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.

Why have an internal cal lab?

Internal calibration labs can save money and you can get better service, but there is a significant up-front cost. Read More...

Semitrex reveals Tronium technology for energy saving power designs

Now that the patents have gone through, Semitrex is revealing the innovative design details that will advance the global sustainable initiative. Read More...

The Moto 360: Premature obsolescence out of design necessity?

Smart watch batteries can’t be user-replaceable without impacting their water resistance, size, and weight, which causes premature obsolescence when battery life issues occur. Read More...

Will tying tuition payments to graduate earnings discourage STEM?

Tying tuition repayment to income of graduates may be a good idea, but it may also be another case of taking advantage of engineers/scientists and their hard course of study. Read More...

Power in the supply chain from SEMICON West 2016

At SEMICON West, I experienced all of the diversified links in the chain and innovative equipment and tools that make a reliable and robust IC happen in volume. Read More...

Power system management addressing

This article presents the fundamental design principles underlying the Linear Technology PSM family, details on product family differences, and practical examples and advice. Special cases, such as invalid nonvolatile memory (NVM), will also be discussed. Read More...

EDN Must Reads: Low Power Energy

The Internet of Things (IoT), wearables, hand-held devices, 5G, portable electronics….. What do all of these have in common? The need to have their device batteries last a long, long time. Read More...

10 predictions for the next 60 years in power electronics

As we look back on 60 years of EDN, we also want to look forward to the next 60 years, so this article tries to predict what the future holds in power electronics. Read More...

Peak current mode CCM DC-DC modeling design considerations

This article discusses, step by step, the average small signal modeling of widely-used peak current mode continuous current mode DC-DC converters. 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...

Intelligent power switches for 48V battery applications

In this application note we demonstrate a way to design circuits able to drive all kinds of loads with components already in mass production, and that offer functionalities similar to those of the 12 or 24V IPS available today. Read More...

Power management lab kit series bridges theory and application

Texas Instruments has now bridged the gap between power theory and real-world applications for engineering students and industry professionals with the TI Power Management Lab Kit (TI-PMLK) series. Read More...

Apple MacBook gets a new battery

Replacing a laptop's built-in battery often isn't hard, and can tangibly extend its usable life, just make sure you've got decent tools and instructions on your hands. Read More...

The Tesla Model S, ultracapacitors, and large energy storage

Imagine EVs becoming veritable power sources through banks of power inverters in a blacked-out region, providing emergency power to hospitals, businesses, and homes until utility crews could restore power. Read More...

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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...

New slope compensation method stabilizes switchers

Add slope compensation to any switching controller and topology. Read More...

Circuit remotely adjusts PSU voltage

This DI circuit allows for remote regulator/PSU programmability or trimming. Read More...

LTC Design Note: 55V High efficiency buck-boost power manager and multi-chemistry battery charger

A versatile, efficient, multi-chemistry battery charger design operates in buck & boost modes. Read More...

Shunt circuit clips large transients or regulates voltage

This clipper/shunt Design Idea is scalable from low to very high currents. Read More...

LTC Design Note: Control the voltage of a remote load over any length of copper wire

Read about how a unique component compensates for DC conductor loss without using extra sense wires. Read More...

LTC Design Note: Dual-phase buck controller drives high density 1.2V/60A supply with sub-milliohm DCR sensing

Low output voltages and use of DrMOS integrated FETs+drivers are hallmarks of this switcher design. Read More...

AC power measurement uses PWM & PAM

Use clever pulse modulation techniques to multiply signals and measure power. Read More...

LTC Design Note: 10A μModule step-down regulator with advanced input and load protection

This switcher design has comprehensive electrical and thermal protection, and high efficiency over wide input-output ranges. Read More...

LTC Design Note: Monolithic no-opto isolated flyback converter provides versatile solution

This versatile chip handles flyback, buck, boost, and negative input, and features low standby current and up to 18W output. Read More...

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Gain-block amp operates over wide bandwidth

A 15-dB gain-block amplifier, the LTC6433-15 from Linear Technology offers high linearity and low noise over a bandwidth of 100 kHz to 1.4 GHz. Read More...

Converter meets railway requirements

The Powerbox LBVS (Low Battery Voltage Start) unit powers railway equipment when the main battery is below the minimum operating voltage. Read More...

Motor driver ICs conserve battery energy

STMicroelectronics STSPIN220, STSPIN230, and STSPIN240 single-chip motor drivers consume less than 80 nA quiescent current. Read More...

Converter minimizes quiescent current

Outfitted with a 2-A, 28-V switch, the LT8335 2-MHz step-up DC/DC converter from Linear Technology operates from an input of 3 V to 25 V. Read More...

SiC MOSFET provides high breakdown voltage

With a drain-source breakdown voltage of 1700 V, the SCT2H12NZ N-channel SiC MOSFET from ROHM is optimized for industrial applications. Read More...

Kit demos multimode wireless charger

EPC’s 9121 wireless power-charging demonstration system simplifies the evaluation process of using eGaN FETs and ICs for multimode charging. Read More...

Quarter-brick converters are MIL-qualified

Rated at 120 W, the HQA 120 series of DC/DC converters from TDK-Lambda is qualified with methods consistent with MIL-STD-883 and MIL-STD-202. Read More...

3.5-A regulator is fault-tolerant

The output of the FMEA-compliant LTM8003 buck regulator from Linear Technology stays at or below regulation voltage during a short circuit. Read More...

Nonisolated converter touts high current density

With dimensions of just 1×0.5 in. (25.4×12 mm), the LGA80D DC/DC converter from Artesyn offers two 40-A outputs that can be combined for 80 A. Read More...

