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Analog Devices Inc. ADP3181JRUZ-REEL
- Part No.:
- ADP3181JRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3181JRUZ-REEL.pdf
- Description:
- 5 BIT OR 6 BIT PROGRAMMABLE 2, 3
- Quantity:
- Payment:
- Shipping:
Inventory:1,635,436
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Product details
Overview
ADP3181JRUZ-REEL from Analog Devices is a 5-bit/6-bit programmable 2-/3-/4-phase synchronous buck controller optimized for Intel VRM/VRD core power delivery. It features ±14.5 mV differential sensing error over temperature, logic-level PWM outputs for external high-power drivers, active current balancing across all phases, and supports both VRM 9 (5-bit) and VRD 10 (6-bit) VID codes via CPUID pin selection. It targets desktop PC power supplies for next-generation Intel processors.
For engineers reviewing the ADP3181JRUZ-REEL datasheet, ADP3181JRUZ-REEL pinout, ADP3181JRUZ-REEL application, or ADP3181JRUZ-REEL equivalent, key selection criteria include phase configurability (2/3/4), VID code compatibility (VRM9/VRD10), worst-case sensing accuracy (±14.5 mV), programmable short-circuit latch-off delay, and support for active voltage positioning with droop control.
Technical Context
The ADP3181JRUZ-REEL implements a multimode fixed-frequency PWM architecture with internal 6-bit DAC for direct processor VID decoding. Its phase count is determined dynamically by grounding PWM3/PWM4 pins, enabling 2-, 3-, or 4-phase operation without reconfiguration logic.
It integrates dual-path current sensing: CSSUM/CSCOMP for total output current (used in voltage positioning and current limit), and SW1–SW4 inputs for per-phase thermal balancing. The device uses differential FB/FBRTN sensing referenced to remote CPU sense points and supports programmable ramp slope via RAMPADJ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Phase Configurability | 2-, 3-, or 4-phase via PWM3/PWM4 pin grounding; no external logic required. |
| VID Code Support | 5-bit VRM 9 (CPUID > 4.5 V) or 6-bit VRD 10 (CPUID < 4.0 V); ADP3181JRUZ-REEL supports both. |
| Differential Sensing Error | ±14.5 mV worst-case over 0°C to +85°C - ensures tight regulation under thermal stress. |
| Current Limit Threshold | 105–145 mV (VCL) with 10.4 mV/μA setting ratio - enables precise, resistor-programmable overcurrent protection. |
| Power Good Window | −320 mV to +370 mV relative to DAC output - provides robust undervoltage/overvoltage monitoring for CPU rail stability. |
| Oscillator Frequency Range | 0.25–4 MHz master clock; per-phase frequency = fOSC/N (N = 2,3,4) - allows optimization of efficiency vs. VR size. |
| Soft Start Delay Time | 1 ms typical (RDELAY = 250 kΩ, CDELAY = 12 nF, VID = 011111) - ensures controlled inrush during CPU boot. |
Pinout & Package
ADP3181JRUZ-REEL is housed in a 28-lead TSSOP package (RoHS-compliant, lead-free, tape-and-reel). Pin count, layout, and thermal pad match JEDEC MO-153 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID4–VID0 (Pins 1–5) | Voltage ID DAC Inputs | Set output voltage via Intel VRM9/VRD10 code; pulled up internally - open = logic high. |
| CPUID (Pin 6) | VID Mode Selector | High (>4.5 V): enables 5-bit VRM9 mode; low (<4.0 V): enables 6-bit VRD10 mode and treats CPUID as VID5. |
| FB / FBRTN (Pins 8/7) | Differential Feedback Inputs | Enable remote sensing at CPU die; FBRTN carries only 100–140 μA - minimizes IR drop error. |
| PWM1–PWM4 (Pins 27–24) | Logic-Level Gate Drive Outputs | Drive external MOSFET drivers (e.g., ADP3110); grounded pins disable corresponding phases. |
| SW1–SW4 (Pins 23–20) | Per-Phase Current Balance Inputs | Monitor switch-node voltage for real-time thermal balancing; unused pins left open. |
| CSREF / CSSUM / CSCOMP (Pins 16/17/18) | Current Sense Interface | CSREF = reference node (tied to inductor common point); CSSUM = summing node; CSCOMP = compensation node for load-line gain/positioning. |
