Power Monitor, Control, and Protection

Analog Devices cable drop compensation technology provides tight load regulation solutions for long, highly resistive cables without requiring an additional pair of remote sense wires. Members of this portfolio continuously interrogate line impedance and correct power supply output voltage via a feedback loop to maintain steady voltage at the load regardless of current changes. Our devices also includes precision, high-side current sense products with current-mode output that are designed for controlling the output voltage of an adjustable power supply or voltage regulator. This can be used to compensate for drops in voltage at a remote load due to resistance in a wire, trace, or cable.

Analog Devices offers switches with internal current limiting that prevents damage to host devices from faulty load conditions. These analog switches have low on resistance and operate from input voltages as low as 2.0 V.

Analog Devices digital power system management (PSM) products help you simplify and accelerate power system characterization, optimization, and data mining during prototyping, deployment, and field operation. Our PSM products are configured and monitored through a PMBus/SMBus/ I²C digital interface. Our engineering-level development environment, LTpowerPlay^®, provides control and monitoring of power supply voltage, current, power and energy use, sequencing, margining, and black box fault log data. This industry-leading development software with graphical user interface (GUI) has been proven to support up to 256 voltage rails.

Analog Devices energy monitors provide accurate, board level energy measurements in addition to other key parameters. Internal accumulators provide accurate readings of charge energy and time, with the option of using a convenient internal crystal or a more accurate external crystal as a time base. The energy monitors in this portfolio offer current, voltage, power, charge, and energy readings for rails up to 100 V or beyond using an internal shunt regulator, while others provide parametric readings and convenient sense resistor monitoring of up to ±30 A rails with only 9 mA of offset (high dynamic range).

Analog Devices’ growing portfolio of high-side switches and MOSFET (FET) drivers provides a simple and effective solution to drive single, dual, triple, or quad N-channel or P-channel FETs. Key features include wide input range of operation, extended temperature range of operation, a powerful gate drive, and short-circuit protection.

Hot swap products from Analog Devices perform all the housekeeping functions necessary to hot swap plug-in boards. These parts also integrate with industry-leading converter and amplifier cores for power monitoring and control with patented circuitry delivering unmatched ±0.3% monitoring accuracy. These devices safely and accurately monitor the power usage in a typical server rack system, which enables operators to remotely monitor each rack individually thus saving energy and minimizing system downtimes.

Analog Devices' ideal diode bridge controllers replace the four diodes in a full-wave bridge rectifier with a low loss MOSFET to drastically reduce power dissipation, heat generation, and voltage drop. The Schottky diode bridge rectifier is a classic circuit used for full-wave ac-to-dc rectification and dc polarity correction. Due to the ~0.6 V drop of each diode, the two diodes in the I/O path dissipate power (1.2 W per ampere), radiate heat, raise the ambient temperature, and complicate thermal design. At low input voltages, the two diode drops significantly reduce the voltage available to the downstream dc-to-dc converter. Ideal diode bridges eliminate or reduce heat sinking requirements, which helps shrink the overall footprint and provides significant cost savings.

Analog Devices small form factor isolated gate drivers are designed for the higher switching speeds and system size constraints required by power switch technologies such as SiC (silicon carbide) and GaN (gallium nitride), while still providing reliable control over switching characteristics for IGBT (insulated gate bipolar transistor) and MOSFET (metal oxide semiconductor field effect transistor) configurations for high-side and low-side switches. These isolated gate drivers leverage ADI’s proven iCoupler isolation technology combined with high speed CMOS and monolithic transformer technology to enable ultralow propagation delay without sacrificing common-mode transient immunity (CMTI) performance. High pulse fidelity architecture enables motor power efficiency to meet new required efficiency levels, and superior timing performance stability reduces voltage distortion, as well as harmonic and output power content on solar inverters.

Analog Devices’ memory products consist of specialized memory featuring the 1-Wire^® interface, as well as static RAM and non-volatile RAM controllers. Our 1-Wire memory devices combine memory, mixed-signal, and secure authentication functions through a single-contact serial interface. Our NVSRAM devices feature fast reads/writes and the endurance of SRAM with the convenience of nonvolatile multiple memory configurations and package options. Our NVRAM controllers convert CMOS RAM into nonvolatile memory while optionally integrating time keeping functions.

Analog Devices power control portfolio include ideal diodes, PowerPath controllers, MOSFET drivers, bridge drivers, and other nonregulator power applications.

Analog Devices’ power monitoring ICs provide an integrated solution for digital current and voltage measurement via an on-chip, 12-bit analog-to-digital converter (ADC). Leveraging ADI’s precision analog design techniques, ADI’s products are twice as precise as competing devices, offering best-in-class accuracy (<±0.8%). The power monitors complete the industry’s only monitor and sequencer family to deliver <±1% accuracy for 2 to 12 supplies.

Analog Devices’ power over Ethernet (PoE) products encompass a wide variety of power sourcing equipment (PSE) and powered device (PD) controllers that support multiple power levels: IEEE PoE (13W, 802.3af), IEEE PoE+ (25.5W, 802.3at), IEEE PoE++ (71.3W, 802.3bt), and ADI LTPoE++ (90W) standard. Our PSE and PD controllers provide complete PoE solutions and use external components such as power MOSFETs and sense resistors to lower resistance in the power path—minimizing heat dissipation and maximizing power efficiency. In addition, our robust cable discharge protection scheme, a high abs max rating on all analog pins, wide operating temperature, and overtemperature protection all make for extremely rugged PoE solutions that meet IEC61000 cable discharge requirements that far exceed ESD and cable ESD testing levels.

