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Analog Devices Inc. ADM1041ARQ-REEL7
- Part No.:
- ADM1041ARQ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Supply Controllers, Monitors
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ADM1041ARQ-REEL7.pdf
- Description:
- CONTROLLER WITH CURRENT SHARE
- Quantity:
- Payment:
- Shipping:
Inventory:445
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Product details
Overview
ADM1041ARQ-REEL7 from Analog Devices is a secondary-side controller IC for N+1 redundant server power supplies, providing voltage regulation, current sharing, OrFET control, and comprehensive fault detection including overvoltage, undervoltage, overcurrent, overtemperature, and reverse-voltage protection. It integrates a 2.5 V precision reference, SMBus/I²C interface, and 352-byte EEPROM for field calibration and configuration. Designed for high-efficiency AC/DC and DC/DC secondary-side management in network and web servers.
For engineers reviewing the ADM1041ARQ-REEL7 datasheet, ADM1041ARQ-REEL7 pinout, ADM1041ARQ-REEL7 application, or ADM1041ARQ-REEL7 equivalent, this page delivers verified technical context, real-world design meanings of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support details specific to OEM and industrial embedded development.
Technical Context
The ADM1041ARQ-REEL7 implements a closed-loop secondary-side control architecture that generates an optocoupler-compatible error signal (VCMP) by combining differential remote voltage sense (VS+/VS−), differential current sense (CS+/CS−), and current share bus feedback. Its analog front-end includes programmable gain amplifiers for current sensing (65× to 230×), digitally trimmed offset and tolerance compensation, and chopper-stabilized error amplifiers for low-drift performance.
Digital control is enabled via SMBus 1.1–compliant serial interface supporting broadcast writes, alert response, and EEPROM-based configuration storage (160-byte calibration + 192-byte field data). The IC supports both standalone operation and microcontroller coordination, with configurable logic polarity, debounce timing, and fault response delays across all monitored inputs (MON1–MON5, AC_OK, DC_OK, PSON).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDD Supply | 4.5 V to 5.5 V - powers all analog/digital blocks; UVLO start threshold at 4.3 V ensures clean power-up sequencing |
| 2.5 V Reference | 2.49–2.51 V ±100 ppm/°C - low-drift internal bandgap used for voltage error amplifier, current limit, and ADC references |
| Remote Voltage Sense | VNOM = 1.7–2.3 V differential range - enables precise load voltage regulation with 0.10–0.14% trim resolution via 8-bit register |
| Current Sense Gain | 65× to 230× programmable - selects optimal sensitivity for shunt resistor or current transformer inputs, minimizing gain error to ±2.5% |
| SMBus Interface | 400 kHz max clock, I²C-compatible - supports multi-drop addressing (ADD0 pin), broadcast commands, and EEPROM read/write without host intervention |
| OrFET Gate Drive | Open-drain N-channel FG output - drives external MOSFET gate to disconnect supply during reverse-voltage faults (<100 µs response) |
| Temperature Monitoring | MON2 input with 1.25 V threshold ±0.1 V hysteresis - interfaces directly to thermistor divider for fan control or shutdown at defined thermal thresholds |
Pinout & Package
ADM1041ARQ-REEL7 is housed in a 24-lead QSOP package (5.3 mm × 7.6 mm, 0.635 mm pitch) with exposed pad for thermal dissipation. Pin assignments are validated per Analog Devices Rev. A datasheet Figures 1, 14, and Table 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply rail | 5 V main power input; powers internal regulators, EEPROM, and all analog/digital circuitry |
| GND | Ground reference | Analog/digital common return; ground continuity monitoring detects open-GND faults |
| VS+, VS− | Differential remote voltage sense | Measures output voltage at load; rejects noise and IR drop in PCB traces |
| CS+, CS− | Differential current sense input | Accepts shunt voltage or CT secondary; supports programmable gain and offset trimming |
| SHRO, SHRS+ | Current share bus drive/receive | Drives shared bus for master/slave current balancing; differential input accepts bus voltage |
| FG | OrFET gate driver output | Open-drain N-channel output controlling external MOSFET; asserts low on reverse-voltage fault |
| SCL, SDA | SMBus serial interface | I²C-compatible bidirectional bus; supports multi-drop, alert response, and EEPROM programming |
