Tag Archives: Switching

LM2596 DC-DC Converter Module Testing

LM2596Module

by Kerry D. Wong:

LM2596 based step-down DC-DC converter modules can be bought on eBay quite cheaply for around a dollar each. But how do they perform? Is it safe to use it to power your design? Let’s find out.

According to TI’s website, these LM2596 step-down (buck) regulators are sold for $1.8 each for a quantity of a thousand. So how a finished converter could be sold for just above a dollar each is quite a mystery to me. Anyway, the picture below is the board I received. It appears that there are a few variations to this design (slightly different inductor size or capacitor size/voltage rating, etc.) but they all are largely based on the reference design.

LM2596 DC-DC Converter Module Testing – [Link]

Buck converter is pin-programmable

MIC24046H TYPICAL APPLICATION_FRONT PAGE

by Susan Nordyk @ edn.com:

Housed in a tiny 3×3-mm QFN package, the MIC24046-H synchronous step-down regulator from Micrel offers efficiency of greater than 90% peak and pin-selectable output voltage, switching frequency, and current limit. A wide input voltage range of 4.5 V to 19 V makes the part useful for distributed 12-V point-of-load applications.

The switching frequency of the MIC24046-H can be programmed to one of three options: 400 kHz, 565 kHz, or 790 kHz. Programmable output-voltage choices include 0.7 V, 0.8 V, 0.9 V, 1.0 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V, while an internal divider is used to achieve ±1% voltage-output accuracy. The current limit of the regulator can be programmed to 3 A, 4 A, or 5 A.

Buck converter is pin-programmable – [Link]

Simplify DC-DC Converter Characterization

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Tupta_DC-DC_fig1_575x396

by Mary Anne Tupta @ edn.com:

DC-DC converters are widely used components that convert DC power from one voltage to another, producing a regulated output voltage. These devices are used in many electronic products, including laptops, mobile phones, and instrumentation. Like any device, DC-DC converters need to be characterized by manufacturers and by engineers evaluating them for a design.

Given the increased pressure to develop products that consume less power, design engineers are looking for ways to increase power conversion efficiencies. Thus, numerous measurements are required to characterize the electrical parameters of DC-DC converters.

Simplify DC-DC Converter Characterization – [Link]

LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter

 

TI introduces industry's first 65-V synchronous step-down converter with Fly-Buck(TM) capability (PRNewsFoto/Texas Instruments)
TI introduces industry’s first 65-V synchronous step-down converter with Fly-Buck(TM) capability (PRNewsFoto/Texas Instruments)

LM5160A 65V, 1.5A synchronous buck converter with integrated high-side and low-side MOSFETs is the industry’s highest power synchronous buck regulator and supports TI’s innovative Fly-Buck™ topology to deliver isolated bias supplies up to 15W with no opto-isolator.

LM5160A offers great flexibility which enables direct point-of-load regulation from a wide input voltage range of 4.5V to 65V and also simplifies isolated DC/DC designs by enabling very good output regulation with no opto-coupler required.

LM5160A Wide Input 65V, 1.5A Synchronous Buck / Fly-Buck™ Converter – [Link]

LT8616 – Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current

 

8616

The LT8616 is a high efficiency dual synchronous monolithic step-down switching regulator with an input voltage range of 3.4V to 42V. Its dual channel design delivers independent 2.5A and 1.5A continuous current to outputs as low as 0.8V. A dual channel synchronous rectification topology delivers up to 95% efficiency while Burst Mode operation keeps quiescent current under 6.5μA (both channels enabled) in no-load standby conditions, making it ideal for always-on systems. Switching frequency can be programmed from 200kHz to 3MHz and is synchronizable throughout this range. The LT8616’s 35ns minimum on-time enables 16V to 1.8V step-down conversions, while switching at 2MHz helps designers avoid critical noise-sensitive frequency bands, such as AM radio while having a very compact solution footprint.

LT8616 – Dual 42V Synchronous Monolithic Step-Down Regulator with 6.5μA Quiescent Current – [Link]

600 mA Constant On-Time Buck Regulator

600-mA-Constant-On-Time-Buck-Regulator-1432517217

The LM5017 is a 600 mA constant on-time synchronous buck regulator with built-in high side and low side MOSFETs. This device has a wide input voltage range from 7. 5 V to 100 V. The constant on-time control scheme used in this device doesn’t need loop compensation, delivers excellent transient response, and enables very high step-down ratios. The on-time varies inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.

600 mA Constant On-Time Buck Regulator – [Link]

Buck Converter (DC-DC)

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by xKOBAYASHIMARUx @ instructables.com:

Buck Converters are great! I use them all over the place in many of my nerdy, techy, geeky hobbiest projects. They also can commonly be referred to by other names, a DC-DC converter or a switching regulator. Essentially what it does is take some higher voltage in (higher than what you want for your project), chops it up, and pieces together a lower voltage. It might help to think of it as a transformer for DC circuits… only without the giant iron block… and without the long coils of wire… and with only 3 pins.

Buck Converter (DC-DC) – [Link]

LTC3892/LTC3892-1 – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

3892-1

The LTC®3892/LTC3892-1 is a high performance dual step-down DC/DC switching regulator controller that drives all N-channel synchronous power MOSFET stages. Power loss and noise are minimized by operating the two controller output stages out-of-phase.

The gate drive voltage can be programmed from 5V to 10V to allow the use of logic or standard-level FETs and to maximize efficiency. Internal switches in the top gate drivers eliminate the need for external bootstrap diodes.

LTC3892/LTC3892-1 – 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller – [Link]

TPS61093-Q1 Low Input Boost Converter With Integrated Power Diode

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The TPS61093-Q1 is a 1.2-MHz, fixed-frequency boost converter designed for high integration and high reliability. The IC integrates a 20-V power switch, input/output isolation switch, and power diode. When the output current exceeds the overload limit, the isolation switch of the IC opens up to disconnect the output from the input. This disconnection protects the IC and the input supply. The isolation switch also disconnects the output from the input during shut down to minimize leakage current. When the IC is shutdown, the output capacitor is discharged to a low voltage level by internal diodes. Other protection features include 1.1-A peak overcurrent protection (OCP) at each cycle, output overvoltage protection (OVP), thermal shutdown, and undervoltage lockout (UVLO).

TPS61093-Q1 Low Input Boost Converter With Integrated Power Diode – [Link]

LT8640 – 42V, 5A Synchronous Step-Down Silent Switcher

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LT8640

The LT8640 step-down regulator features Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. Its 3.4V to 42V input voltage range makes it ideal for automotive and industrial applications.

LT8640 – 42V, 5A Synchronous Step-Down Silent Switcher – [Link]