监控器与复位
产品（118)
AD8436ACPZ-R7 - 20MHz True RMS-to-DC Converter | Analog Devices
The Analog Devices AD8436ACPZ-R7 is a new-generation, translinear precision, low-power true RMS-to-DC converter that delivers a precise DC equivalent of the RMS value of complex AC waveforms, including switch-mode power supply and triac-derived signals. It offers 0.25% (B-grade) or 0.5% of reading accuracy across a wide dynamic input range of 3 mV RMS to 3 V RMS full-scale, with larger inputs supported via external attenuators. The device is housed in a 20-pin LFCSP (4 mm x 4 mm) package with an exposed pad. A true RMS-to-DC converter is an analog computing block that continuously extracts the root-mean-square energy of an arbitrary AC waveform and presents it as a stable DC voltage proportional to the signal's heating power. Unlike average-responding or peak-responding detectors, true RMS converters correctly measure signals with non-sinusoidal content such as PWM drive outputs, SCR phase-angle waveforms, and switching-converter ripple. The AD8436 belongs to the category hierarchy of RMS-to-DC converter -> AC measurement IC -> data acquisition -> signal chain -> power management specialized IC. Key features include a 20 MHz bandwidth, sub-100 microsecond settling at high input levels, an on-board output buffer amplifier, and an optional averaging capacitor that lets the user trade ripple versus settling time. The AD8436 also provides a peak-mode/average-mode option, allowing it to deliver average rectified value when required. Operating from a single supply of 4.5 V to 36 V (or dual +/-5 V to +/-18 V), and consuming only 365 microamps of quiescent current, the part is engineered for battery-powered and industrial-grade instrumentation. Technically, the AD8436 uses a proprietary translinear gain cell and matched monolithic transistor array to compute the implicit square, mean, and square-root functions in a single chip, eliminating the need for an external log-antilog circuit. The on-chip buffer allows direct drive of low-impedance loads, 1 mA or higher, while preserving DC accuracy. Typical applications include power-line monitoring, switch-mode power supply output sensing, industrial process-control instrumentation, audio amplitude metering, RF transmitter envelope detection, and precision multimeter AC sections. The wide supply range supports 24V industrial bus rails and 48V telecom input monitoring without external regulators. Designers should note that the on-chip averaging capacitor pin must be paired with the correct external capacitor value to control ripple and settling time. The exposed pad on the LFCSP package must be soldered to a copper pour for thermal dissipation and to achieve the stated bandwidth. This page consolidates distributor pricing, true drop-in alternatives, and design notes that go beyond the manufacturer datasheet to support faster component selection.
ADM705ARZ-REEL - 4.65V Microprocessor Supervisor | Analog Devices
The Analog Devices ADM705ARZ-REEL is a low-cost microprocessor supervisory circuit that monitors a 4.65V threshold and provides an active-low push-pull reset output, housed in an 8-pin SOIC (R-8) package and supplied on a 2500-piece tape-and-reel. It is designed for 5V power supply/battery monitoring in microprocessor-based systems and generates a reset during power-up, power-down, and brownout conditions. A microprocessor supervisor (also called a voltage supervisor or reset IC) is a power-management IC that watches the system supply rail and asserts a reset signal to the host processor whenever the rail falls below a preset threshold. This prevents code execution at unsafe voltages, which can lead to corrupted flash, latched peripherals, or indeterminate logic. Supervisors sit in the power-management IC hierarchy between simple voltage detectors and full PMICs, and are essential building blocks in any MCU/MPU-based design. Key features include a guaranteed valid RESET output with VCC as low as 1V, 190 µA typical quiescent current, a 200 ms reset pulse width, a 160 ms minimum reset timeout, and a debounced TTL/CMOS manual reset (MR) input. The reset output uses a push-pull totem-pole stage, eliminating the external pull-up resistor that open-drain alternatives require. The part is specified over the -40 °C to +85 °C industrial temperature range and ships in Pb-free/RoHS-compliant packaging. The ADM705 family shares its pinout across the ADM705/ADM706/ADM707/ADM708 series, allowing the designer to substitute parts to trade watchdog timing, or push-pull/open-drain output polarity, without re-laying-out the PCB. This drop-in compatibility, combined with low quiescent current and 1V-reset-valid operation, makes the ADM705 a long-standing industry staple for 5V supervisory designs. Typical applications include reset and supply monitoring for 8051, PIC, AVR, MSP430, and ARM Cortex-M microcontrollers, embedded industrial controllers, point-of-sale terminals, automotive body electronics, and battery-backed systems. The wide operating range and high noise immunity also suit it to noisy motor-control and SMPS post-regulation environments. When designing with this device, place the 1 µF bypass capacitor as close as possible to VCC and route MR with a short, debounced trace. Note that the ADM705 does not include a watchdog timer - choose the ADM706 if watchdog functionality is required.
AMC0380D - ±400V AC-Input Reinforced Isolated Amplifier | TI
The Texas Instruments AMC0380D is a precision, galvanically isolated amplifier with a high-voltage AC input, high input impedance, and fixed-gain differential output. It integrates a high-voltage resistive divider, enabling direct AC voltage sensing without external resistors. The device operates with a high-side supply (VDD1) of 3.0V to 5.5V and a low-side supply (VDD2) of 3.0V to 5.5V, in a 15-pin SSOP package with 0.65mm pitch, and is fully specified over -40C to +125C. An isolated amplifier is a signal-conditioning IC that provides galvanic isolation between its input and output, protecting low-voltage circuitry from high-voltage transients and ground loops. In the analog front-end (AFE) hierarchy, it sits between raw high-voltage sensing points and system ADCs or MCUs, and is essential in motor drives, grid infrastructure, solar inverters, and power monitoring where safety isolation and accuracy are paramount. Key features include a linear input range of +/-400V with 8.3M-ohm input impedance, an integrated high-voltage resistive divider that eliminates external resistor networks, and a second-order delta-sigma (Delta-Sigma) modulator architecture for high resolution and strong noise immunity. The fixed-gain differential output simplifies interfacing with downstream ADCs and microcontrollers, while reinforced isolation provides robust protection against high-voltage transients. Technically, the input stage drives a second-order Delta-Sigma modulator whose bitstream crosses the isolation barrier, ensuring excellent linearity and low offset drift over temperature. The differential output preserves signal integrity across the barrier and rejects common-mode noise on the low side. Typical applications include AC phase-voltage sensing in three-phase motor drives, grid-tied solar inverters, and power quality monitoring, where the wide +/-400V input range removes the need for additional scaling circuitry. When designing with the AMC0380D, maintain isolation creepage and clearance on the PCB, keep the device near the sensing point, and add a low-pass filter on the differential output to suppress modulator noise.
