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Analog Devices Inc. ADP3166JRU-REEL7
- Part No.:
- ADP3166JRU-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3166JRU-REEL7.pdf
- Description:
- SYNCHRONOUS BUCK CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
ADP3166JRU-REEL7 from Analog Devices is a 5-bit programmable, 2-/3-/4-phase synchronous buck controller optimized for AMD processor core voltage regulation. It delivers 0.8 V to 1.55 V output with ±1% differential sensing error over temperature, supports up to 1 MHz per phase (via RT resistor), and provides logic-level PWM outputs for external high-power MOSFET drivers. It is used in desktop PC VRM modules powering next-generation AMD K8-class CPUs.
For engineers reviewing the ADP3166JRU-REEL7 datasheet, ADP3166JRU-REEL7 pinout, ADP3166JRU-REEL7 application, or ADP3166JRU-REEL7 equivalent, key selection criteria include phase configurability (2/3/4), VID-programmable output voltage range, active current balancing, programmable short-circuit latch-off delay, and crowbar overvoltage protection with 400 ns response.
Technical Context
The ADP3166JRU-REEL7 implements a multimode fixed-frequency PWM architecture with internal 5-bit VID DAC compliant with AMD Hammer-family specifications. Its oscillator frequency (set via RT pin) is divided by the number of active phases - grounding PWM3/PWM4 selects 2-phase (÷2), grounding only PWM4 selects 3-phase (÷3), and all four PWM outputs active enable 4-phase (÷4) operation.
It integrates differential remote sensing (FB/FBRTN), a dedicated current sense amplifier (CSREF/CSSUM/CSCOMP) for load-line positioning and accurate total-current measurement, and independent protection circuits: programmable current limit with adjustable latch-off delay, power-good blanking during VID on-the-fly transitions, and crowbar logic that forces low-side MOSFETs on when output exceeds 2.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.8 V to 1.55 V, digitally set via 5-bit VID code; enables precise CPU core voltage compliance per AMD specification. |
| Phase Configuration | 2-, 3-, or 4-phase selectable via PWM3/PWM4 grounding; allows scalable current delivery (e.g., 56 A at 3-phase) with interleaved ripple cancellation. |
| Differential Sensing Accuracy | ±1% over 0°C to 85°C; achieved via precision reference, low-offset error amplifier, and FB/FBRTN remote sensing for stable regulation under thermal drift. |
| Switching Frequency per Phase | Up to 1 MHz; set by RT resistor (e.g., 200 kΩ → 990 kHz master clock → 330 kHz per phase in 3-phase mode) to balance efficiency vs. component size. |
| Current Balancing | Active balancing across all enabled phases using SW1–SW4 inputs; maintains thermal and current uniformity without external circuitry. |
| Protection Features | Programmable short-circuit latch-off delay (600 µs typical), crowbar output (2.0–2.2 V trip), and PWRGD blanking (100–250 µs) for safe VID on-the-fly transitions. |
| Package | TSSOP-28 (RU-28); surface-mount, thermally enhanced package suitable for high-density VRM layouts. |
Pinout & Package
ADP3166JRU-REEL7 is housed in a 28-lead TSSOP (RU-28) package with exposed pad for thermal dissipation. Pin numbering follows standard top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID4–VID0 (Pins 1–5) | Voltage Identification Inputs | 5-bit logic interface to CPU; open pins default to '1'; sets DAC output voltage (0.8–1.55 V) and triggers "No CPU" shutdown if all five are open. |
| PWM1–PWM4 (Pins 24–27) | Logic-Level PWM Outputs | Drive external gate drivers (e.g., ADP3418); grounding PWM4 enables 3-phase, grounding PWM3+PWM4 enables 2-phase operation. |
| SW1–SW4 (Pins 20–23) | Current Balance Inputs | Accept switch-node voltages; used to sum inductor currents for active phase balancing and load-line positioning. |
| CSREF, CSSUM, CSCOMP (Pins 16, 18, 17) | Current Sense Interface | CSREF = reference node (tied to inductor common point); CSSUM = summed current input; CSCOMP = compensation node for gain/slope tuning. |
| FB / FBRTN (Pins 8, 7) | Differential Feedback Inputs | Enable remote sensing: FB connects to CPU sense point via resistor; FBRTN connects to CPU sense ground; minimizes PCB trace IR errors. |
| ILIMIT (Pin 15) | Current Limit Threshold Input | Resistor-to-GND sets current limit threshold (10.4 mV/µA scaling); also signals driver ICs to disable outputs during shutdown. |
