December 2019 Tech Focus

DC/DC CONVERTERS

DC/DC converter manufacturers are offering a variety of devices with a range of capabilities, ranging from low-power devices for IoT and wearable applications to high-power modules that can power servers as well as storage and network equipment. In related news in addition to the product sampling provided here, Renesas at Arm TechCon 2019 in October demonstrated energy harvesting with its silicon-on-thin-buried-oxide (SOTB) technology (www.renesas.com/SOTB). The company’s SOTB smart-farming proof-of-concept demonstration featured an ultralow-power SOTB R7F0E embedded controller and ultralow-quiescent-current DC/DC converter to manage energy harvested from ambient-energy sources such as wind, light, vibration, and flow.

High-isolation DC/DC converters

TRACO POWER has announced the release of the TRI Series high-voltage DC/DC converters in five power ranges. The 3.5-, 6- and 10-W models feature 7,071-VDC I/O isolation/9,000-VDC peak isolation up to one second in a compact DIP-24 package. The 15- and 20-W models feature 5,940-VDC I/O isolation/8,000-VDC peak isolation up to one second in a compact 2-in. x 1-in. footprint. All models feature a 1,000 VAC working voltage and common-mode transient immunity (dv/dt) of 15 kV/µs. Each TRI Series power level consists of 15 standard models with 9- to 18-VDC, 18- to 36-VDC, or 36- to 75-VDC Input options and output voltages of 5 V, 12 V, 15 V, ±12 V, or ±15 V. (The 3.5-W models have five more models with a 4.5-VDC to 9-VDC input range). TRACO POWER

Quad DC/DC step-down micromodule

Analog Devices has announced the LTM 4668A quad DC/DC step-down μModule (micromodule) regulator with 1.2-ADC current per output. Outputs can be paralleled in an array for up to 4.8-A capability. Included in the package are the switching controllers, power FETs, inductors, and support components. Operating over an input voltage range of 2.7-V to 17 V, the LTM4668A supports an output voltage range of 0.6 V to 5.5 V. Only bulk input and output capacitors are needed. The device supports frequency synchronization, PolyPhase operation, selectable Burst Mode operation, 100% duty cycle, and low IQ operation. Its high switching frequency and a current-mode architecture enable a fast transient response to line and load changes without sacrificing stability. Fault-protection features include overvoltage, overcurrent, and overtemperature protection. Analog Devices Inc.

80-W DC/DC converter

Cosel Co. Ltd. has announced the release of a high-reliability 80-W DC/DC converter, the MGF80. Packaged in an industry-standard 2-in. x 1-in. 6-sided, shielded metallic case, the MGF80 Series has been designed with a failure rate below 30 ppm. The MGF80 does not include aluminum or tantalum capacitors. Addressing a range of demanding applications, the MGF80 Series is available in two input voltages: 9 V to 36 V and 18 V to 76 V. A single output version, the MGFS80, is available in four output voltages, 3.3, 5, 12, and 15 V, and can be adjusted within a range of ±10% using a resistor bridge or potentiometer. A dual output version, the MGFW80 is available in two factory-trimmed output voltages, ±12 V and ±15 V. Cosel Co. Ltd.

DC/DC power module

Würth Elektronik announced that its MagI³C-VDMM (Variable Step Down Micro Module) power module family is now supplemented by more powerful 1-A and 1.2-A versions. The input voltage range (from 2.5 to 5.5 V) covers the standard 3.3- and 5-V bus voltages, and the adjustable output voltage ranges from 0.8 to 5.5 V. The modules have been designed for high efficiency in the low-load range. Integration of the DC/DC converter and coil makes for a compact solution in an LGA-6EP package. The MagI³C-VDMM Series is suitable as a replacement for linear regulators. Applications include the supply of interfaces, microcontrollers, microprocessors, DSPs, and FPGAs. Thanks to their small size and high efficiency (over 96%), they are suitable for use in mobile and battery-powered devices. Würth Elektronik

2,200-W DC/DC power supply

Bel Power Solutions has announced the PES2200-12-080ND 2,200-W DC/DC power supply that converts -40 to -75 VDC into an insulated main output of +12 VDC with full digital control for servers, storage, and networking equipment and other high-availability applications. The DC-input module uses an interleaved forward converter topology with active clamp and synchronous rectification to reduce component stresses, thus providing increased system reliability and high efficiency. An active OR-ing device on the output ensures no reverse load current and renders the supply suitable for operation in redundant power systems. Measuring 80 mm x 40 mm x 195 mm, the PES2200 Series has a of 59-W/in.³ power density and provides a 12-V output plus an always-on 12 V standby output at 3.5 A. Bel Power Solutions

Buck-boost converters

Texas Instruments has introduced a family of four high-efficiency, low-quiescent-current buck-boost converters that feature tiny packaging and require minimal external components for a small solution size. The integrated TPS63802, TPS63805, TPS63806, and TPS63810 DC/DC noninverting buck-boost converters offer wide input and output voltage ranges that scale to support multiple battery-driven applications. Each of the devices in the family automatically selects buck, buck-boost, or boost mode according to the operating conditions. The devices offer a 1.3-V to 5.5-V input and 1.8-V to 5.2-V output voltage range, which helps engineers speed their designs and encourages reuse across multiple applications. Texas Instruments

Converter for IoT, wearables

ROHM has announced the availability of a buck-boost DC/DC converter with integrated MOSFET, the BD83070GWL, which is suitable for IoT applications, wearables, and portable devices. It complements the company’s high-efficiency, low-power boost (BU33UV7NUX) and buck (BD70522GUL) power-supply ICs. The BD83070GWL was developed for low-power eco-friendly devices used in compact battery-driven applications. The built-in low-R_DS(on) MOSFET and low control-current circuitry achieve a power-conversion efficiency of 97% during operation (at 200-mA load current) along with 2.8-μA quiescent current consumption. Input voltage is 2.0 to 5.5 V, output voltage is 2.5 or 3.3 V, and maximum output current is 1,000 mA. Operating frequency is 1.5 MHz. An evaluation board integrating this converter is also available. ROHM