BD49E27G-MTR - 2.7V CMOS Voltage Detector, SSOP-5 | ROHM
The ROHM Semiconductor BD49E27G-MTR is a 2.7V CMOS-output voltage detector (voltage supervisor / reset IC) housed in a 5-pin SSOP package. It belongs to ROHM's BD49E series of standard CMOS voltage detectors designed for high-accuracy voltage monitoring with low quiescent current draw. The suffix -M denotes the automotive-grade part, and -TR denotes tape-and-reel packaging, making this MPN a fully automotive-qualified, surface-mount-ready variant. A voltage detector (also called a voltage supervisor or reset IC) is a type of power management IC that monitors a system supply rail and asserts a reset signal whenever the monitored voltage drops below a precise internal threshold. Voltage detectors sit below voltage regulators and supervisors in the power-management hierarchy, and above simple comparators because they integrate an accurate bandgap reference, hysteresis, and a defined output stage. The BD49E27G-MTR uses a CMOS push-pull (totem-pole) output stage rather than an open-drain output, which means it actively drives the output high or low without needing an external pull-up resistor. Key features include a 2.7V detection voltage with high accuracy (typically ±1% across the operating temperature range), very low quiescent current (in the single-digit microamp range), a CMOS output stage that can source and sink current, and built-in hysteresis to prevent chattering near the threshold. The 5-SSOP package provides a compact footprint suitable for space-constrained designs. Automotive-grade (-M) qualification means the device has been characterized for the extended temperature ranges and reliability demanded by vehicle electronics. Typical applications include microcontroller reset supervision in automotive ECUs, body and chassis control modules, infotainment system power-good indication, battery-pack monitoring, and any 3.3V or 5V logic rail that requires a deterministic reset signal at power-up, power-down, or brownout conditions. The 2.7V threshold is particularly suited to 3.3V rails that must be considered valid only after the rail has stabilized well above its minimum operating voltage. When designing with this part, place the bypass capacitor recommended in the datasheet as close as possible to the VCC pin to prevent false triggering from supply noise. The CMOS output eliminates the need for an external pull-up but the trace from the output to the microcontroller reset pin should be kept short to minimize EMI coupling. This page synthesizes distributor pricing, lifecycle status, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
EM6151V53SO8B+ - Windowed Watchdog Supervisor, 5.3V, SOIC-8 | EM Microelectronic
The EM Microelectronic EM6151V53SO8B+ is a low-power windowed watchdog supervisor with reset and sleep-mode features, factory-set to a 5.3V threshold in an 8-pin SOIC package. According to the EM Microelectronic datasheet, this device combines voltage monitoring with software monitoring using a windowed watchdog, integrating three functions (voltage supervisor, windowed watchdog, and sleep-mode control) into a single 8-SOIC device. A watchdog timer is a hardware peripheral that monitors microcontroller activity and triggers a reset if the firmware fails to service the watchdog within a defined window. A windowed watchdog enforces both a minimum and maximum service interval, catching firmware that resets the watchdog too quickly (indicating stuck code in a tight loop) and firmware that fails to service it at all. This is critical for automotive, industrial, and safety-critical applications where firmware lockups must be detected and recovered automatically. Key specifications include a 5.3V factory-trimmed reset threshold voltage, 4.57ms typical reset pulse width, open-drain or open-collector active-low RESET output, and very low quiescent current suitable for battery-backed systems. The windowed watchdog function prevents faulty firmware from masking a system lockup by rapidly toggling the watchdog input. The sleep-mode feature allows the host microcontroller to disable the watchdog during low-power states. The EM6151V53SO8B+ uses EM Microelectronic's proprietary low-power CMOS architecture, integrating a precision bandgap voltage reference, a windowed watchdog timer, and a reset generator on a single die. The factory-trimmed threshold eliminates external resistor dividers and reduces BOM cost. The integrated architecture minimizes board space compared to discrete supervisor plus external watchdog solutions. Typical applications include embedded microcontroller supervision in industrial control, automotive body and chassis ECUs, battery-powered IoT sensor nodes, and safety-critical medical devices. The 5.3V threshold is well-matched to 5V regulated rails with tolerance headroom. The open-drain output allows wired-OR connection of multiple supervisors on a shared reset line. When designing with this device, ensure the WDI signal from the host microcontroller toggles within the watchdog window both faster than the watchdog timeout and slower than the minimum window period. Place a 0.1uF decoupling capacitor close to VCC, and use a pull-up resistor on the open-drain RESET output sized for the line capacitance and required rise time. This page synthesizes distributor pricing from DigiKey, LCSC, FPGACenter, JLCPCB, and Veswin, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
EM6151V55SO8B+ - 5.5V Windowed Watchdog Supervisor | EM Microelectronic
The EM Microelectronic EM6151V55SO8B+ is a low-power windowed watchdog supervisor with reset and sleep mode functions, housed in an 8-pin SOIC package. It combines voltage monitoring and software monitoring using a windowed watchdog, providing a high level of integration for embedded systems that require both hardware and software supervision. The device operates with a 5.5V threshold and offers an open-drain or open-collector reset output. A watchdog supervisor (also called a system supervisor or reset IC) is a dedicated integrated circuit that monitors a microprocessor or microcontroller's activity and forces a reset if the firmware fails to service the watchdog within a defined time window. Watchdog supervisors belong to the broader category of power management ICs, specifically within supervisors and reset circuits. They sit alongside voltage supervisors, battery monitors, and sequencers, providing mission-critical housekeeping functions that software alone cannot guarantee. Key features include a windowed watchdog timer that detects both premature and missing service pulses, a manual reset input, sleep mode for ultra-low quiescent current, and a single-channel open-drain reset output. The windowed watchdog ensures the host processor services the watchdog within a bounded time interval, catching both stalled code (no service) and runaway code (too-frequent service). The reset output remains asserted for a defined pulse width, allowing the system clock and supply rails to stabilize. The EM6151 architecture combines a precision voltage reference, a windowed watchdog timer block, and a low-power comparator for VCC monitoring. The 5.5V threshold variant is one of several fixed thresholds offered in the EM6151 family, selected by part number suffix. The device is designed for low quiescent current during sleep mode, enabling battery-powered applications to maintain supervision with minimal drain. Typical applications include microcontroller reset supervision in industrial controllers, embedded IoT endpoints, automotive body electronics (when paired with an automotive-qualified equivalent), and battery-powered portable instrumentation. The combination of voltage monitoring and windowed watchdog in a single 8-pin SOIC reduces BOM count and PCB footprint. When designing with this part, ensure the WDI (watchdog input) service pulse timing falls within the watchdog window, and place the decoupling capacitor close to VCC. The sleep mode requires careful sequencing to avoid unintended system lock-up. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with an at-a-glance reference for system supervision design.