| CROWBAR (Pin 6) | Overvoltage Crowbar Output | Open-drain logic-high signal activates external crowbar circuit when CSREF > 2.1 V; protects CPU from destructive overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Configurable Multiphase Operation | Hardware-selectable 2-/3-/4-phase via PWM pin grounding - eliminates need for configuration registers or firmware, simplifying VRM design and validation. |
| Active Current Balancing | Real-time balancing across all active phases using SWx inputs - ensures equal current sharing and thermal distribution without external op-amps or DACs. |
| VID On-the-Fly Support | Blanking logic suppresses false PWRGD and DAC glitches during dynamic VID code changes - enables seamless CPU voltage scaling under load without system reset. |
| Programmable Short-Circuit Response | Latch-off delay set by external RC on DELAY pin (e.g., 600 µs with 250 kΩ + 4.7 nF) - allows controlled shutdown while permitting transient recovery if fault clears early. |
| Differential Remote Sensing | FB/FBRTN interface with 100 µA FBRTN bias current - maintains ±1% regulation accuracy despite PCB trace resistance and layout asymmetry. |
Applications
| Desktop PC VRM | AMD K8 Processor Power |
|---|---|
|
Use Scenario: Regulating 12 V input to dynamically adjustable core voltage (0.8–1.55 V) for AMD Athlon 64 and Opteron processors in ATX-compliant desktop motherboards. IC Role / Device Role / Timing Role: Primary multiphase buck controller managing up to four synchronous buck stages, coordinating phase timing and current sharing via SWx and PWMx signals. Use Value: Enables high-efficiency, low-noise, thermally balanced power delivery meeting AMD VRM 10.x specifications with minimal external components. |
Use Scenario: Providing tightly regulated, fast-transient-response core supply in server blade power modules supporting dual-socket AMD Opteron platforms. IC Role / Device Role / Timing Role: Synchronous buck controller implementing active voltage positioning (AVP) via CSCOMP-based droop control to maintain CPU voltage within ±50 mV under 24 A load steps. Use Value: Delivers <1.1 mΩ static droop resistance and <1.9 mΩ dynamic droop resistance - critical for maintaining CPU stability during burst workloads. |
| VRM Module Design | High-Current CPU Core Supply |
|
Use Scenario: Building modular, drop-in VRM solutions for OEM motherboard vendors requiring pre-validated, JEDEC-compliant power stages. IC Role / Device Role / Timing Role: Controller IC providing standardized VID interface, PWRGD signaling, and crowbar protection - enabling interoperability with industry-standard driver ICs (e.g., ADP3418). Use Value: Reduces time-to-market via reference designs and eliminates custom firmware development for phase management and protection sequencing. |
Use Scenario: Delivering >50 A continuous output current in compact form factor for embedded computing systems with space-constrained PCB layouts. IC Role / Device Role / Timing Role: Multiphase controller leveraging interleaved switching (330 kHz per phase) to reduce input/output ripple and minimize capacitor count and size. Use Value: Achieves >90% peak efficiency at 56 A with 12 V input, reducing thermal load and enabling fanless or low-noise cooling solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiphase buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL6322IRZ | 6-phase capable, integrated MOSFET drivers, requires external VID DAC; lacks crowbar output and has fixed 0.6 V minimum output. | Targeted at Intel VRM 11.x; not AMD VID-compliant out-of-box; requires additional level-shifting for 0.8 V start. | Choose ISL6322IRZ only when designing for Intel platforms or when integrated drivers eliminate need for external gate drivers. |
| TPS51220ARUKR | 3-phase only, no VID DAC - relies on external DAC or resistor ladder; lower max frequency (1.5 MHz total, not per phase); no crowbar logic. | Designed for mobile/embedded AMD platforms with lower current (<30 A); lacks desktop VRM-specific features like PWRGD blanking for VID OTF. | Choose TPS51220ARUKR for cost-sensitive, lower-power applications where full AMD desktop VRM compliance is not required. |
Compared with ISL6322IRZ and TPS51220ARUKR, ADP3166JRU-REEL7 uniquely combines native AMD VID DAC support, per-phase frequency scalability up to 1 MHz, hardware-configurable phase count, and dedicated crowbar protection - making it the only direct fit for high-performance desktop AMD K8 VRM designs requiring full specification compliance.
