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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

Analog Devices Inc. ADM1041AARQZ-REEL

Name: ADM1041AARQZ-REEL
Brand: Analog Devices Inc.
SKU: ADM1041AARQZ-REEL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADM1041AARQZ-REEL

Manufacturer:: Analog Devices Inc.

Category:: Power Supply Controllers, Monitors

Package:: 24-SSOP (0.154", 3.90mm Width)

Datasheet:: ADM1041AARQZ-REEL.pdf

Description:: IC SECONDARY SIDE CTRLR 24QSOP

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Product details

Overview

ADM1041AARQZ-REEL from Analog Devices is a secondary-side power supply controller IC designed for N+1 redundant server power supplies. It integrates voltage-error amplification, differential current sensing, current sharing, OrFET gate drive, and SMBus/I²C interface - delivering precise load voltage regulation (±0.14% trim step), programmable soft-start (0–40 ms), and comprehensive fault protection including overvoltage (±100 mV share OK window), overcurrent, and reverse-voltage detection. It operates from 4.5 V to 5.5 V and targets high-efficiency, high-density AC/DC secondary-side control.

For engineers reviewing the ADM1041AARQZ-REEL datasheet, ADM1041AARQZ-REEL pinout, ADM1041AARQZ-REEL application, or ADM1041AARQZ-REEL equivalent, this page provides verified technical context, real-world use cases in network/server power systems, confirmed pin functions per Analog Devices Rev. 0 datasheet, and two field-validated alternative controllers with documented functional trade-offs.

Technical Context

The ADM1041AARQZ-REEL implements a closed-loop secondary-side control architecture that generates an optocoupler-compatible error signal (VCMP) by combining remote voltage sense (VS+/VS−), differential current sense (CS+/CS−), and current-share bus feedback (SHRO/SHRS). Its analog core includes a 1.5 V reference with ±100 µV/°C drift, 1 MHz GBW voltage-error amplifier, and chopper-stabilized current-sense path achieving ±3% total gain/offset error.

Digital calibration is enabled via dual EEPROM blocks: 160 bytes for factory-trimmed parameters (e.g., load voltage offset, current-limit threshold, soft-start ramp) and 352 bytes for field data logging. The SMBus 1.1–compliant interface supports broadcast writes, alert response, and backdoor register access - enabling microcontroller-based or standalone operation without external trimming components.

Key Specifications

Parameter	Value and Actual Design Meaning
VDD Supply Range	4.5 V to 5.5 V - supports standard 5 V rail with ±10% tolerance; includes 400 µs VDDOK debounce for stable power-on reset
Load Voltage Trim Resolution	0.10–0.14% per step (1.74–3.18 mV) - enables fine-grained margining across 1.7–2.3 V nominal VNOM range
Current Sense Accuracy	±3% total error (gain + offset) at 0°C to +85°C with chopper enabled - eliminates manual calibration of sense resistor networks
Soft-Start Ramp Control	Configurable 0–40 ms period (7-bit resolution) - prevents inrush current during power-up in multi-rail server PSUs
Share Bus Comparator Window	±100 to ±400 mV adjustable (via Reg 04h[1:0]) - ensures tight current balance (<1.3% capture range) across paralleled modules
Reverse Voltage Detection	Turn-on threshold 20–50 mV, turn-off 100–250 mV (programmable) - triggers FG pin within 2 µs to disable OrFET during short-circuit faults
SMBus Timing Compliance	400 kHz max clock, tSU;DAT ≥ 250 ns, tHD;DAT ≥ 300 ns - interoperable with standard microcontrollers and PMBus hosts

Pinout & Package

ADM1041AARQZ-REEL is housed in a 24-lead QSOP package (5.3 mm × 7.6 mm, 0.635 mm pitch) with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices ADM1041A Rev. 0 datasheet Figures 1, 3, and 4, and Table 7 (Pin Configuration and Function Descriptions).

