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| DC-DC Converter Boasts 4 A, 60 V Internal Switch
Analog Devices, acquired last year by Linear Technology, has announced the Power by Linear LT8364, a current mode, 2 MHz step-up DC-DC converter with an internal 4 A, 60 V switch. It operates from an input voltage range of 2.8 V to 60 V, and is suitable for applications with input sources ranging from a single-cell Li-Ion battery to multi-cell battery stacks, automotive inputs, telecom power supplies and industrial power rails. The LT8364 can be configured as either a boost, SEPIC or an inverting converter. Its switching frequency can be programmed between 300 kHz and 2 MHz, enabling designers to minimize external component sizes and avoid critical frequency bands, such as AM radio. Furthermore, it offers over 90% efficiency while switching at 2 MHz. Burst Mode operation reduces quiescent current to only 9 μA while keeping output ripple below 15 mVp-p. The combination of a small 4 mm x 3 mm DFN or high voltage MSOP-16E package and tiny externals ensures a highly compact footprint while minimizing solution cost. CONTINUE READING Power Line Inductor Targets Automotive PoC Circuits Murata Manufacturing has introduced the LQW32FT series for automotive power over coax (PoC) circuits. This inductor provides high impedance in a wide band, with an inductance of 47 µH in the 1210-inch size (3.2 mm x 2.5mm). Mass production was already started in November 2017. PoC is increasingly used with SerDes equipment in automotive applications in order to reduce weight, with a single coax cable transferring power and image data for an on-board camera. In former PoC implementations, several inductors were needed to handle the broadband signal at the circuit processor and to maintain high impedance in a wide band to separate the signal and power. The LQW32FT series allows a single inductor to replace the multiple components that were formerly necessary. This supports efforts to save space and reduce the overall size of a system, and to lower total DC resistance. CONTINUE READING | Current Issue SEE INSIDE
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Low-Power Op Amp Features Ultra-High Precision Texas Instruments (TI) has introduced an op amp that combines ultra-high precision with low supply current. The LPV821 zero-drift, nanopower op amp enables engineers to attain the highest DC precision, while consuming 60% less power than competitive zero-drift devices, according to TI. The LPV821 is designed for use in precision applications such as wireless sensing nodes, home and factory automation equipment and portable electronics. The LPV821 is a single-channel, nanopower, zero-drift op amp for "Always ON" sensing applications in wireless and wired equipment where low input offset is required. With the combination of low initial offset, low offset drift and 8 kHz of bandwidth from 650 nA of quiescent current, the LPV821 is the industry's lowest power zero-drift amplifier that can be used for end equipment that monitors current consumption, temperature, gas or strain gauges.
The LPV821 zero-drift op amp uses a proprietary auto-calibration technique to simultaneously provide low offset voltage (10 μV, maximum) and minimal drift over time and temperature. In addition to having low offset and ultra-low quiescent current, the LPV821 amplifier has pico-amp bias currents which reduce errors commonly introduced in applications monitoring sensors with high output impedance and amplifier configurations with megaohm feedback resistors.
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Win a Free Book: Microprocessor Design Using Verilog HDL! This week's newsletter raffle is a fantastic book, Microprocessor Design Using Verilog HDL, by Monte Dalrymple. Normally $45, the book shows you how Verilog hardware description language (HDL) enables you to depict, simulate, and synthesize an electronic design, therefore increasing productivity by reducing workload with any given project. Drawing ends at midnight this Friday. ENTER THE DRAWING HERE And congratulations to last week's raffle winner, Eric F., who won a 1 year subscription to Circuit Cellar. Thanks to all who participated! |
Class I and II 500 W Configurable Medical Power Supplies
TDK has announced the XMS500 series of AC-DC power supplies, rated at 500 W output power, with a Class I and Class II (no earth ground connection) construction. The series conforms to curve B conducted and radiated emissions, with a 6 dB margin and has a low leakage current of less than 150 µA. The high operating efficiency and mechanical design enables the XMS500 to operate at full load with airflow rates of just 1 m/s, reducing audible noise. Applications include home healthcare, hospital, imaging and clinical diagnostic systems in addition to industrial, test and measurement and communications equipment.
Designed as a configurable product, engineers can select from multiple standard options, to optimize both system performance and cost, without incurring development charges or minimum purchase quantities. The options include case styles (including an internal low speed fan), a choice of standby voltage, a 12 V fixed or variable speed fan supply, remote on/off, AC fail and single or dual input fuses. 12 V, 24 V, 36 V or 48 V nominal outputs are offered, with other voltages upon request.
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Voltage Regulator Offers Low Quiescent Current
Diodes Incorporated has introduced the AP7381. Operating from a wide input voltage spanning 3.3 V to 40 V, this positive voltage regulator offers ultra-low quiescent current and high accuracy, making it well-suited for use in a variety of applications ranging from USB and portable devices to energy meters and home automation.
The AP7381 is offered with fixed output voltages of 3.3 V or 5 V to power standard logic device supplies and I/O levels and can operate from an input voltage between 3.3 V and 40 V, which covers most common system power rails. The device provides excellent line and load regulation and features a low dropout voltage of typically 1,000 mV for a 3.3 V output device operating at an output current of 100 mA. An internal voltage reference ensures output accuracy at room temperature is maintained within ±2%. CONTINUE READING
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