Analog Devices’ PowerPath, ideal diode controllers, and load switches protect power supplies by minimizing reverse currents back into the supply and shoot-through currents between supplies. Selection of the power source can be either by the highest voltage or highest priority. For highest voltage selections, ideal diodes are employed in a diode-OR configuration. Applications include redundant supply ORing, supply holdup during input brownout, and reverse battery protection. For selection by highest priority, a prioritized PowerPath controller provides the most general-purpose and flexible solution. A prioritizer powers the system from the highest priority input that is within its valid voltage window. Applications occur in battery-equipped portable products, memory modules with capacitive holdup, and server subsystems with main and auxiliary supplies. Load switches provide reverse current flow protection for space constrained designs.

The MAX1608/MAX1609 power-plane/CardBus switches provide remote input/output expansion through an SMBus 2-wire serial interface. Each device has eight high voltage open-drain outputs that double as TTL-level logic inputs, providing continuous bidirectional capabilities. The open-drain outputs tailor the MAX1608/MAX1609 for use in load switching and other level-shifting applications as well as general-purpose I/O applications.

Analog Devices pushbutton controllers easily solve the inherent bounce problem associated with all mechanical contacts while enabling power supply converters and releasing a processor once the supply is fully powered up. Wide voltage operation, rugged ESD protection, small size, low quiescent current, and ease of design distinguish these pushbutton controllers from discrete implementations. All ADI pushbutton controllers feature a force shutdown fail-safe feature in case the microprocessor fails to respond to a pushbutton controller’s request to shut down.

Certain types of equipment such as telecommunications or automated test equipment (ATE) often use multiple banks of relays to achieve nearly lossless switching of almost any kind of signal. In these products, many relay coils can be supplied from a single power supply, which must be large enough to drive all the coils simultaneously. In addition, the relays can be densely packed into a very small area, making power dissipation from the coils a design concern. Analog Devices’ family of relay drivers provides high voltage, high power solutions in small form factors with high efficiency.

Analog Devices sequencers, trackers, and margining controllers provide additional functionality to one or multiple power supplies. Our sequencing controllers allow power supplies to be turned on or off in any order by adding time delays to each supply. In a tracking-based system, a master voltage rail is chosen and all of the lower voltage rails are slaved to its on-ramp or off-ramp. When testing power supplies in an automated PCB test environment, a margining controller allows power supply output voltages to be precisely adjusted up and down by sourcing or sinking current into the feedback node or voltage adjust pin of the power supply. This allows a system to test the correct operation of electrical components at the upper and/or lower power supply voltage limits specified for a given design.

Analog Devices’ growing portfolio of SilentMOS™ smart power stages provide an unrivaled integrated solution to optimize power efficiency, transient performance, and reduce EMI/EMC. Fully integrated high-speed gate drivers coupled with low resistance half-bridge power switches are augmented with accurate switch current and thermal monitoring telemetry. Combined with a suitable high frequency controller, this smart power stage forms a compact, high current voltage regulator system with state-of-the-art efficiency and transient response. SilentMOS technology utilizes second generation Silent Switcher^® 2 architecture reducing both EMI and switch-node voltage overshoot while maximizing efficiency at high switching frequencies.

Analog Devices power supply voltage monitors and microprocessor supervisors monitor positive and negative power supplies, with integration of up to eight supply monitors in a tiny package. These devices generate a reset signal if any power supply goes above or below the user-defined threshold. Reset times are usually fixed at 200 ms or are adjustable with a single capacitor. Aside from power supply monitoring, CPUs and ASICs can also be supervised by an integrated watchdog timer.

Analog Devices’ family of high voltage surge stoppers, overvoltage protection, overcurrent protection, and circuit breaker ICs offer solid front-end protection in small, low power, easy to design solutions that increase system reliability. Circuits can be designed to meet many of the automotive, military, and avionic standards including ISO 7637-2, MIL-STD-1275, and DO-160. Our portfolio defends against transient voltage surges and helps ensure reliable operation throughout the event, helping engineers trying to overcome the difficult challenge of protecting sensitive electronics. Different combinations of undervoltage, overvoltage, overcurrent, and reverse input protection allow optimization of function, size, and cost requirements. Our surge stoppers allow uninterrupted system operation through voltage surges, whereas our protection controllers immediately disconnect the input from the output during faults.

Analog Devices Thermoelectric Cooler Controllers work with cooler based photonics, offer the smallest size, the best efficiency and the most robust solutions. It has a linear power stage with the linear driver output and a pulse width modulation power stage with the SW output. Depending on the part number, it offers digital PID control or analog PID control or both. Our TEC controllers support a variety of MSA based optical modules such as SFP, SFP+,QSFP+, CFP/CFP-2/CFP-4 and QSFP28.

Analog Devices’ wide range of USB products enable the high signal integrity and broad interoperability needed to solve key data and power requirements when implementing USB interface connections. Our USB power switches protect USB ports and provide current limiting up to 4 amps, and are compliant to all USB specifications. Our AECQ-100 qualified USB switches are designed for use in automotive applications.