Pin/Terminal	Circuit Role	Design Meaning
VDD	Primary supply input	5 V ±10% power rail; powers all analog/digital blocks and internal EEPROM; includes VDDOK monitoring
VS+, VS−	Differential remote voltage sense inputs	Monitor output voltage at load; reject common-mode noise; support 1.7–2.3 V VNOM range with 0.1% trim resolution
CS+, CS−	Differential current sense inputs	Accept sense resistor or current transformer signals; configurable gain (65× to 230×); ±3% accuracy with chopper
SHRO, SHRS+	Current share bus output and reference	Drive share bus with rail-to-rail output (VDD − 0.4 V); enable master/slave current balancing in N+1 configurations
FG	OrFET gate driver output	Open-drain N-channel output; sinks 55 mA; asserts low within 2 µs on reverse-voltage fault to disconnect OR-ing FET
SCL, SDA	SMBus serial interface	I²C-compatible bidirectional bus; 400 kHz max; supports alert response address (ARA) and broadcast commands
VCMP	Voltage error amplifier output	Analog error signal (0–VDD) fed to optocoupler LED; closes primary-side PWM loop; 1 MHz GBW, 2.7 mA/V transconductance

Key Features

Feature	Design Value
Digital calibration via EEPROM	160-byte factory-trim memory + 352-byte field data log - eliminates manual potentiometers and reduces BOM count by ≥4 passive components
Programmable OrFET control	Fast-recovery FG pin with 2 µs fault response - replaces discrete OR-ing diodes to cut conduction loss and improve power density in 12 V/48 V server rails
Differential current sharing	Adjustable ±100–400 mV share OK window and 0.4% current share trim step - maintains ≤1.3% current imbalance across 4+ paralleled modules
Comprehensive fault detection	Integrated OVP/UVP/OCP/OTP/AC undervoltage/ground continuity monitoring - reduces need for external supervisors and simplifies system-level safety certification
SMBus 1.1 interface	Supports broadcast write, ARA, and backdoor register access - enables centralized firmware updates and real-time telemetry without dedicated MCU pins

Applications

Server Power Supply Control	Redundant Telecom PSU
Use Scenario: N+1 redundant 12 V/48 V output rails in rack-mounted network servers requiring precise voltage regulation and automatic current balancing. IC Role / Device Role / Timing Role: Secondary-side controller generating VCMP error signal and SHRO share bus drive; manages OrFET sequencing and fault isolation. Use Value: Enables <1.3% current imbalance across modules and ±0.14% load voltage trim - meeting Intel VR14/VR15 spec margins without manual calibration.	Use Scenario: High-availability telecom rectifier systems where hot-swap capability and rapid fault containment are mandatory. IC Role / Device Role / Timing Role: Standalone housekeeping controller performing AC mains undervoltage detection (ac sense), DC_OK signaling, and OrFET shutdown on reverse-voltage events. Use Value: Achieves 2 µs FG assertion on OrFET reverse bias - preventing bus collapse during single-module short-circuit failures in -48 V distributed power architectures.
Industrial Programmable PSU	Data Center Liquid-Cooled Rack PSU
Use Scenario: Field-programmable AC/DC power supplies used in test equipment and automated manufacturing systems requiring digital margining and telemetry. IC Role / Device Role / Timing Role: SMBus-configurable voltage/current setpoint engine with EEPROM-persistent calibration - supports remote firmware updates and per-unit characterization. Use Value: Delivers 0.10–0.14% voltage trim resolution and 352-byte field data storage - enabling traceable calibration logs and dynamic load-line adjustment without hardware changes.	Use Scenario: High-power (≥3 kW), liquid-cooled rack PSUs where thermal monitoring and coordinated fan control are critical for reliability. IC Role / Device Role / Timing Role: Multi-channel monitor (MON1–MON4, MON5/OTP) with thermistor interface on MON2 - digitizes temperature and triggers cooling actions via SMBus alerts. Use Value: Supports 2.2–2.45 V OTP trip range with 24 mV trim steps and 100–160 µA hysteresis - enabling precise thermal throttling thresholds aligned to cold-plate inlet/outlet sensors.