H6060V14DL8A+ - Self-Recovering Watchdog Supervisor | EM Microelectronic
The EM Microelectronic H6060V14DL8A+ is a self-recovering watchdog voltage supervisor with a low-line output (SAVE feature) housed in an 8-pin DIL (Dual In-Line) through-hole package. It is a single-channel supervisor with a push-pull totem-pole reset output, designed to monitor microprocessor and microcontroller supply rails and assert a reset whenever the supply dips below a programmed threshold or when the watchdog timer expires. A voltage supervisor (also called a reset IC, voltage monitor, or power-on reset generator) is a power management IC that holds a processor in reset until the supply voltage is stable and within regulation. Supervisors sit in the hierarchy of power management integrated circuits (PMICs) and provide deterministic power-up, brown-out detection, and watchdog supervision functions that complement voltage regulators. The H6060V14DL8A+ belongs to the supervisor family, which itself is a sub-category of PMIC. Key features include a self-recovering watchdog architecture: after the first watchdog timeout the reset line goes active, then after a second timeout the reset is de-asserted - this active/inactive cycle repeats until the system recovers by servicing the watchdog. This is more robust than a simple one-shot watchdog and can recover a hung system without operator intervention. The device also provides a low-line early-warning output and an open-drain or push-pull reset output (per the published part, totem-pole push-pull). Typical applications include industrial controllers, automotive body and chassis ECUs, building automation, IoT edge nodes, and any embedded system that must recover automatically from firmware lock-ups or supply glitches. The 8-DIL through-hole package makes it easy to prototype on through-hole boards and is well-suited to harsh-environment and automotive modules that prefer leaded packages over SMD. When designing with the H6060V14DL8A+, place decoupling close to VCC, route the WDI watchdog input trace away from clock edges to avoid false triggers, and select the external timing capacitor to set the desired timeout window. The low-line output can be used as an early warning to allow the host to flush state to non-volatile memory before reset asserts.
H6060V15S - Self-Recovering Watchdog Timer IC | EM Microelectronic
The EM Microelectronic H6060V15S is a self-recovering watchdog timer supervisor IC housed in an 8-pin SOIC package, designed to monitor microcontroller activity in embedded systems and automatically recover from firmware lockups. The H6060V15S provides a watchdog timeout window with reset output, available in open-drain output configuration per the H6060V15SO8A+ variant datasheet, and is supplied in tape-and-reel packaging for high-volume manufacturing. The 8-pin SOIC footprint and the self-recovering topology make it a compact, drop-in replacement solution for legacy watchdog supervisors. A watchdog timer (or supervisor IC) is a category of power management device that monitors a microcontroller's or microprocessor's activity by requiring periodic toggling of a watchdog input (WDI) signal within a programmed time window. If the host firmware fails to respond (due to a hang, infinite loop, brown-out, or EMI-induced corruption), the watchdog asserts a reset (WDO/RESET) to restart the system. Self-recovering variants such as the H6060V15S re-trigger this cycle automatically without operator intervention, making them essential in unattended, safety-critical, or remote installations such as industrial PLCs, vending machines, and automotive body controllers. The watchdog sits in the system hierarchy below the main voltage regulator and above the MCU reset logic, forming the third tier of mission-critical supervisory functions. Key features of the H6060V15S include a low quiescent current suitable for always-on battery-backed monitoring, an open-drain or open-collector reset output for flexible interface to MCUs with mixed logic levels, and a wide operating voltage range compatible with 3.3V and 5V logic families. The watchdog timeout and reset pulse-width windows are trimmed at the factory, eliminating the need for external timing capacitors and reducing BOM cost. Architecturally, the H6060V15S integrates an internal precision oscillator, a counter/timer block, a WDI edge detector, and a reset output stage. The self-recovering behavior is achieved through internal state-machine logic that re-arms the watchdog immediately after a reset event, ensuring the host has a clean boot window. This architecture is preferred over simple RC-based external watchdogs because it provides tighter timing accuracy across temperature and supply variations. Typical applications include embedded MCU reset supervision in industrial control systems, automotive body and chassis ECUs, point-of-sale terminals, IoT edge nodes with unattended operation, and any battery-powered system that must autonomously recover from firmware faults. When designing with the H6060V15S, ensure the WDI signal from the host firmware toggles faster than the minimum watchdog window, and place a 0.1uF decoupling capacitor close to VCC. For systems requiring wider timing flexibility, an external capacitor-adjustable watchdog variant may be preferred. This page synthesizes verified distributor pricing, package-level drop-in alternatives, and practical design considerations for the H6060V15S, providing engineering value beyond the manufacturer datasheet by consolidating selection, replacement, and BOM optimization guidance into a single reference.
H6060V15SO8 - Self-Recovering Watchdog Supervisor | EM Microelectronic
The EM Microelectronic H6060V15SO8 is a self-recovering watchdog supervisor IC housed in an 8-pin SOIC package. It is designed to monitor microprocessor activity and automatically reset the system if the host MCU fails to service the watchdog within a programmed window. The device operates as part of EM Microelectronic's H6060V family of voltage supervisors and watchdog timers, providing robust brown-out and code-flow monitoring in a compact 8-SOIC outline. Background Knowledge: A watchdog supervisor is a specialized power management integrated circuit (PMIC) that observes the host processor's execution flow. Unlike a simple voltage supervisor (reset IC) that only monitors VCC levels, a watchdog timer requires the firmware to periodically toggle a watchdog input (WDI) pin. If the firmware becomes stuck (infinite loop, crash, or lock-up), the supervisor issues a reset pulse to restart the system. A self-recovering watchdog additionally clears the underlying fault condition, allowing the system to come back online without manual intervention - critical for unattended or remote installations. Key features of the H6060V15SO8 include a single-channel open-drain reset output, a low-threshold voltage detect circuit, and integrated self-recovery logic that prevents repeated fault cycling. The device is offered in an 8-pin SOIC package suitable for industrial temperature grade designs, and its open-drain output topology allows wired-OR connection with other system reset sources. The H6060V family is commonly deployed alongside main MCUs in safety-critical and industrial automation applications where a stuck firmware state must not lock the equipment permanently. Architecturally, the H6060V15SO8 integrates a precision voltage reference, a windowed watchdog counter, and a self-recovery state machine on a single die. The supervisor's windowed watchdog requires WDI activity to occur inside a tight time window - too early or too late both generate a reset - providing stronger fault coverage than a traditional time-out watchdog. The self-recovery function monitors reset duration and, after a programmed recovery interval, automatically re-enables the host and resumes normal operation. Typical applications include industrial PLC modules, building automation controllers, IoT edge nodes, automotive accessory modules, and embedded consumer devices where firmware hangs must be cleared without user intervention. The H6060V15SO8 is also used in feedback instrumentation and remote sensor platforms that must survive transient firmware faults caused by EMI or power-line glitches. When designing with the H6060V15SO8, follow the manufacturer's recommended capacitor selection on the VCC pin and observe the maximum WDI pulse-width timing budget in the datasheet. Because the reset output is open-drain, an external pull-up resistor to the system logic supply is required; verify the resistor value against the system's rise-time requirements. This page synthesizes distributor pricing, package-marking cross-reference (MMP301 and H6060V15SO8A/B variants), and practical design notes not aggregated in the manufacturer datasheet.