Availability
ADP3166JRU-REEL7 is available at Aetrix Electronics and suitable for desktop PC VRM modules, AMD processor power supplies, and high-current CPU core supply designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for ADP3166JRU-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with deep expertise in power management ICs for computing infrastructure.
The ADP3166JRU-REEL7 belongs to Analog Devices' VRM controller product line, engineered specifically for high-efficiency, multiphase DC/DC conversion in AMD processor platforms - emphasizing precision VID decoding, active current balancing, and robust system-level protection.
FAQ
What is the operating temperature range for the ADP3166JRU-REEL7?
The ADP3166JRU-REEL7 is specified for commercial operation from 0°C to +85°C ambient temperature. Its junction temperature must not exceed 125°C under normal operation. The device includes UVLO hysteresis (0.7–1.1 V) and thermal shutdown safeguards to maintain reliability across this range. All electrical parameters in the datasheet - including ±1% differential sensing accuracy and 600 µs latch-off delay - are guaranteed within this temperature window.
How does the ADP3166JRU-REEL7 configure 2-phase vs. 3-phase operation?
The ADP3166JRU-REEL7 detects phase count automatically: grounding PWM4 (Pin 27) disables Phase 4 and configures 3-phase operation; grounding both PWM3 (Pin 26) and PWM4 configures 2-phase. Internal comparators monitor each PWM pin voltage (threshold ~400 mV) during the first two oscillator cycles after enable. The ADP3166JRU-REEL7 then divides its master clock frequency (set by RT) by the detected number of phases to determine per-phase switching frequency.
Does the ADP3166JRU-REEL7 integrate MOSFET drivers, or does it require external drivers?
The ADP3166JRU-REEL7 does not integrate MOSFET drivers. It provides logic-level PWM1–PWM4 outputs designed explicitly to interface with external high-current gate drivers such as the ADP3418 or ADP3413. This architecture decouples control and power stages, allowing designers to select optimal drivers for thermal, current, and layout requirements - a key feature confirmed in the functional block diagram and pin descriptions for ADP3166JRU-REEL7.
What protection features are built into the ADP3166JRU-REEL7?
The ADP3166JRU-REEL7 includes short-circuit protection with programmable latch-off delay (set via DELAY pin RC network), overvoltage crowbar logic (trip at 2.0–2.2 V, reset at ~400 mV), power-good monitoring with blanking during VID changes, UVLO (6.5–7.3 V), and active current limiting via ILIMIT pin. These protections operate independently and concurrently - for example, crowbar activation forces PWM outputs low while asserting CROWBAR high, regardless of current limit state.
Can the ADP3166JRU-REEL7 support dynamic VID voltage changes during operation?
Yes, the ADP3166JRU-REEL7 supports VID on-the-fly (OTF) transitions. When any VID bit changes, internal logic blanks the DAC for ≥400 ns and blanks PWRGD for ≥100 µs to prevent false triggering. Each VID transition resets the blanking timer, enabling multi-step voltage slewing (e.g., 1.500 V → 1.350 V) while maintaining system stability - a capability explicitly verified in the General Description and Theory of Operation sections of the ADP3166JRU-REEL7 datasheet.
ADP3166JRU-REEL7 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, AMD
- Voltage - Input:
- 12V
- Number of Outputs:
- 4
- Voltage - Output:
- 0.8V ~ 1.55V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
ADP3166JRU-REEL7 FAQ
1.How can I place an order for ADP3166JRU-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3166JRU-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 ADP3166JRU-REEL7 reliable?
The price and inventory of ADP3166JRU-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3166JRU-REEL7 is usually 5 days.
3.What payment methods are accepted for ADP3166JRU-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3166JRU-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3166JRU-REEL7?
ADP3166JRU-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3166JRU-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 ADP3166JRU-REEL7?
For technical support, including ADP3166JRU-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3166JRU-REEL7 requirements.
6.How does Aetrix verify that ADP3166JRU-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADP3166JRU-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 ADP3166JRU-REEL7 meets industry standards.
7.What is the process for return or replacement of ADP3166JRU-REEL7?
All ADP3166JRU-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADP3166JRU-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 ADP3166JRU-REEL7 part is unused and in its original packaging.
Return procedure for ADP3166JRU-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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