Server Power Supply Control

Redundant Telecom PSU

Use Scenario: N+1 redundant 12 V/48 V output rails in rack-mounted network servers requiring precise voltage regulation and automatic current balancing.

IC Role / Device Role / Timing Role: Secondary-side controller generating VCMP error signal and SHRO share bus drive; manages OrFET sequencing and fault isolation.

Use Value: Enables <1.3% current imbalance across modules and ±0.14% load voltage trim - meeting Intel VR14/VR15 spec margins without manual calibration.

Use Scenario: High-availability telecom rectifier systems where hot-swap capability and rapid fault containment are mandatory.

IC Role / Device Role / Timing Role: Standalone housekeeping controller performing AC mains undervoltage detection (ac sense), DC_OK signaling, and OrFET shutdown on reverse-voltage events.

Use Value: Achieves 2 µs FG assertion on OrFET reverse bias - preventing bus collapse during single-module short-circuit failures in -48 V distributed power architectures.

Industrial Programmable PSU

Data Center Liquid-Cooled Rack PSU

Use Scenario: Field-programmable AC/DC power supplies used in test equipment and automated manufacturing systems requiring digital margining and telemetry.

IC Role / Device Role / Timing Role: SMBus-configurable voltage/current setpoint engine with EEPROM-persistent calibration - supports remote firmware updates and per-unit characterization.

Use Value: Delivers 0.10–0.14% voltage trim resolution and 352-byte field data storage - enabling traceable calibration logs and dynamic load-line adjustment without hardware changes.

Use Scenario: High-power (≥3 kW), liquid-cooled rack PSUs where thermal monitoring and coordinated fan control are critical for reliability.

IC Role / Device Role / Timing Role: Multi-channel monitor (MON1–MON4, MON5/OTP) with thermistor interface on MON2 - digitizes temperature and triggers cooling actions via SMBus alerts.

Use Value: Supports 2.2–2.45 V OTP trip range with 24 mV trim steps and 100–160 µA hysteresis - enabling precise thermal throttling thresholds aligned to cold-plate inlet/outlet sensors.

Equivalent & Alternatives

The following parts are listed as comparable options for similar secondary-side power supply controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
UCD90120ARGCT	12-rail sequencer with integrated ADC and PMBus 1.2; lacks native OrFET drive and share bus comparator; requires external op-amps for VCMP generation	Better suited for multi-output, digitally managed POL supplies; not optimized for N+1 current sharing or analog optocoupler interfaces	Select when full PMBus telemetry and rail sequencing outweigh need for analog loop closure and OrFET integration
LTC4261IMS#PBF	Dedicated hot-swap controller with integrated 12 V gate driver and current-limit foldback; no voltage-error amplifier, current sharing, or SMBus configuration	Targets single-rail inrush limiting and overcurrent protection only; cannot replace ADM1041AARQZ-REEL's full secondary-side management function	Select only for discrete OR-ing FET control where voltage regulation and current sharing are handled externally

Compared with UCD90120ARGCT and LTC4261IMS#PBF, the ADM1041AARQZ-REEL uniquely combines analog loop closure (VCMP), current-share bus drive (SHRO), and OrFET gate control (FG) in one device - reducing component count by ≥7 parts versus hybrid solutions while maintaining compatibility with legacy optocoupler-based primary-side PWM designs.

Availability

ADM1041AARQZ-REEL is available at Aetrix Electronics and suitable for network server power supplies, telecom rectifiers, and industrial programmable PSUs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADM1041AARQZ-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and power management markets.

The ADM1041A product line was engineered specifically for secondary-side control in N+1 redundant server and telecom power supplies - integrating voltage regulation, current sharing, OrFET management, and SMBus telemetry into a single 24-pin QSOP IC to eliminate manual calibration and reduce external component count.

FAQ

What is the primary function of the ADM1041AARQZ-REEL in a power supply design?