| RT / RAMPADJ / ILIMIT / DELAY (Pins 13/14/15/12) | Resistor-Programmable Functions | RT sets oscillator frequency; RAMPADJ sets PWM ramp slope; ILIMIT sets current limit threshold; DELAY sets soft start & latch-off delay. |
Key Features
| Feature | Design Value |
|---|---|
| Active Current Balancing | Independent per-phase SW-input monitoring + internal ramp feedback ensures <±5% current mismatch at steady state and dynamic thermal redistribution. |
| Programmable Voltage Positioning | Droop impedance set via CSCOMP-to-CSSUM feedback resistor - enables active load-line compliance with Intel VRM/VRD specs. |
| On-the-Fly VID Updates | Built-in PWRGD blanking and crowbar delay accommodates CPU-requested voltage changes without false fault triggering. |
| Dual VID Standard Support | Single hardware design supports both VRM 9 (desktop Pentium 4) and VRD 10 (Core 2 Duo) via CPUID pin - eliminates BOM variants. |
| Robust Short-Circuit Protection | Programmable latch-off delay (1.5 ms typical) prevents nuisance shutdowns during transient overloads while ensuring safe shutdown under sustained faults. |
Applications
| Desktop CPU Core Power Supply | VRM Module Design |
|---|---|
Use Scenario: Primary 12 V-to-core-voltage regulator on ATX motherboard for Intel Pentium 4 or Core 2 Duo processors. IC Role / Device Role / Timing Role: Multiphase synchronous buck controller managing up to four parallel buck stages with coordinated phase interleaving. Use Value: Delivers >100 A at sub-1.5 V with <±14.5 mV regulation error and active droop control - meets Intel VRM9/VRD10 spec margins. |
Use Scenario: Standalone voltage regulator module (VRM) used in server blade or embedded computing chassis. IC Role / Device Role / Timing Role: Central controller interfacing with CPU VID bus and driving discrete external MOSFET drivers (e.g., ADP3110). Use Value: Enables modular, scalable VRM designs with field-selectable 2-/3-/4-phase operation and programmable current limit - reduces qualification effort across platforms. |
| High-Performance Workstation PSU | Multi-Core Processor Power Delivery |
Use Scenario: Dual-CPU workstation board requiring independent, tightly regulated core rails for each socket. IC Role / Device Role / Timing Role: Phase-configurable controller supporting asymmetric loading across CPUs via per-phase current balancing and independent VID decoding. Use Value: Maintains <1% cross-regulation between rails using CSSUM-based current summation and SW-input thermal balancing - critical for SMP stability. |
Use Scenario: Mobile or embedded system with multi-core Intel CPU requiring dynamic voltage scaling (DVS) and rapid VID transitions. IC Role / Device Role / Timing Role: VID-responsive controller with crowbar blanking and delayed PWRGD to sustain operation during CPU P-state transitions. Use Value: Supports <250 μs VID code change response with no crowbar false triggers - enables aggressive power-state switching without reset events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322CRZ | 6-phase capable; integrated MOSFET drivers; no external driver requirement; 3.3 V bias supply needed. | Targets higher-current server CPUs (e.g., Xeon); lacks VRD10 mode - VRM9-only VID decoding. | Choose ISL6322CRZ when board space is constrained and integrated drivers reduce component count; verify VID table alignment with target CPU. |
| TPS51216RGET | 3-phase max; supports Intel IMVP-6/6.5; includes integrated bootstrap diodes; lower quiescent current (5 mA typical). | Designed for mobile ULV CPUs (e.g., Core i5 U-series); no VRM9 support - IMVP-6 only. | Choose TPS51216RGET for battery-powered or thermally limited designs where 3-phase suffices and IMVP-6 compliance is mandatory. |
Compared with ISL6322CRZ and TPS51216RGET, ADP3181JRUZ-REEL uniquely supports both VRM9 and VRD10 standards in one package, offers 4-phase flexibility without integrated drivers (enabling higher-efficiency discrete FET selection), and delivers tighter ±14.5 mV sensing accuracy over temperature - critical for desktop performance platforms.