H6060V15SO8B+ - 6V Self-Recovering Watchdog Supervisor | EM Microelectronic
The EM Microelectronic H6060V15SO8B+ is a self-recovering watchdog supervisor with integrated reset circuit, housed in an 8-pin SOIC (SO-8, 3.90 mm body width) package. The H6060 family combines a fixed-threshold voltage detector with a watchdog timer that automatically restarts the host microcontroller after a fault, eliminating the need for external intervention in brown-out or firmware-hang conditions. A voltage supervisor (also called a reset IC or power-on reset generator) is a power management IC that monitors a supply rail and asserts a reset signal to a host processor whenever the rail falls below a safe operating threshold. Supervisors sit between the system power rail and the reset pin of a microcontroller, DSP, or ASIC, and are a foundational block of any safety-critical or battery-powered embedded design. The hierarchy is: supervisor -> reset IC -> power management IC -> semiconductor. Key features of the H6060V15SO8B+ include a 6.0 V nominal reset threshold (the V15 suffix designates this specific threshold variant), open-drain or open-collector reset output for wired-OR flexibility across multiple rails, a self-recovering watchdog with selectable timeout windows, and a wide operating supply range. According to the manufacturer description, the device is a "Self Recovering Watchdog" intended for embedded applications that require automatic recovery from transient faults without operator intervention. Architecturally, the H6060 integrates a precision bandgap reference, a comparator against the internal threshold, a programmable watchdog counter, and the open-drain output stage. The self-recovery logic retriggers a reset pulse to the host if the watchdog input (WDI) does not toggle within the programmed window - effectively acting as an autonomous watchdog supervisor. Compared to a discrete RC reset or a host firmware watchdog, this hardware implementation is independent of the same firmware that may have locked up, providing true fault-recovery capability. Typical applications include embedded automotive body modules, industrial PLCs, point-of-sale terminals, IoT edge nodes with sleep-mode cycling, and any microcontroller-based design where unattended fault recovery is required. The wide supply range also suits battery chargers and power-supply secondary-side monitoring where the supervisor itself is powered from an unregulated rail. When designing with the H6060V15SO8B+, verify that the 6.0 V reset threshold matches the lowest acceptable operating voltage of your host rail, and confirm the watchdog timeout window against the longest legitimate firmware execution path. Place the decoupling capacitor as close as possible to the VCC pin to avoid false resets on supply transients.
INA228AIDGSR - 85V 20-bit I2C Power Monitor | Texas Instruments
The Texas Instruments INA228AIDGSR is an 85 V, 20-bit, ultra-precise digital power, energy and charge monitor with an I2C interface and an alert pin, housed in a 10-pin VSSOP (DGS) package. It supports bidirectional current sensing, measures shunt voltage, bus voltage, current, power, energy and charge, and is capable of being paired with an external high-voltage E3-driver for expanded transient protection. The device accepts common-mode bus voltages up to 85 V and operates over a -40 C to +125 C temperature range. An I2C power monitor is a class of analog front-end IC that digitizes the voltage across a current-sense shunt and the supply rail, then performs on-chip arithmetic to expose current, power, energy and charge over a digital bus. The INA228 belongs to the power monitor -> current sense amplifier -> power management IC -> semiconductor hierarchy, and it is commonly deployed as the housekeeping companion to a switching DC-DC converter or a battery stack, where designers need cycle-by-cycle telemetry without burdening the host MCU with analog sampling. Key features include 20-bit delta-sigma ADC core, 85 V common-mode rating, programmable gain, alert functionality for over-current or under-voltage events, on-chip temperature sensor, and 50 uA typical quiescent current. The 10-pin VSSOP (DGS) package provides a small footprint suitable for point-of-load monitoring on dense PCBs. Technically, the device combines a high-impedance front end, precision chopper-stabilized amplifiers, and a sigma-delta modulator that oversamples the differential shunt voltage. The on-chip calibration register compensates for offset and full-scale error, and the integrated temperature sensor supports system-level housekeeping. The high common-mode range allows direct connection across high-voltage battery stacks without intermediate attenuation. Typical applications include server and telecom 48 V rails, battery management systems, industrial automation, solar power optimizers, and electric vehicle DC link monitoring. The wide 85 V common-mode range makes it suitable for high-voltage battery stacks. When designing with this part, ensure the shunt resistor is sized to keep peak differential input within the device's dynamic range, and place the shunt close to the IC input pins to minimize ground-loop errors. Use the alert pin to wake the host MCU on threshold crossings instead of polling. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet, giving engineers a faster path to selecting the right current-sense monitor for high-voltage rails.
INA237 - 85V 16-Bit I2C Power Monitor | Texas Instruments
The Texas Instruments INA237 is an ultra-precise digital power monitor with a 16-bit delta-sigma ADC, designed for current-sensing applications. It measures a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt element, with common-mode voltage support from -0.3 V to 85 V, making it suitable for both high-side and low-side current sensing on high-voltage rails. Communication is via an I2C interface with alert functionality, housed in a 10-pin VSSOP (DGS) package. A digital power monitor is an integrated power management IC that digitizes shunt voltage, bus voltage, and computed power, then reports values over a serial bus such as I2C. Within the power-monitoring hierarchy, the INA237 sits in the current/voltage/power monitor family, complementing supervisors, hot-swap controllers, and DC-DC converters in modern power management systems. Key features include high-resolution 16-bit delta-sigma conversion, current-monitoring accuracy with ±50 uV maximum offset voltage, ±0.02 uV/C maximum offset drift, and ±0.3% gain error. The 85 V common-mode withstand is a major differentiator, allowing direct monitoring of 48 V telecom, server, and industrial buses without additional level-shifting circuitry. The delta-sigma architecture provides excellent noise performance and allows configurable conversion times and averaging, trading conversion speed for accuracy. Registers report shunt voltage, bus voltage, current, and power directly, simplifying firmware. The integrated alert pin supports configurable alerts including overcurrent and overvoltage thresholds. Typical applications include 48 V server and datacenter power-rail monitoring, telecom base-station power supplies, industrial 24-85 V motor and automation systems, and battery-management telemetry in test equipment. The wide common-mode range covers virtually all common industrial and datacenter bus voltages. Design tip: choose the shunt resistor so full-scale load current generates a shunt voltage well within the ±163.84 mV range, balancing accuracy (larger shunt) against power loss (smaller shunt). For applications needing tighter accuracy, the pin-compatible INA238 offers improved offset and gain error in the same footprint.
