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8 Dec 2014

4623

Linear Technology has squeezed a 3A voltage regulator into a package measuring just 6.25mm square and 1.8 mm high. The complete LTM4623 circuit only requires one input capacitor and one output capacitor, a resistor to set Vout and a small capacitor for Vout tracking and soft-start. At just 1.8mm height the regulator can be mounted on the PCB reverse side.

LTM4623 – Ultrathin 20VIN, 3A Step-Down DC/DC μModule Regulator - [Link]

4 Dec 2014

article-2014december-the-difference-between-fig7

By Steven Keeping @ digikey.com:

Switching DC-DC voltage converters (“switching regulators”) offer some key advantages over linear regulators. Chief among these are efficiency and flexibility; switching regulators can step-up (boost), step-down (buck), and invert voltages with ease. Contemporary modular chips are compact, reliable, and available from multiple suppliers (see the TechZone article “Understanding the Advantages and Disadvantages of Linear Regulators” for a full comparison between switching and linear regulators).

However, this flexibility comes at the expense of increased complexity. For an engineer familiar with the elegance of a linear regulator, designing a power supply based around a switching device can be a little daunting. The key to overcoming the challenge is an understanding of what is going on inside that little black chip.

The Difference Between Switching Regulator Continuous and Discontinuous Modes - [Link]

3 Dec 2014

32050

by linear.com:

The LT®8613 is a compact, high efficiency, high speed synchronous monolithic step-down switching regulator that consumes only 3μA of quiescent current. Top and bottom power switches are included with all necessary circuitry to minimize the need for external components. The built-in current sense amplifier with monitor and control pins allows accurate input or output current regulation and limiting. Low ripple Burst Mode operation enables high efficiency down to very low output currents while keeping the output ripple below 10mVP-P. A SYNC pin allows synchronization to an external clock.

LT8613 – 42V, 6A Synchronous Step-Down Regulator with Current Sense - [Link]

2 Dec 2014

3790

by Susan Nordyk @ edn.com

Based on a four-switch single-inductor architecture, the LT3790 synchronous buck-boost DC/DC controller from Linear Technology accommodates an input of 4.7 V to 60 V and delivers up to 250 W of continuous power for use in a variety of automotive and industrial applications. The device operates from input voltages above, below, or equal to the output voltage, making it well-suited for automotive designs where the input voltage can vary dramatically during stop/start, cold crank, and load dump.

LT3790 – 60V Synchronous 4-Switch Buck-Boost Controller - [Link]


18 Nov 2014

Figure 2x600

by Haifeng Fan @ edn.com:

Isolated DC/DC converters are required in a broad range of applications including power metering, industrial programmable logic controllers (PLCs), insulated-gate bipolar transistor (IGBT) driver power supplies, industrial fieldbus, and industrial automation. These converters often are used to provide galvanic isolation, improve safety, and enhance noise immunity. Moreover, they can be used to generate multiple output voltage rails including dual-polarity rails.

Understanding isolated DC/DC converter voltage regulation - [Link]

17 Nov 2014

od_3041_1_1416239456

by Susan Nordyk @ edn.com:

Offered with fixed output voltages of 4.75 V, 5.0 V, 5.25 V and 5.5 V or an adjustable output voltage, the MIC2875 and MIC2876 2-MHz boost regulators from Micrel are capable of supplying up to 2 A of output current, while occupying just 122 mm2 of board space. These synchronous regulators also achieve efficiency of up to 95% and are well-suited for operation from a single-cell lithium battery and providing power to applications such as USB on-the-go and HDMI hosts, tablets, and smart phones.

The low-profile devices offer bidirectional load disconnect to prevent current flow between input and output when the regulator is disabled. Under light loads, the parts reduce the switching frequency to extend battery life. Other features include bypass mode operation when the input voltage exceeds the set output voltage and an anti-ringing switch to minimize EMI issues during discontinuous mode.

Tiny boost regulators deliver up to 10 W - [Link]

10 Nov 2014

article-2014november-improved-packaging-and-fig2

by Ashok Bindra @ digikey.com:

As electronic products get smaller and better, so must the converters powering them. Besides delivering higher efficiency from a smaller footprint, these DC/DC converters must also respond rapidly to varying loads while making the system designers’ jobs simpler. Consequently, power supply makers continue to tap the benefits of advances in packaging, architecture, and semiconductor processes to further push the performance of integrated DC/DC modules in ever-shrinking packages.

Improved Packaging and Control Generates Ultra-Fast DC/DC Converter - [Link]

31 Oct 2014

In this Tech Lab, we look at the evaluation board for Micrel’s MIC45212, the 14 amp variant from their line of integrated medium voltage DC-to-DC power modules.

The MIC45 205, 208, and 212 modules integrate the inductor, PWM controller, power MOSFETs, and passives into the package. This integration reduces the total application size, simplifies the design and PCB layout, and improves reliability.

By integrating the passives, Micrel is able to effectively reduce the AC loop size when compared to a traditional regulator with passives routed on the PCB.

Tech Lab – Micrel MIC45212 Evaluation Board for Medium Voltage DC to DC Power Modules - [Link]

23 Oct 2014

Micrel 33163by Susan Nordyk @ edn.com:

Micrel’s family of low-profile step-down power modules integrates a synchronous buck regulator with an inductor into a 2.5×3×1.1-mm QFN package for the 1-A MIC33163/33164 and a 2.5×3×1.9-mm QFN package for the 2-A MIC33263/33264. The modules offer 100% duty cycle operation and accommodate an input voltage range of 2.7 V to 5.5 V.

DC/DC buck power modules fit tight spaces - [Link]

6 Oct 2014

The_batteryless_UPS_for_the_Raspberry_Pi_USB_DSC02727b-672x372

by juice4halt.com:

The Juice4Halt module is a supercapacitor based energy storage. It contains two independent DC/DC converters. The first one is a bidirectional step-up/step-down converter working as the interface between the stable 5V supply rail and the supercapacitor. During charging the converter works in step-down mode and transports energy from the external power supply to the supercapacitor. In case of a power failure the load device (Raspberry Pi or another SBC) is supplied from the supercapacitor via DC/DC converter working in step-up mode.

The second DC/DC converter is a Front-end step-down converter. The only function is converting a high input voltage down to 5.1V for the 5V rail. It is necessary to use the Front-end converter in case of an external power supply.

The Batteryless UPS for the Raspberry Pi - [Link]



 
 
 

 

 

 

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