controller. Read More...

DIN supplies push efficiency to 93%

TDK-Lambda’s DRB480 AC/DC power supply delivers up to 480 W from a metal DIN rail-mount case that is 84-mm wide, 124 mm deep, and 125 mm high. Read More...

Encapsulated AC/DC modules supply 80 W

Single-output power supplies in XP Power’s ECE80 series achieve high power density in a compact format for PCB, chassis, or DIN-rail mounting. Read More...

>> SEE ALL

Teardown: Is the Mighty Charger a good investment?

Is a charger for alkaline batteries a good investment? And what internal circuitry helps it accomplish this objective? This review and teardown project attempts to answer both questions. Read More...

Teardown: Apple iPhone 6 Plus battery

A look at Apple's iPhone 6 battery helps nail down the one variable that determines manufacturing cost. Read More...

Teardown: Cell-phone charger: nice idea done right

The Mophie juice pack powerstation mini smartphone and USB-device battery charger demonstrates the ability to provide more than twice the battery life to your smartphone while still keeping a low-profile shape that slips right into your pocket. Read More...

Teardown: Gigabit Ethernet switch shut down by lightning strike

A lightning bolt-generated EMP may have entered through the switch's port(s) and KO'd the controller inside. What are your theories? Read More...

Teardown: Samsung Galaxy S4

TechInsights examines the innards of Samsung's latest and greatest smartphone. Read More...

Cell-phone charger: nice idea, bad implementation

Now and again you come across a device that’s so simple, useful, and functional that you’re glad to add it to your already-overladen workbag; that is, until it breaks, for the dumbest of design reasons. Read More...

Teardown: The power inverter - from sunlight to power grid

This teardown of a solar inverter card traces the path of harvested DC power from the photovoltaic panel, through boost conversion, power inverter and massive filtering of the created AC power signal required by the power grid. Surrounded by monitoring and microcontroller magic along with safety standard adherence, we uncover the mysteries of solar energy harvesting electronics. Read More...

Evaluate your application's energy-harvesting vibrational profile with a Slam Stick

To know whether your application is suitable for vibrational energy harvesting, you must determine its vibrational profile. Mide Technology's Slam Stick data logger and open-source software can ease your profiling task. Read More...

What's inside a smart meter? iFixit tears it down

When iFixit's Kyle Wiens had the opportunity to tear down an Elster smart meter, he jumped at it—not to come up with a repair manual but to evaluate the health and safety issues that seem to surround the utilities’ installation of smart meters. Read More...

Simple battery technology packs in more features with complex chemistries

The basic components are the same across all rechargeable lithium-ion cells, the workhorses of portable energy storage. Read More...

>> SEE ALL

A step-by-step guide to power supply sequencing and supervision, Part 2

LTpowerPlay is the best way to interface with the LTC2937 over the I2C bus. Read More...

A step-by-step guide to power supply sequencing and supervision, Part 1

This article walks through common scenarios and how to successfully apply the features of the LTC2937 power supply sequencer and supervisor. Read More...

Wireless power challenges and opportunities

Wireless power transfer technology is destined, in the very near future, to rock the electrics and electrical world we live in. Read More...

Noise sensitive applications want ultralow noise LDO regulators

LDO design must be robust and contain all of the protection features needed to absorb the punishment from its environment while protecting the load. Read More...

Class D audio power amplifiers: Adding punch to your sound design

Learn about recent techniques that improve different aspects of class D amplifier performance. Read More...

The evolution of high voltage digital power system management

A new step-down controller takes inputs up to 60V and produces two 0.5V-to-13.8V outputs, enabling it to easily drop into industrial, server, and automotive environments as an intermediate or POL supply. Read More...

Bi-directional DC/DC power supplies: Which way do we go?

The bi-directional DC/DC converter has been around for a while, but new applications are quickly emerging which necessitate the use of this architecture in so many more systems. Read More...

Next generation router and switch platforms demand flexible DC/DC controllers

The increasing complexity and scalability being found in the next generation of routers and switches has exerted pressure on power supply manufactures to improve efficiency, reduce solution size, and to provide flexible solutions that can be scaled across multiple platforms. Read More...

Wearables enhance the human condition with efficient, low power conversion ICs

No longer just a device you’d only see in a cool science fiction movie, wearable devices are here to stay. Read More...

Utilizing GaN transistors in 48V communications DC-DC converter design

This article compares the efficiency of GaN to that of the latest generation MOSFETs with design details and test results. Read More...

>> SEE ALL

New Ecodesign Working Plan presents new energy efficiency priorities

Late last year, the European Commission published its long-awaited Ecodesign Working Plan, which presents new energy efficiency priorities. Read More...

Is make or buy still a choice for AC/DC supplies?

The classic make-versus-buy decision for line-operated external supplies is now heavily tilted toward buy due to the many regulatory demands and constraints on supply performance. Read More...

Listening for short circuits

When troubleshooting, it pays to listen, especially when your ears are about the only diagnostic tool you have and a teen’s social life is on the line. Read More...

Selecting a space-grade isolated DC-DC

Selecting the most appropriate DC-DC for your project requires the consideration of many factors: first and foremost, what are the specific power, voltage, and current requirements? Read More...

December 1, 1995: EDN launches this site

EDN launched ednmag.com in December 1995. Eighteen years later, edn.com stood alone. Here's how it came about and what it looked like along the way. Read More...

Samsung Galaxy Note 7: Explosion diagnosis and prevention

Samsung's Galaxy Note 7 woes are only the latest in a long line of lithium-ion-battery-induced product issues, which is not expected to dissipate any time soon, and in fact may further accelerate. Read More...

Proprietary AC/DC adapters: Good idea or nasty trick?

Those simple, often interchangeable AC/DC adapters are now neither in some cases; what's the impact on the end-user? Read More...

EPA begins process to improve computer server efficiency

The U.S. Environmental Protection Agency (EPA) is aiming to improve the energy efficiency of future computer servers. Read More...

How to select a space-grade switching regulator

Selecting the most appropriate switching regulator requires the consideration of many factors. Which part is right for your project? Read More...

Are we ready for fusion reactors in space?

NASA has been considering fusion power for many years as a readily attainable energy through heating and confinement of a deuterium-tritium plasma until the condition at which the plasma can heat itself. Read More...

What's wrong with this MacBook Pro battery?

This laptop battery works fine to a point, and then flat-out fails, when disconnected from its AC adapter. Read More...

8 tips for effective power-integrity probing

Poor PCB layout, inadequate floor-planning, ineffective de-coupling, and weak filtering cause AC noise, interference, and transients on the power rails supplying FPGAs, ADCs, and DACs, affecting their performance. Read More...

Get ready for even smaller batteries

Button and coin cells are old news as pin cells power the latest tiny consumer products. Read More...

>> SEE ALL

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