IC manages battery power in wearables

Highly integrated, the STBC02 chip from STMicroelectronics embeds numerous features for energy management in wearable and portable devices. Read More...

High-power bus converter meets ICT requirements

A third-generation quarter-brick bus converter module, Ericsson’s BMR458 provides up to 650 W of output power for ICT applications. Read More...

Medical converters require little space

SIP DC/DC converters from XP Power, the IMM01 and IMM02 furnish 1 W and 2 W of output power, respectively, for use in medical applications. Read More...

Power module eases ATCA system design

An extension of Ericsson’s 3E PIM (Power Interface Module) family, the quarter-brick PIM4610PD delivers 12 A for ATCA blade servers. Read More...

ICs perform synchronous rectification

Infineon’s IR1161L and IR11688S secondary synchronous rectification controllers for SMPS applications provide 200-V direct sensing. Read More...

Regulators come in SnPb BGA packages

Linear Technology offers 53 µModule power products for applications where tin-lead soldering is preferred, such as defense and avionics. Read More...

Medical/ITE supplies deliver up to 250 W

TDK-Lambda’s CUS200M series of medical and ITE certified power supplies achieve efficiency levels of up to 94% in a 3×5-in. footprint. 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

Semitrex reveals Tronium technology for energy saving power designs

Now that the patents have gone through, Semitrex is revealing the innovative design details that will advance the global sustainable initiative. Read More...

Power in the supply chain from SEMICON West 2016

At SEMICON West, I experienced all of the diversified links in the chain and innovative equipment and tools that make a reliable and robust IC happen in volume. Read More...

Power system management addressing

This article presents the fundamental design principles underlying the Linear Technology PSM family, details on product family differences, and practical examples and advice. Special cases, such as invalid nonvolatile memory (NVM), will also be discussed. Read More...

10 predictions for the next 60 years in power electronics

As we look back on 60 years of EDN, we also want to look forward to the next 60 years, so this article tries to predict what the future holds in power electronics. Read More...

Peak current mode CCM DC-DC modeling design considerations

This article discusses, step by step, the average small signal modeling of widely-used peak current mode continuous current mode DC-DC converters. Read More...

Intelligent power switches for 48V battery applications

In this application note we demonstrate a way to design circuits able to drive all kinds of loads with components already in mass production, and that offer functionalities similar to those of the 12 or 24V IPS available today. Read More...

The Tesla Model S, ultracapacitors, and large energy storage

Imagine EVs becoming veritable power sources through banks of power inverters in a blacked-out region, providing emergency power to hospitals, businesses, and homes until utility crews could restore power. Read More...

Single-channel power supply monitor with remote temperature sense, Part 2

In an application that only has one power supply, the unused set of DAC and ADC pins on a power supply manager IC can be used to sense remote temperature. Part 2 of this series addresses transistor properties, quantization, and detecting circuit failures. Read More...

Reliability and MTBF: We think we know what we mean, but do we?

A brief refresher about the basics of reliability would seem to be in order. Read More...

Single-channel power supply monitor with remote temperature sense, Part 1

In an application that only has one power supply, the unused set of DAC and ADC pins on a power supply manager IC can be used to sense remote temperature. Read More...

>> SEE ALL

Why have an internal cal lab?

Internal calibration labs can save money and you can get better service, but there is a significant up-front cost. Read More...

The Moto 360: Premature obsolescence out of design necessity?

Smart watch batteries can’t be user-replaceable without impacting their water resistance, size, and weight, which causes premature obsolescence when battery life issues occur. Read More...

Will tying tuition payments to graduate earnings discourage STEM?

Tying tuition repayment to income of graduates may be a good idea, but it may also be another case of taking advantage of engineers/scientists and their hard course of study. Read More...

Interleaved LED drive can diminish EMI

LED displays often operate with current pulses delivered to the individual devices at some particular duty cycle. In this case, six LEDs were being pulsed in that fashion. Read More...

Battery chargers to become more efficient by 2018

Early this month, the U.S. Department of Energy published a final rulemaking describing the country’s first energy conservation standards for battery chargers. Read More...

Monkey business takes out a power grid

Power companies can be required to install blocking devices to protect large transformers and generators against EMP attacks or geomagnetic disturbances, but what about monkeys? Read More...

EPA rolls out EV charger efficiency specification draft

The EPA has published a first draft program specification focused on improving energy efficiency in Level 1 and Level 2 Electric Vehicle Service Equipment. Read More...

Workshop shows off test and measurement equipment

The Keysight Technologies TestDrive workshop shows you how to get measurements such as power integrity, power consumption, and RF spectrum, but has less hands-on time than last year. Read More...

NI introduces PXIe 7.5-digit DMM

The NI PXIe-4081 brings the accuracy of its PXI predecessor to PXI Express. Read More...

Paralleling supplies: good, bad, or ugly?

If you need more current than a single supply can provide, using several in parallel is an easy solution in some cases – but definitely not in others. Read More...

GaN RF power transistors: Not just power, but speed to L-Band and beyond

GaN power transistors have been quickly gaining momentum in the power and high frequency application space and not just overtaking Silicon in power and RF, but also GaAs in the microwave arena. Read More...

APEC 2016 – Plenty of hardware, but where was the software?

APEC continues to be heavily hardware focused, with the majority of developers trying to “build a better mousetrap” by battling the physics of power conversion to attack specific problems. What largely seems to be missing is the software to aid the physics and enhance complete power supply ecosystems. Read More...

Sensing current on the high side

Here are some ways to sense current in a supply rail, which requires care to do right. Read More...

>> SEE ALL

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