INA381A1IDSGR - 26V 350kHz Current Sense Amp w/ Comparator | TI
The Texas Instruments INA381A1IDSGR is a 26-V, 350-kHz current sense amplifier with an integrated high-speed over-current comparator, housed in an 8-pin WSON (DSG, 2x2 mm) package. It combines a wide common-mode current-shunt monitor and a comparator with an internal 1.2V reference, producing a single-chip solution for cost-sensitive overcurrent protection. The amplifier section supports both high-side and low-side current sensing and includes internal resistor gain networks that set the fixed gains for the A1/A2/A3/A4 variants. A current sense amplifier (also called a current-shunt monitor) is a type of analog signal conditioner that measures the small differential voltage developed across an external shunt resistor in the path of a load current. The output voltage is proportional to load current, enabling the system controller to monitor power, perform closed-loop current control, or trigger protection events. The INA381 sits in the hierarchy: current-sense amplifier -> analog amplifier -> signal chain IC -> semiconductor. The integrated comparator in the INA381 lets the same device assert an ALERT output when current exceeds a user-defined threshold, eliminating a separate comparator IC and shrinking the BOM in motor drive, hot-swap, and power-supply protection circuits. Key features of the INA381A1 include a 26 V common-mode range that comfortably covers 12 V and 24 V industrial buses, a 350 kHz small-signal bandwidth for fast transient response, low offset, and a propagation delay on the comparator output suitable for sub-microsecond overcurrent reaction. The amplifier supports a fixed gain (variant A1 = 20 V/V) that sets the conversion from shunt voltage to output voltage. The internal 1.2V comparator reference and open-drain ALERT output allow direct wire-OR with other system flags. The 8-pin WSON (DSG) 2x2 mm package is 24-pin, leadless, and surface-mountable, suiting dense PCB layouts. The INA381 uses a chopper-stabilized input stage and a bipolar process technology that deliver low input offset voltage and a low quiescent current. Designers can route the high-side shunt to the inputs while the comparator simultaneously watches the output against the 1.2V threshold. This eliminates timing skew between the analog measurement path and the digital protection path - a common source of nuisance tripping in discrete implementations. Typical applications include motor-drive overcurrent protection, solenoid and valve current monitoring, battery-pack current monitoring, hot-swap / eFuse circuits, USB and power-distribution load switches, and industrial 24V field-side monitoring. Compared with discrete op-amp + comparator designs, the INA381 reduces board area, BOM count, and propagation-delay variability between the measurement and the protection paths. When designing with this device, choose the shunt value so the full-scale shunt voltage is comfortably below the input common-mode and linear range, and set the comparator threshold via a resistor divider on the 1.2V reference pin. Place a 0.1 uF supply bypass capacitor close to the VDD pin to keep the chopper clock away from sensitive traces. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
ISPPAC-POWR1014-01TN48I - 14-Output Power Manager II | Lattice
The Lattice Semiconductor ISPPAC-POWR1014-01TN48I is a general-purpose in-system programmable power supply monitor, reset generator, and sequencing controller in a 48-pin TQFP (7x7) package. It integrates both programmable logic and programmable analog functions implemented in non-volatile E2CMOS technology, providing 14 open-drain digital outputs that can directly control DC-DC converters, low-dropout regulators (LDOs), and optocouplers. The operating voltage range covers 2.8V to 3.96V, suiting 3.3V system rails. A power supply monitor and sequencer (also called a power manager) is a specialized supervisory IC that sits between a system's power rails and the rest of the electronics, observing undervoltage, overvoltage, and timing conditions, then driving enable signals in a defined sequence. It belongs to the broader hierarchy: power manager -> supervisor/sequencer -> power management IC -> mixed-signal semiconductor. Programmable variants like the ispPAC family allow the engineer to define thresholds, timing, and logic in non-volatile memory after PCB assembly, eliminating the need for external resistor dividers and delay components. Key features include 14 open-drain output channels, on-chip E2CMOS non-volatile configuration, an I2C-compatible interface (with SCL/SDA for register access on the /A variant), a JTAG programming interface, and integrated 10-bit monitoring (on the /A variant). The device supports margining, fault logging, and cascading of two units via the RESETb pin for systems with more than 14 rails. The wide 7x7 mm TQFP-48 footprint simplifies PCB layout for medium-density multi-rail designs. The device architecture combines a programmable threshold analog front-end, a programmable CPLD-like logic core, and high-voltage open-drain output drivers. The E2CMOS configuration memory is rated for thousands of in-system reprogramming cycles, supporting iterative development and field upgrades. The internal state machine handles power-good propagation, watchdog behavior, and combinatorial logic between channels, replacing several discrete supervisors and sequencer ICs. Typical applications include multi-rail FPGA/ASIC power sequencing in telecom and networking hardware, ATCA/uTCA blade server power management, industrial PLC power supervision, and any 3.3V system requiring programmable fault response. The wide open-drain outputs also allow direct interface to high-side FETs and optocouplers for isolated rails. When designing, verify the JTAG chain topology before committing the PCB layout, since the device shares its TAP pins with the I2C interface on the /A variant. Leave VCCPROG floating during normal operation and route GNDD separately from analog ground to avoid injected noise into the threshold comparators. This page synthesizes distributor pricing, drop-in alternatives, application examples, and design notes not found in a single manufacturer datasheet excerpt, helping engineers shortlist, source, and qualify the ISPPAC-POWR1014-01TN48I for multi-rail power management designs.
LM74700-Q1 - 65V AEC-Q100 Ideal Diode Controller | TI
The Texas Instruments LM74700-Q1 is an automotive AEC-Q100 qualified ideal diode controller that operates with an external N-channel MOSFET as an ideal diode rectifier for low-loss reverse battery polarity protection, achieving a regulated forward voltage drop of only 20 mV in a 6-pin SOT-23 (DBV) package. An ideal diode controller is a power management IC that drives a MOSFET to emulate a diode with near-zero conduction loss. Instead of dissipating P = I x Vf watts in a Schottky diode (typically 0.4-0.7 V of forward drop), the controller servos the MOSFET gate to regulate the forward drop at roughly 20 mV, cutting conduction losses by more than an order of magnitude in battery-feed paths. Ideal diode controllers sit within the broader hierarchy of power-path protection ICs, alongside ORing controllers, hot-swap controllers, and reverse-polarity protection devices. Key features include a wide supply input range of 3.2 V to 65 V, an ultra-low operating quiescent current of 80 uA, and a shutdown current of approximately 1 uA when the enable pin is pulled low. The 65 V rating simplifies compliance with automotive ISO 7637 load-dump and transient requirements, while the 3.2 V floor supports severe cold-crank conditions in 12 V automotive battery systems. The controller integrates a charge pump that provides gate drive for the external N-channel MOSFET, allowing fast turn-on and low on-resistance operation. Internal regulation loop control holds the anode-to-cathode forward drop at 20 mV, emulating an ideal rectifier for ORing and reverse-battery blocking. Because the MOSFET conducts in either direction when enhanced, the controller must be placed appropriately for blocking topologies as described in the manufacturer datasheet. Typical applications include automotive reverse battery protection for ECUs and body electronics modules, N+1 redundant power supply ORing, industrial 24 V and 48 V rail protection, and cold-crank-tolerant front-end protection for infotainment and ADAS systems. A key design consideration: the enable pin allows the controller to be fully disabled, drawing roughly 1 uA, which is valuable in always-connected automotive systems where quiescent drain is tightly budgeted. This page synthesizes verified datasheet parameters, distributor listings, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
LS2406ERQ23 - 24V/6A eFuse with True RCB & Fast Role Swap
The Littelfuse LS2406ERQ23 is an advanced 28 V, 6 A rated electronic fuse (eFuse) protection IC that integrates a 24 mΩ ultra-low RDS(ON) power switch with comprehensive fault management in a compact 16-pin QFN (2.5 × 3.2 mm) package. It delivers current-limit, short-circuit, input-voltage surge, excessive inrush, over-temperature, and all-time reverse-current blocking protections to the system downstream of the switch, regardless of the EN logic state. An eFuse (semiconductor-based protection IC) is a solid-state replacement for traditional fuses and PTC resettable devices. It sits between a system power rail and its downstream load, monitoring current, voltage, and temperature and disconnecting the path when an abnormal condition is detected. eFuses belong to the broader hierarchy of power-path protection -> hot-swap controllers / load switches -> power-management ICs, and are preferred over fuses because they offer programmable thresholds, fast re-insertion, and telemetry flags for the host MCU. Key features of the LS2406ERQ23 include an adjustable current limit up to 6 A set by an external resistor, true reverse-current blocking (RCB), a fast role swap (FRS) function compatible with the USB Power Delivery Specification timing, thermal fold-back, and over-temperature shutdown. The 24 mΩ on-resistance minimises I²R conduction loss during normal operation, improving efficiency in battery-powered and adapter-powered designs. The device uses a low-side N-channel pass-FET topology with an integrated charge pump, allowing it to block current in both forward and reverse directions. Its programmable soft-start and inrush-current limiting protect upstream sources from load-step transients, and the FLAG/PGOOD pin provides real-time fault telemetry. The 16-QFN package offers a low thermal resistance path, suitable for 6 A continuous operation with adequate PCB copper. Typical applications include USB Type-C / USB PD source and sink ports, notebook and tablet charging subsystems, hot-swap bay protection in industrial PCs, multi-port wall adapters, and any 5 V to 20 V rail that must survive hot-plug events and unexpected reverse-current injection. When designing with the LS2406ERQ23, size the input and output capacitors per the datasheet to suppress transient ringing during fast role-swap events. Ensure sufficient copper area beneath the exposed pad to keep junction temperature below the thermal fold-back threshold at worst-case VIN and IOUT. This page synthesizes distributor pricing, same-brand and cross-brand drop-in alternatives, and practical PCB-layout design notes that go beyond the manufacturer datasheet, helping engineers shortlist a validated protection IC for USB PD and hot-swap designs.