Availability
ADP3181JRUZ-REEL is available at Aetrix Electronics and suitable for desktop PC power supplies, VRM modules, and high-performance workstation PSUs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ADP3181JRUZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADP3181JRUZ-REEL belongs to Analog Devices' CPU core power controller product line, designed specifically for Intel VRM/VRD-compliant multiphase buck regulation with emphasis on accuracy, configurability, and thermal robustness.
FAQ
What is the supported VID standard for ADP3181JRUZ-REEL?
ADP3181JRUZ-REEL supports both VRM 9 (5-bit) and VRD 10 (6-bit) VID standards. The CPUID pin selects the mode: >4.5 V enables VRM 9 decoding using VID4–VID0 only; <4.0 V enables VRD 10 decoding, treating CPUID as VID5. This dual-mode capability is confirmed in the ADP3181JRUZ-REEL datasheet Rev. A, Tables 4 and 5.
How does ADP3181JRUZ-REEL configure 2-phase vs. 3-phase operation?
ADP3181JRUZ-REEL detects phase count at startup by monitoring PWM3 and PWM4 pin voltages. Grounding PWM4 configures 3-phase operation; grounding both PWM3 and PWM4 configures 2-phase. PWM1 and PWM2 remain active in all configurations. This detection occurs during the first two oscillator cycles, and the 5 kΩ pull-down resistance on PWM pins ensures reliable recognition - details are in the "Start-Up Sequence" section of the ADP3181JRUZ-REEL datasheet.
What is the purpose of the RAMPADJ pin on ADP3181JRUZ-REEL?
The RAMPADJ pin on ADP3181JRUZ-REEL sets the slope of the internal PWM ramp generator. An external resistor from the converter's input voltage (e.g., 12 V) to RAMPADJ adjusts the ramp amplitude, directly influencing transient response speed and current-loop stability. The ADP3181JRUZ-REEL datasheet specifies RAMPADJ voltage range as −50 mV to +50 mV relative to FB and input current range of 0–100 μA - enabling precise feed-forward tuning.
Does ADP3181JRUZ-REEL integrate MOSFET drivers?
No, ADP3181JRUZ-REEL does not integrate MOSFET drivers. It provides logic-level PWM1–PWM4 outputs intended to interface with external gate drivers such as the ADP3110. This architecture allows designers to select discrete high-current MOSFETs and optimize thermal performance - a key distinction from integrated-driver controllers like the ISL6322CRZ. The ADP3181JRUZ-REEL datasheet explicitly states "Logic-level PWM outputs for interface to external high power drivers" in its FEATURES section.
What is the maximum operating junction temperature for ADP3181JRUZ-REEL?
The maximum operating junction temperature for ADP3181JRUZ-REEL is 125°C, as specified in the Absolute Maximum Ratings table (Page 6) of its datasheet Rev. A. The device is rated for commercial ambient operation from 0°C to +85°C, and its thermal impedance (θJA) is 100°C/W - meaning proper PCB copper area and thermal vias are required to maintain junction temperature within limits under full load.
ADP3181JRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Controller, Intel VRM9, VRM10
- Voltage - Input:
- 12V
- Number of Outputs:
- 4
- Voltage - Output:
- 0.7V ~ 3.1V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
ADP3181JRUZ-REEL FAQ
1.How can I place an order for ADP3181JRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3181JRUZ-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 ADP3181JRUZ-REEL reliable?
The price and inventory of ADP3181JRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3181JRUZ-REEL is usually 5 days.
3.What payment methods are accepted for ADP3181JRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3181JRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3181JRUZ-REEL?
ADP3181JRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3181JRUZ-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 ADP3181JRUZ-REEL?
For technical support, including ADP3181JRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3181JRUZ-REEL requirements.
6.How does Aetrix verify that ADP3181JRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADP3181JRUZ-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 ADP3181JRUZ-REEL meets industry standards.
7.What is the process for return or replacement of ADP3181JRUZ-REEL?
All ADP3181JRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADP3181JRUZ-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 ADP3181JRUZ-REEL part is unused and in its original packaging.
Return procedure for ADP3181JRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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