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range from 5.5 V to 65 V, provide 1.2 A to 20 A of output current, and have a programmable switching frequency from 200 kHz to 5 MHz. The second generation of this technology, Silent Switcher 2, adds internal bypass capacitors and an integrated substrate to further improve EMI. The integrated components make low EMI designs insensitive to PCB layout, simplifying design and production, and reducing performance risks. Silent Switcher µModule step-down regulators integrate the inductor, further minimising design and production risks.

Ultralow Noise, High PSRR, Low Dropout Linear Regulators

Ultralow noise, high PSRR, low dropout linear regulators are an important part of supplying well-regulated power to precision sensors, high speed and high-resolution data converters, frequency synthesizers, and other noise sensitive devices. The Power by Linear family of positive and negative LDO regulators features products with ultralow output noise and ultrahigh power supply ripple rejection (PSRR). The LDO regulators cover a wide input voltage range, from 1.8 V to 20 V (–20 V to –1.8 V), and a wide output current range, from 200 mA to 500 mA.

Many Power by Linear LDO regulators can be easily paralleled to further reduce noise, increase output current, and spread heat over a wider area of the PCB. Additional features include programmable current limit and power good, and VIOC capability, which maximises efficiency and system transient response when the LDO regulator is used with a switching regulator.

ADI also offers a broad line of high performance linear regulators, which includes hard-to-kill high voltage PNP linear regulators.

Surge stoppers: Overvoltage and overcurrent protection

Front-end protection is especially important in tightly packed systems facing unpredictable inputs. Power by Linear surge stopper protection solutions cover the full range of surge and transient events documented in military and avionic standards, including ISO 7637-2, ISO 16750-2, MIL-STD-1275, and DO-160, without the use of bulky passive components—which do not guarantee power delivery, and can be permanently damaged when they shunt high energy to ground.

By using a MOSFET to clamp the maximum output voltage to a user-programmed level, Power by Linear protection solutions feature precise ride-through operation on transient events, ensuring reliable operation instead of disconnection. Surge stoppers also add the ability to disconnect the output on extended faults, allowing programmable current limit and undervoltage lockout, and often provide reverse battery protection when back- to-back MOSFETs are used.

To extend output current capability and reduce power loss during high voltage transients and faults, switching surge stoppers achieve high efficiency operation while providing high reliability. For example, the LTC4366 and LT4363 high voltage surge stoppers can ease MIL-STD-1275D compliance.

ADI also offers a complete line of overvoltage and overcurrent protection solutions that includes products that disconnect on fault.


The broad Power by Linear portfolio of leading-edge solutions for next-generation aerospace and defense applications features high reliability, rugged products that meet long operating life and harsh environment standards. Visit our Aerospace and Defense site for easy access to relevant product and technical design information. Additional online resources include product data sheets, an enhanced product recommended (AQEC) part list, application notes, technical articles, LTspice demo circuits, design tools, and EngineerZone®

forum. Local technical support

MIL-STD-1275D 100 V/500 ms surge stopper test using the DC2150A-C demo circuit

CIE JULYAUG21 MICROCHIP:Layout 1 14/07/2021 15:17 Page 1

experts are available to help you quickly turn design concepts into marketable, ruggedised solutions.

Components in Electronics

July/August 2021 13

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