LTC2924IGN#TRPBF - Quad Power Supply Sequencer SSOP-16 | Analog Devices
The Analog Devices LTC2924IGN#TRPBF is a quad power supply sequencer in a 16-lead SSOP (GN) package designed for use with external N-channel MOSFETs or power supplies with shutdown pins. It sequences and monitors up to four supplies (six with minimal external circuitry) and is cascadable for additional rails, with configurable turn-off order (reverse order or simultaneous). A power supply sequencer is a power management IC that controls the turn-on and turn-off sequence of multiple DC rails in a system. Sequencers sit in the hierarchy: power management IC (PMIC) > supervisor/sequencer > sequencer. They are essential in multi-rail systems (FPGAs, DSPs, SoCs, ADCs) that require controlled rail-to-rail timing to prevent latch-up, inrush damage, or incorrect bias during startup. By enforcing a deterministic order, sequencers protect downstream devices and simplify firmware coordination. Key features include a charge pump that drives external N-channel MOSFET gates, built-in fault monitoring with FAULT output, programmable ramp delay via a single resistor, and a wide supply voltage range. The 16-SSOP (GN) package is a surface-mount narrow-body outline with a thermal pad for improved dissipation, well suited to compact multi-rail boards. The LTC2924 uses a precision comparator-based architecture with internal bandgap references. Each sequenced rail is monitored via two feedback resistors, allowing the sequencer to detect when a rail is within regulation and advance to the next. The cascadable design supports larger systems by daisy-chaining multiple LTC2924 devices. Typical applications include FPGA/DSP/ASIC power sequencing, multi-rail telecom cards, network switches, industrial controllers, and medical imaging boards. The wide input range and MOSFET gate drive make it suitable for 1V to 25V rails with sub-millisecond timing control. When designing with this device, ensure each rail's feedback divider is sized for the rail voltage (two resistors per rail). Use the recommended bypass capacitors near VCC and at each GATE output. PCB layout should keep feedback traces short and away from switching nodes to avoid false trip events. This page synthesizes distributor pricing, drop-in alternatives, and practical sequencing design notes not consolidated in the manufacturer datasheet alone.
LTC2928CUHF - 4-Channel Power Supply Sequencer & Supervisor | ADI
The Analog Devices LTC2928CUHF is a four-channel cascadable power supply sequencer and high-accuracy supervisor housed in a 38-lead QFN (5x7 mm) package, designed to control power-up and power-down sequencing across multiple rails without firmware changes. It features four configurable monitor inputs, individual channel enable outputs, a master CASC pin for stacking unlimited sequencers, and a 1.5% accurate threshold reference, supporting turn-on/turn-off sequencing for systems with 2.5V to 6V rails. A power supply sequencer and supervisor is a mixed-signal IC that controls the order and timing in which multiple voltage rails are enabled during system power-up and disabled during power-down, while continuously monitoring each rail for under-voltage and over-voltage conditions. The LTC2928CUHF sits within the broader category hierarchy of supervisor IC -> voltage monitor -> power management IC -> semiconductor. Cascadable sequencers are essential building blocks in any multi-rail system where inrush current, latch-up, or DSP/FPGA/processor rail-ordering requirements preclude simultaneous rail activation. Key features include four independent sequencer channels with adjustable thresholds, a single-wire cascade interface for expanding beyond four rails, programmable ramp and fault timing via external capacitors, and integrated over-voltage and under-voltage comparators with 1.5% accuracy. Each channel has a dedicated ON/OFF control line, and a FAULT pin aggregates fault events across channels. The device operates from 2.5V to 6V on VCC and supports monitoring of supplies up to 6V directly (higher voltages require external dividers). The LTC2928 architecture uses an external timing capacitor per channel to program turn-on delay, turn-off delay, and fault-retry timing. The master CASC pin synchronizes multiple LTC2928 devices so that an unlimited number of power rails can be sequenced. Per-channel TIMER and SENSE pins interface to the supply being monitored, and the open-drain ON outputs drive external FETs or enable pins of downstream regulators. Typical applications include multi-rail FPGA and DSP boards, ATCA/AdvancedTCA cards, telecom line cards, RAID storage controllers, and industrial controllers where multiple voltage domains must come up in a defined order. The device is also widely used in test and measurement chassis, network switches, and any hot-swap-friendly chassis requiring N+1 redundant power sequencing. When designing with the LTC2928CUHF, place each SENSE pin bypass capacitor close to the IC, keep the timing-capacitor traces short, and use the cascade line as a single net between LTC2928 CASC pins if multiple ICs are stacked. For supplies above 6V, add a resistor divider on SENSE so the divided voltage falls inside the 0.5V to 1.0V threshold window. The exposed pad (Pin 39 on the QFN) must be soldered to the ground plane for thermal and electrical performance. This page synthesizes distributor stock data, drop-in same-package alternatives, and practical design notes not collected on the manufacturer datasheet.