| AC_OK, DC_OK | Power-good status outputs | Configurable open-drain/P-channel outputs indicating AC mains presence or regulated DC output stability |
| PSON | Power-on enable input | Active-low input enabling primary-side PWM; debounced (40–160 ms) to prevent false turn-on |
| MON2 | Thermal monitor input | Analog input for thermistor-based temperature sensing; triggers flag when voltage crosses 1.25 V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Digital calibration via EEPROM | 160-byte dedicated calibration memory stores gain/offset trims for voltage, current, and temperature channels - eliminates manual potentiometer adjustment and enables field recalibration |
| Comprehensive fault detection | Simultaneous monitoring of overvoltage (OVP), undervoltage (UVP), overcurrent (OCP), overtemperature (OTP), reverse voltage (FS/FD), and ground continuity - each with independent debounce and delay registers |
| OrFET control with fast shutdown | Reverse-voltage comparator triggers FG output within 100 µs to disable external MOSFET - prevents bus collapse in N+1 systems during rectifier or capacitor failure |
| Programmable soft-start slew rate | 7-bit adjustable ramp time (0–40 ms) controls VCMP rise to prevent inrush-induced instability - configured via Reg 10h[3:2] without external components |
| Differential load voltage sense | VS+/VS− inputs reject common-mode noise up to 2 V; 35 kΩ/500 kΩ input impedances minimize loading on high-impedance dividers |
| SMBus interface with backdoor access | Supports extended addressing and "backdoor" register access mode - enables firmware updates and diagnostics without interrupting normal SMBus traffic |
Applications
| Server Power Supply Control | N+1 Redundant DC Distribution |
|---|---|
Use Scenario: Dual 12 V/50 A outputs in a 2U rack-mount server PSU with hot-swap capability. IC Role / Device Role / Timing Role: Secondary-side controller generating optocoupler error signal (VCMP) and managing OrFET gate drive for fault isolation. Use Value: Enables precise 0.5% load regulation across 10–100% load range while maintaining <200 µs fault response to prevent single-point failure propagation. |
Use Scenario: Four parallel 48 V/20 A telecom rectifiers feeding a common DC bus in a central office power shelf. IC Role / Device Role / Timing Role: Current share master coordinating bus voltage and load balancing via SHRO/SHRS+ differential signaling. Use Value: Achieves ≤±1.5% current mismatch between units using programmable ISHARE slope and zero-offset trim - no external op-amps required. |
| High-Density AC/DC Adapter | Industrial Programmable Power Supply |
Use Scenario: 360 W medical-grade AC/DC adapter with active ORing and thermal derating. IC Role / Device Role / Timing Role: Housekeeping manager handling AC sense (AC_OK), DC OK status, thermistor monitoring (MON2), and soft-start sequencing. Use Value: Integrates 6 discrete monitoring functions into one IC - reduces BOM count by 12 components and PCB area by 35% vs. discrete solution. |
Use Scenario: 1 kW lab-grade power supply with digital setpoint control and fault logging. IC Role / Device Role / Timing Role: Calibration hub storing user-defined voltage/current limits and temperature thresholds in EEPROM for repeatable test conditions. Use Value: Field-updatable 352-byte EEPROM retains calibration data across power cycles and supports remote reconfiguration via SMBus - no hardware rework needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar secondary-side power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UCD90120ARGCT | 12-rail PMBus sequencer with integrated ADCs; lacks native OrFET control and differential current share bus | Better suited for multi-output POL supplies; requires external gate driver for ORing and separate current share IC | Select when managing >4 voltage rails with strict sequencing; avoid if OrFET integration or analog current share is required |
| LTC4261CGN#PBF | Hot-swap controller with integrated 12-bit ADC and I²C interface; no voltage regulation loop or current sharing capability | Focused on inrush limiting and overcurrent protection only; no VCMP generation or remote sense | Choose for simple hot-swap + telemetry where secondary-side regulation and redundancy management are handled externally |
Compared with UCD90120ARGCT and LTC4261CGN#PBF, the ADM1041ARQ-REEL7 uniquely combines closed-loop voltage regulation, analog current sharing, and OrFET gate drive in a single 24-pin QSOP - eliminating need for companion ICs in N+1 server PSU designs.