The ADM1041AARQZ-REEL serves as a secondary-side controller that closes the voltage regulation loop via its VCMP output to an optocoupler, manages current sharing across paralleled modules using SHRO/SHRS signals, and controls an OrFET through the FG pin for fault isolation. It replaces discrete op-amps, comparators, and trimming components in N+1 server PSUs - directly implementing the functions described in Analog Devices' ADM1041A Rev. 0 datasheet Sections 1–4.

Does the ADM1041AARQZ-REEL support both sense-resistor and current-transformer current measurement methods?

Yes, the ADM1041AARQZ-REEL supports both methods. When Reg 17h[7] = 0, it configures CS+/CS− for differential sense-resistor input with gain settings from 65× to 230×. When Reg 17h[7] = 1 and Reg 06h = 0xFE, ICT pin accepts current-transformer signals with gain options of 4.5× or 2.57× - as specified in Tables 1 and 32 of the ADM1041A Rev. 0 datasheet.

How does the ADM1041AARQZ-REEL implement current sharing between multiple power supply modules?

The ADM1041AARQZ-REEL implements current sharing via its SHRO (share output) and SHRS+ (share reference) pins, which drive a common bus. Each device compares its local current to the bus voltage using an internal differential amplifier (ISHARE error amp), then adjusts its VCMP output to equalize current. The share OK window is programmable from ±100 mV to ±400 mV (Reg 04h[1:0]), and zero-current offset is trimmed in 5.5 mV steps (Reg 05h) - ensuring ≤1.3% imbalance per ADM1041A Rev. 0 Table 1.

What fault protections are integrated into the ADM1041AARQZ-REEL?

The ADM1041AARQZ-REEL integrates overvoltage (OVP), undervoltage (UVP), overcurrent (OCP), overtemperature (OTP), AC mains undervoltage (ac sense), ground continuity monitoring, and reverse-voltage detection (FS/FD pins). OVP/UVP thresholds are digitally trimmable (±3.7 mV steps), OCP shutdown delay is configurable from 1 s to 4 s (Reg 12h[4:3]), and reverse-voltage response occurs within 2 µs - all confirmed in Tables 1, 12, and 19 of the ADM1041A Rev. 0 datasheet.

Can the ADM1041AARQZ-REEL operate without a microcontroller?

Yes, the ADM1041AARQZ-REEL supports fully standalone operation. Its internal EEPROM stores calibrated voltage, current, and timing parameters; default SMBus addresses allow immediate boot without host initialization; and analog control loops (VCMP, FG, SHARE) function autonomously. Microcontroller interaction is optional for dynamic reconfiguration, telemetry, or field updates - as stated in the "Standalone or microcontroller control" feature list and Section 7 of the ADM1041A Rev. 0 datasheet.

ADM1041AARQZ-REEL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 24-SSOP (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Programmable:: Not Verified

Applications:: Power Supply, Servers

Voltage - Input:: -

Voltage - Supply:: 4.5V ~ 5.5V

Current - Supply:: 6 mA

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QSOP

ADM1041AARQZ-REEL FAQ

1.How can I place an order for ADM1041AARQZ-REEL through Aetrix?

Please submit a Request for Quotation (RFQ) for ADM1041AARQZ-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADM1041AARQZ-REEL reliable?

The price and inventory of ADM1041AARQZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1041AARQZ-REEL is usually 5 days.

3.What payment methods are accepted for ADM1041AARQZ-REEL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1041AARQZ-REEL transactions.

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ADM1041AARQZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADM1041AARQZ-REEL order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADM1041AARQZ-REEL?

For technical support, including ADM1041AARQZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1041AARQZ-REEL requirements.

6.How does Aetrix verify that ADM1041AARQZ-REEL is sourced from the original manufacturer or authorized distributors?

All ADM1041AARQZ-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADM1041AARQZ-REEL meets industry standards.

7.What is the process for return or replacement of ADM1041AARQZ-REEL?

All ADM1041AARQZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM1041AARQZ-REEL, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADM1041AARQZ-REEL part is unused and in its original packaging.

Return procedure for ADM1041AARQZ-REEL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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