LTC2928CUHF#PBF - 4-Channel Power Sequencer & Supervisor | ADI
The LTC2928CUHF#PBF from Analog Devices is a four-channel cascadable power supply sequencer and high accuracy supervisor. It is designed to manage the power-up and power-down sequencing of multiple supply rails in complex electronic systems, ensuring that each rail turns on and off in a controlled order to prevent latch-up, excessive current draw, or damage to sensitive ICs. The device is housed in a 38-pin QFN package (5x7 mm) and operates over a wide supply voltage range, making it suitable for a variety of industrial, networking, and computing applications. A power supply sequencer is a specialized power management IC that controls the order and timing of multiple voltage rails during system startup and shutdown. It is a critical component in systems with multiple supply voltages, such as FPGAs, ASICs, processors, and mixed-signal boards, where improper sequencing can lead to functional failures or permanent damage. The LTC2928 integrates sequencing and supervision into a single device, reducing board space and component count compared to discrete solutions. Key features of the LTC2928 include the ability to sequence up to four supplies per device, with cascading capability to handle an unlimited number of supplies by connecting multiple LTC2928s together. Sequencing thresholds, order, and timing are configured with just a few external resistors and capacitors, eliminating the need for software or PC board layout changes during development. The device also provides high-accuracy supervision with over-voltage and fault indication, selectable system shutdown, and fault event reporting with diagnostics. Technically, the LTC2928 uses a resistor-programmable architecture to set the sequencing order and timing, with an internal precision reference for accurate threshold detection. It supports both positive and negative supply monitoring, and its cascading interface allows seamless expansion. The device operates from a single supply voltage, typically 3.3V or 5V, and includes an open-drain fault output for system-level monitoring. Typical applications include FPGA and ASIC power sequencing, server and storage systems, telecom and networking equipment, and industrial control systems. The LTC2928 is particularly suited for designs where multiple voltage rails must be sequenced reliably without software intervention, and where high accuracy supervision is required to protect downstream components. When designing with the LTC2928, it is important to properly set the sequencing thresholds and timing using external resistors and capacitors, and to ensure adequate decoupling on the supply pins. The device's cascading feature should be used for systems with more than four rails, and the fault output should be connected to a system controller for proper fault handling.
LTC2955ITS8-2 - Pushbutton On/Off Controller with Auto Turn-On | Analog Devices
The Analog Devices LTC2955ITS8-2 is a micropower pushbutton on/off controller that manages system power by generating a clean enable output from a supply monitor input and a debounced pushbutton input, housed in an 8-pin TSOT-23 (TS8) package. It operates across a 1.6 V to 36 V input voltage range, draws only 1.2 µA typical quiescent current, and provides a configurable pushbutton debounce timer and interrupt output. According to the Analog Devices datasheet, the LTC2955 family is recommended for new designs and starts at $3.03 per 1ku unit list price. A pushbutton on/off controller is a type of power management IC that sits between a mechanical pushbutton and the system's main regulator or load switch. It belongs to the supervisory and reset IC family within the broader category of power management ICs. These devices debounce the pushbutton, generate a clean logic-level enable signal, and provide graceful power-up/power-down sequencing in battery-powered and line-powered systems. The LTC2955 specifically adds an automatic turn-on mode for systems that must power up without a button press. Key features of the LTC2955ITS8-2 include a wide 1.6 V to 36 V operating range, 1.2 µA typical quiescent current, an open-drain INT (interrupt) output that signals a button press or low-voltage event, and a KILL (power kill) input that lets the host force shutdown. The TSOT-23-8 package is suitable for handheld and space-constrained designs, and the part is specified from -40 °C to +85 °C industrial temperature range. The "-2" suffix denotes the active-high enable output polarity variant of the LTC2955 family. Architecturally, the LTC2955 uses a precision bandgap reference, comparators, and a timer block to generate the debounce and turn-off delays. The user programs the debounce time via an external capacitor on the PB/INT pin, and the turn-off time via a capacitor on the tOFF pin. The wide VIN range lets the part interface directly with 1-cell lithium, 2-3 cell alkaline, or industrial 24 V rails without additional level shifting. Typical applications include handheld test instruments, portable medical devices, battery-powered IoT nodes, industrial HMI panels, and any system that needs a soft on/off button instead of a hard mechanical switch. The -2 variant is the right choice when the downstream regulator or load switch expects an active-high enable signal. When designing with the LTC2955ITS8-2, choose pull-up resistors sized for the system leakage budget and place the tOFF and tDEB capacitors close to the IC to avoid noise injection. The KILL pin should be tied to GND through a resistor if unused, and the INT pin requires a pull-up to the logic rail of the host processor. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet, organized for engineers who need to evaluate, source, and integrate the LTC2955ITS8-2 quickly.
LTC2955ITS8-2#TRPBF - Pushbutton On/Off Controller | Analog Devices
The Analog Devices LTC2955ITS8-2#TRPBF is a micropower pushbutton on/off controller that manages system power by generating a clean enable output from a supply monitor input and a debounced pushbutton input, housed in an 8-pin TSOT-23 (TS8) package with tape-and-reel packaging. It operates over a wide 1.5 V to 36 V input range, draws only 1.2 µA typical quiescent current, and provides an open-drain / active-high INT output that flags pushbutton events and low-supply conditions to the host processor. A supervisory circuit (also called a power supply controller or power management controller) is an IC that monitors and controls the power rails of an electronic system. Pushbutton on/off controllers form a sub-category used to replace mechanical power switches with a momentary pushbutton while offering clean, debounced, sequencing-aware enable signals. Within the broader power-management IC hierarchy, supervisory circuits sit alongside voltage regulators and supervisors/reset ICs, providing the human-machine interface between the user and the power tree. Key features of the LTC2955 include automatic turn-on (the -2 variant enables the system when KILL is asserted, while the -1 variant disables it), a user-configurable power-on reset / debounce timer, wide 1.5 V–36 V VIN tolerance, integrated pushbutton debounce, and a polarity-independent pushbutton interface. According to the manufacturer datasheet 2955fa, the device provides a clean enable output via an open-drain pin capable of driving an external P-FET or PNP transistor, plus an INT output that can wake or interrupt the system microcontroller. Typical applications include handheld instruments, portable medical devices, notebook and tablet power sequencing, automotive telematics boxes, and industrial handheld terminals. The wide VIN range (1.5 V–36 V) allows the LTC2955 to monitor 1-cell Li-Ion, 2-cell Li-Ion, 12 V lead-acid, and even 24 V industrial buses directly without additional level translation. When designing with this part, place the KILL pull-up and the enable gate pull-up as close as possible to the IC, and add a small RC on the PB pin if the mechanical switch has high bounce. The INT pin is open-drain and requires a pull-up resistor to the logic supply of the host. According to Analog Devices documentation, the -2 polarity means the system powers up automatically on KILL assertion, which is preferred for systems that must start without user input (such as always-on sensor nodes).