Availability
ADM1041ARQ-REEL7 is available at Aetrix Electronics and suitable for network servers, web servers, and redundant AC/DC power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for ADM1041ARQ-REEL7 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 industrial, automotive, communications, and computing markets since 1965.
The ADM1041 belongs to Analog Devices' Power Management & Monitoring product line, engineered specifically for secondary-side intelligence in high-reliability, N+1 redundant power systems - emphasizing integration, fault resilience, and field-programmable calibration.
FAQ
What is the primary function of the ADM1041ARQ-REEL7 in a power supply system?
The ADM1041ARQ-REEL7 serves as a secondary-side controller that manages output voltage regulation, current sharing among parallel modules, OrFET gate drive for fault isolation, and comprehensive housekeeping functions including overvoltage, undervoltage, overcurrent, and overtemperature protection. It generates the VCMP error signal sent to the primary-side PWM controller via optocoupler, enabling precise closed-loop control without manual calibration. This functionality is fully implemented in the ADM1041ARQ-REEL7 device.
Does the ADM1041ARQ-REEL7 support both shunt resistor and current transformer sensing?
Yes, the ADM1041ARQ-REEL7 supports both sensing methods via dedicated input configurations: CS+/CS− pins accept shunt-derived differential voltage with programmable gain (65× to 230×), while ICT pin accepts current transformer secondary output with two selectable gain settings (4.5× or 2.57×). The selection is controlled by Reg 17h[7] and Reg 17h[5], and both paths include digital offset and tolerance trimming. This dual-mode capability is built into the ADM1041ARQ-REEL7 silicon.
How does the ADM1041ARQ-REEL7 implement current sharing between parallel power supplies?
The ADM1041ARQ-REEL7 implements analog current sharing using a differential share bus (SHRO/SHRS+) with master-slave arbitration. Each unit measures its own output current and drives the shared bus voltage proportionally; the master adjusts its VCMP to equalize bus voltage across all units. The IC provides programmable ISHARE slope, zero-offset trim (Reg 05h), and share-ok window comparator thresholds (Reg 04h[1:0]) to achieve ≤±1.5% current mismatch. This architecture is intrinsic to the ADM1041ARQ-REEL7 design.
Can the ADM1041ARQ-REEL7 operate without a microcontroller?
Yes, the ADM1041ARQ-REEL7 supports fully standalone operation using factory-programmed EEPROM values for voltage setpoint, current limit, soft-start, and fault thresholds. All critical parameters - including VNOM trim, OVP/UVP levels, and current sense gain - are stored in nonvolatile memory and applied at power-up. The SMBus interface remains available for optional microcontroller supervision, but it is not required for basic regulation and protection functions in the ADM1041ARQ-REEL7.
What protection features does the ADM1041ARQ-REEL7 provide for OrFET circuits?
The ADM1041ARQ-REEL7 includes dedicated reverse-voltage detection on the CS− (FS) and FD pins to monitor for negative voltage across the OrFET during fault conditions. When reverse voltage exceeds programmable thresholds (100–250 mV turn-off, 20–50 mV turn-on), the FG output pulls low within 100 µs to disable the external MOSFET gate. This prevents bus collapse in N+1 systems and is a core safety feature of the ADM1041ARQ-REEL7, independent of SMBus communication.
ADM1041ARQ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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
ADM1041ARQ-REEL7 FAQ
1.How can I place an order for ADM1041ARQ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM1041ARQ-REEL7 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 ADM1041ARQ-REEL7 reliable?
The price and inventory of ADM1041ARQ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM1041ARQ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM1041ARQ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM1041ARQ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM1041ARQ-REEL7?
ADM1041ARQ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM1041ARQ-REEL7 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 ADM1041ARQ-REEL7?
For technical support, including ADM1041ARQ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM1041ARQ-REEL7 requirements.
6.How does Aetrix verify that ADM1041ARQ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM1041ARQ-REEL7 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 ADM1041ARQ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM1041ARQ-REEL7?
All ADM1041ARQ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM1041ARQ-REEL7, 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 ADM1041ARQ-REEL7 part is unused and in its original packaging.
Return procedure for ADM1041ARQ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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