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.

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...

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...

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...

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...

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...

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...

>> 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...

>> SEE ALL

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...

Converters come in low-profile half bricks

The first entries in Artesyn’s ADH700 series of 700-W DC/DC converters furnish a 28-V nominal output for telecom and wireless applications. Read More...

Supplies conserve space on DIN rail

Low profile, narrow-width AC/DC power supplies in the DRL series from TDK-Lambda offer four power levels ranging from 10 W to 100 W. Read More...

35-A buck converter is stackable

Texas Instruments’ TPS546C23 synchronous DC/DC converter offers full differential remote-voltage sensing and PMBus telemetry support. Read More...

Medical supplies provide up to 18 W

Single-output, wall-mount AC/DC power supplies in the ACM series from XP Power meet DOE Level VI and CoC Tier 2 efficiency standards. Read More...

Stacked inductor keeps regulator cool

A 40-A step-down switching regulator, the LTM4636 from Linear Technology delivers 40 W with only a 40°C rise over ambient temperature. Read More...

Switchers improve efficiency in marine tasks

Powerbox expands its Marine PT57x line of switching power supplies with four units that deliver 50% extra peak current for 10 seconds. Read More...

SiC MOSFET handles 1000 V

Richardson RFPD offers the C3M0065100K silicon-carbide MOSFET for electric-vehicle charging systems and three-phase industrial power supplies. Read More...

Buck-boost controller achieves high efficiency

Combined with four external N-channel MOSFETs, the LT8390 four-switch DC/DC controller from Linear Technology delivers up to 400 W. Read More...

Reference boards ease inverter designs

Six reference boards from Rohm demonstrate the company’s 600-V fan-motor drivers to simplify inverter configuration in home appliances. Read More...

Micropower regulator hits 93% efficiency

Linear Technology’s LT8630 step-down switching regulator delivers up to 600 mA of continuous output current to voltages as low as 0.8 V. Read More...

Tiny supplies deliver up to 5 W

AC/DC power supplies in the PBO-3, PBO-3-B, and PBO-5 series from CUI come in open-frame single-in-line packages that need little board space. Read More...

Regulator allows current sharing to 180 A

Housed in a small BGA package, the LTM4647 DC/DC step-down regulator from Linear Technology delivers 30 A of output current. Read More...

EDN Hot 100 products of 2016: Power

This section of EDN's Hot 100 Products of 2016 includes power-related transistors, converters, regulators, and ICs. Read More...

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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

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...

Wireless battery management systems highlight drive for higher reliability

Wireless battery management systems promise to improve safety and reliability of the full battery system. Read More...

Improper power sequencing in op amps: Analyzing the risks

In systems with multiple supply voltages, operational amplifier power supplies must be established simultaneously with, or before, any input signals are applied. If this doesn’t happen, overvoltage and latch-up conditions can occur. Read More...

Digital control enables high reliability DC-DC power conversion with active snubbing

This paper takes a closer look at preventing a voltage excursion with special emphasis on eliminating reverse recovery losses of parasitic diodes in MOSFETs that provide several other added benefits. Read More...

>> SEE ALL

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...

Inspiration from Chinatown

A P.I. trick from a classic movie inspires a cheap battery-monitoring alternative to test a circuit. Read More...

The ever-moving goalposts of efficiency standards for external power supplies

Various authorities have introduced a succession of standards that seek to impose tighter requirements on the efficiency of external power supplies. Read More...

Did power problems help kill the modular smartphone?

Modular, flexible, and expandable sound like great product attributes, but they bring a large list of electrical, power, mechanical, and software headaches to a design. Read More...

Why is everything junk? (Heat-pump edition)

No matter how wonderful today's high-technology products seem to be, they're almost invariably hobbled by design faults. I ponder why that might be, and discuss a specific product. Read More...

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