LTC2956IUD-1 - 36V Micropower Wake-Up Timer w/ Pushbutton | ADI
The Analog Devices LTC2956IUD-1 is a micropower, wide-input-voltage, configurable wake-up timer with pushbutton control, packaged in a 12-lead 3x3 mm QFN (UD) with exposed thermal pad. It operates from a 1.5V to 36V supply, draws only 800 nA quiescent current during normal operation, and drops to 300 nA in hardware shutdown, making it ideal for battery-powered duty-cycled systems. A wake-up timer IC is a low-power supervisor that periodically powers up a host system from deep sleep, holds the rail on for a defined awake interval, and then returns the system to sleep. Wake-up timers sit in the power management hierarchy alongside voltage supervisors and reset ICs, but unlike a one-shot reset supervisor they add a programmable periodic interval (1 ms to 39 days via an external resistor) and a pushbutton debounce/control interface that lets a human override the timer to force shutdown, turn-on, or reset. Key features of the LTC2956IUD-1 include a configurable wake-up period from milliseconds to 39 days set by a single resistor, an ONMAX capacitor that sets the maximum system-awake interval, an EN output that gates downstream rails, a /PBO pushbutton input with on-chip debounce, and a /KILL output that asserts on long-press shutdown. The /INT status output can wake an MCU from deep sleep. The -1 variant is the active-low reset polarity configuration. Internally the LTC2956 uses a low-power RC oscillator, precision current references, and micropower comparators to achieve its 800 nA Iq. A 1.5V to 36V input range allows direct connection to single-cell Li-Ion, multi-cell NiMH, 12V lead-acid, and 24V industrial rails without pre-regulation. The exposed-pad QFN-12 package keeps thermal resistance low so the IC can drive small DC-DC EN or P-channel MOSFET gates directly. Typical applications include battery-powered IoT sensor nodes that wake hourly to take a measurement, security cameras that capture an image on pushbutton, e-paper displays with daily refresh, GPS trackers on weekly duty cycle, remote controls, and any ultra-low-power MCU system requiring both pushbutton on/off and scheduled periodic wake. The 39-day upper bound makes it useful for long-interval telemetry. When designing with the LTC2956IUD-1, choose RWAKE for the desired wake interval, CMAX for the maximum awake window, and tie /PBO to a tactile switch to ground. Add a 100 nF decoupling cap close to VIN and route the exposed pad to a copper pour. The /KILL output requires a 1 MΩ pull-up to VIN. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not aggregated in the manufacturer datasheet.
LTC2974IUP - 4-Ch PMBus Power System Manager | Analog Devices
The Analog Devices LTC2974IUP is a 4-channel Power System Manager that sequences, trims (servo), margins, supervises, manages faults, provides telemetry, and creates fault logs in a 64-lead (9mm × 9mm) plastic QFN package. It operates over an industrial temperature range of -40°C to 105°C and provides PMBus-compliant digital control of point-of-load supplies with EEPROM for non-volatile configuration. A Power System Manager is a class of mixed-signal supervisor IC that combines analog monitoring (voltage, current, temperature) with a digital control engine implementing PMBus commands. The LTC2974 occupies the role of digital supervisor between an FPGA/processor and its multiple POL rails, allowing precise voltage margining, sequencing, and fault logging. Within the broader hierarchy it sits at: power system manager -> digital supervisor -> power management IC -> mixed-signal semiconductor. Key features include four differential ±0.25% accurate 16-bit ADCs for rail voltage and current readback, four 10-bit DAC-controlled servo loops for closed-loop voltage trimming, four programmable fault thresholds, on-chip 256-byte user-EEPROM, integrated temperature sensor, and full PMBus 1.1/SMBus 2.0 interface support. The four closed-loop servos enable trim accuracy far beyond what external resistor dividers can deliver, while the per-rail fault log captures telemetry from black-box style fault events. The architecture integrates an analog front-end with a digital core that runs an internal state machine. The device accepts commands over PMBus to set output voltage, readback V/I/T, assert sequencing events, and log faults. The EEPROM stores the configuration profile, including sequencing order, trim targets, and fault thresholds, allowing standalone operation without host intervention after power-up. A dedicated SHARE_CLK pin supports multi-device synchronization for systems managing more than four rails. Typical applications include sequence-and-margin control for FPGA/ASIC multi-rail designs, ATCA/uTCA AdvancedMC cards, multicore processor boards (DSP/FPGA/ASIC), industrial servers, and high-availability telecom blades. The EEPROM-backed fault log is particularly useful in unattended telecom and storage systems where power-related events must be diagnosed post-mortem. Designers should plan for an external I²C pull-up and respect the QFN exposed-pad thermal and ground connection. Sequencing, trim, and fault behavior are fully programmable through PMBus commands using ADI's LTpowerPlay GUI, simplifying bring-up. For systems beyond four rails, multiple LTC2974s can be cascaded with the SHARE_CLK pin. This page synthesizes distributor pricing, parametric comparison tables, and design notes that go beyond the manufacturer datasheet to help engineers select, source, and implement the LTC2974 in multi-rail power systems.
LTC2974IUP#PBF - 4-Ch PMBus Power System Manager, 64-QFN
The Analog Devices LTC2974IUP#PBF is a 4-channel PMBus-compliant Power System Manager that sequences, trims, margins, supervises, manages faults, logs events, and provides telemetry, housed in a 64-lead 9 mm x 9 mm plastic QFN package. Headline capabilities include digital point-of-load voltage adjustment with 0.5% servo accuracy over temperature, integrated fault logging with black-box EEPROM, and 256 bytes of user-configurable EEPROM with CRC protection. The I2C/SMBus interface accepts the full PMBus command set for sequencing, margining, and telemetry readout. What is a Power System Manager? A power system manager is a digital supervisory IC that sits between a host processor and multiple point-of-load (POL) converters, replacing discrete analog sequencers, supervisors, and margining circuitry with one configurable device. Compared to discrete supervisors, a PSM stores trim coefficients, fault logs, and sequencing rules in non-volatile memory and lets engineers reconfigure rails via PMBus commands without board rework. PSMs occupy the tier above supervisor ICs in the power-management hierarchy: supervisor IC -> sequencer/monitor -> power system manager -> digital power platform. Key features of the LTC2974IUP#PBF include 4 independent channels, 0.5% output voltage servo accuracy across -40 C to +105 C, integrated temperature sensing, on-board 12-bit ADC for VIN/VOUT readback, and time-stamped fault logging. The device accepts a 4.5 V to 15 V supply and presents 3.3 V/5 V tolerant digital I/O, simplifying interfacing with FPGAs, ASICs, and baseboard controllers. The architecture combines a precision 12-bit ADC, four 10-bit DACs for trim servo, an EEPROM controller with CRC, and an SMBus slave. A built-in sequencer state machine implements rail-on/rail-off dependencies, while the supervisor block continuously monitors under-voltage, over-voltage, and over-temperature thresholds with programmable response times. Typical applications include high-density FPGA/ASIC multi-rail power platforms, telecom and networking line cards, ATCA/uTCA AdvancedMC boards, and industrial servers where deterministic sequencing, accurate margining, and post-mortem fault logs are mandatory. The 64-QFN package is suitable for reflow assembly with MSL3 floor life. When designing with this IC, allocate one I2C address per board by using the four ADDR pins and review the LTpowerPlay configuration toolchain. Place the device close to the POL converters it supervises to minimize analog trace noise coupling into the VOUT sense lines. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone.