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Analog Devices Inc. ADP3188JRUZ-REEL
- Part No.:
- ADP3188JRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Regulators
- Package:
- 28-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADP3188JRUZ-REEL.pdf
- Description:
- 6 BIT PROGRAMMABLE 2-/3-/4-PHASE
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADP3188JRUZ-REEL from Analog Devices is a 6-bit programmable, 2-/3-/4-phase synchronous buck controller optimized for Intel® VRM/VRD 10.x CPU core power delivery. It features ±9.5 mV worst-case differential sensing error over temperature, logic-level PWM outputs (0–5 V), active per-phase current balancing, and 0.8375 V to 1.6 V digitally programmable output voltage via VID interface - deployed in high-current desktop PC VRM modules.
For engineers reviewing the ADP3188JRUZ-REEL datasheet, ADP3188JRUZ-REEL pinout, ADP3188JRUZ-REEL application, or ADP3188JRUZ-REEL equivalent, key selection criteria include phase configurability (2/3/4), VID-based dynamic voltage scaling, differential remote sensing accuracy, programmable short-circuit latch-off delay, and compatibility with external high-power MOSFET drivers such as ADP3418.
Technical Context
The ADP3188JRUZ-REEL implements a multimode fixed-frequency PWM architecture with independent phase enable/disable via PWM3/PWM4 grounding, enabling selectable 2-, 3-, or 4-phase operation. Its internal 6-bit VID DAC directly interfaces Intel processors to set output voltage between 0.8375 V and 1.6 V referenced to FBRTN.
Current sensing uses a dedicated CSA with CSSUM/CSCOMP/CSREF inputs supporting DCR or resistor-based sensing; active current balancing operates across all enabled phases using SW1–SW4 inputs and internal ramp control. The controller supports on-the-fly VID changes with 400 ns transition delay and crowbar blanking during voltage transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 0.8375 V to 1.6 V, digitally set by 6-bit VID code - enables precise CPU core voltage tracking per VRM specification. |
| Differential Sensing Error | ±9.5 mV max over 0°C to 85°C - ensures stable regulation under thermal stress without calibration. |
| Phase Configuration | Selectable 2-, 3-, or 4-phase via PWM3/PWM4 pin grounding - allows scalable current handling (e.g., ~60 A typical in 4-phase). |
| Switching Frequency | Up to 1 MHz per phase (master clock up to 4 MHz, divided by phase count) - balances efficiency vs. VR size. |
| Current-Limit Threshold | Programmable 105–145 mV via ILIMIT resistor - sets accurate overcurrent trip point referenced to CSREF–CSCOMP. |
| Power Good Window | −300 mV UV / +200 mV OV relative to nominal DAC output - provides tight tolerance monitoring for CPU reset signaling. |
| Soft-Start Delay Time | 1 ms typical (RDELAY = 250 kΩ, CDELAY = 12 nF, VID = 011111) - controls inrush current during power-up. |
Pinout & Package
ADP3188JRUZ-REEL is housed in a 28-lead TSSOP package (JEDEC MO-153, 4.4 mm × 9.7 mm body, 0.65 mm pitch) with exposed pad for thermal dissipation. Pin 19 is GND; pin 28 is VCC; pins 24–27 are PWM1–PWM4 logic outputs; pins 20–23 are SW1–SW4 current-balance inputs; pins 1–6 are VID0–VID5 inputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VID0–VID5 | Voltage Identification Inputs | 6-bit parallel bus reading CPU VID code; open-circuit = logic high; determines DAC output voltage (0.8375–1.6 V). |
| FB / FBRTN | Differential Feedback Inputs | Remote sense pair: FB connects to CPU sense point via resistor; FBRTN ties to remote ground - enables accurate load-line positioning. |
| PWM1–PWM4 | Logic-Level PWM Outputs | 0–5 V push-pull outputs driving external gate drivers (e.g., ADP3418); grounding PWM3/PWM4 disables corresponding phases. |
| SW1–SW4 | Per-Phase Current-Balance Inputs | Monitor switch-node voltage of each buck stage; used for real-time thermal and current balancing across active phases. |
| ILIMIT | Current-Limit Setpoint | Resistor-to-GND sets 10.4 mV/µA scaling - defines CSREF–CSCOMP threshold for overcurrent detection and latch-off. |
| DELAY | Soft-Start & Latch-Off Timing | R+C network sets both soft-start ramp time and current-limit fault delay (e.g., 1.5 ms latch-off with 250 kΩ/12 nF). |
| RT | Oscillator Frequency Control | Resistor-to-GND sets master clock (0.25–4 MHz); actual phase frequency = master clock ÷ number of active phases. |
Key Features
| Feature | Design Value |
|---|---|
| 6-bit VID DAC integration | Direct interface to Intel VRM/VRD 10.x CPUs eliminates external DAC, reducing BOM count and layout complexity. |
| Active per-phase current balancing | Real-time SW-pin monitoring and internal ramp correction ensure ≤5% inter-phase current mismatch at full load. |
| Programmable short-circuit protection | Latch-off delay (1.5 ms typical) prevents nuisance tripping while ensuring safe shutdown during sustained overloads. |
| Differential remote sensing | ±9.5 mV sensing error over temp enables <1% output voltage deviation without trimming - critical for CPU stability. |
| On-the-fly VID code support | 400 ns VID-to-FB response enables dynamic voltage scaling during CPU P-state transitions without output disruption. |
Applications
| Desktop VRM Module | Intel CPU Core Power Supply |
|---|---|
|
Use Scenario: High-current, low-voltage power delivery for dual-core and quad-core Intel Pentium 4 and Core 2 processors in ATX desktop motherboards. IC Role / Device Role / Timing Role: Primary multiphase buck controller managing up to four synchronous buck stages, coordinating VID decoding, current balancing, and power-good signaling. Use Value: Enables compliance with Intel VRM 10.1 specifications including active voltage positioning, ±9.5 mV sensing accuracy, and <1 ms VID transition latency. |
Use Scenario: Core voltage regulation in OEM desktop systems requiring dynamic P-state switching and thermal-aware current distribution. IC Role / Device Role / Timing Role: Synchronous buck controller providing phase-interleaved PWM signals, real-time load-line adjustment, and crowbar-blanked power-good assertion during VID changes. Use Value: Delivers <60 A total output with <2% cross-regulation error and <100 µs transient recovery - meeting Intel's 200+ A/ns di/dt requirements. |
| High-Efficiency VRM Reference Design | Multi-Phase Server PSU Subsystem |
|
Use Scenario: Reference platform for motherboard vendors validating VRM layout, component selection, and thermal management under full CPU load. IC Role / Device Role / Timing Role: Programmable controller allowing rapid configuration of 2-/3-/4-phase topologies via jumper or firmware, with RAMPADJ-adjustable slope for optimal transient response. Use Value: Reduces design cycle time via proven layout guidelines, integrated current-sense amplifier, and no-load offset programming through FB resistor. |
Use Scenario: Secondary power rail generation in entry-level server PSUs where CPU core voltage must scale with workload without discrete PMIC overhead. IC Role / Device Role / Timing Role: Standalone multiphase controller interfacing directly with CPU VID bus and driving discrete MOSFETs - avoids proprietary PMIC lock-in. Use Value: Supports 12 V input-to-sub-1 V output conversion with >90% peak efficiency and <10 mV RMS output ripple due to 4-phase cancellation. |
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-T | 6-bit VID, 2-/3-/4-phase, but uses analog current-mode control vs. ADP3188JRUZ-REEL's multimode PWM; lower sensing accuracy (±15 mV). | Targeted at legacy VRM 9.x designs; lacks active impedance control mode and on-the-fly VID blanking. | Choose ISL6322IRZ-T only when migrating older VRM 9.x platforms with minimal layout change. |
| TPS51220ARUKR | 5-bit VID (0.7–1.7 V range), 2-/3-phase only, integrated MOSFET drivers - no external driver required unlike ADP3188JRUZ-REEL. | Designed for space-constrained notebooks; lacks SW-pin current balancing and programmable latch-off delay. | Choose TPS51220ARUKR for compact embedded systems where driver integration outweighs phase scalability needs. |
Compared with ISL6322IRZ-T and TPS51220ARUKR, ADP3188JRUZ-REEL offers superior differential sensing accuracy (±9.5 mV), full 4-phase support with per-phase SW monitoring, and dedicated active impedance control - making it the preferred choice for high-performance desktop VRMs requiring strict Intel VRM 10.1 compliance.
Availability
ADP3188JRUZ-REEL is available at Aetrix Electronics and suitable for desktop PC VRM modules, Intel CPU core power supplies, and high-efficiency multiphase reference designs requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for ADP3188JRUZ-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 industrial, automotive, communications, and computing markets since 1965.
The ADP3188JRUZ-REEL belongs to Analog Devices' VRM/VRD-compliant multiphase controller product line, engineered specifically for Intel processor core voltage regulation with emphasis on accuracy, phase flexibility, and transient robustness.
FAQ
What is the operating temperature range for ADP3188JRUZ-REEL?
The ADP3188JRUZ-REEL is specified for commercial operation from 0°C to 85°C ambient temperature. Its junction temperature must not exceed 125°C under normal operation, and thermal impedance (θJA) is rated at 100°C/W. The device includes UVLO hysteresis and internal biasing optimized for stability across this full range - critical for sustained CPU load conditions in unventilated desktop chassis.
How does ADP3188JRUZ-REEL configure 2-phase vs. 4-phase operation?
ADP3188JRUZ-REEL detects phase count automatically during startup by monitoring PWM3 and PWM4 pin voltages. Grounding PWM4 configures 3-phase; grounding both PWM3 and PWM4 configures 2-phase; leaving both floating enables default 4-phase operation. Each PWM pin has ~5 kΩ pull-down resistance during detection, so external pull-downs must exceed 25 kΩ to avoid false disable - confirmed in ADP3188JRUZ-REEL's start-up sequence documentation.
Can ADP3188JRUZ-REEL drive MOSFETs directly?
No, ADP3188JRUZ-REEL does not drive MOSFETs directly. It provides logic-level PWM outputs (0–5 V) designed exclusively to interface with external high-current gate drivers such as the ADP3418. Its PWM outputs lack the current drive capability (>1 A peak) and level-shifting needed for direct high-side/low-side MOSFET control - a deliberate architectural choice to maximize flexibility and thermal separation in high-power VRM designs.
What is the purpose of the RAMPADJ pin on ADP3188JRUZ-REEL?
The RAMPADJ pin on ADP3188JRUZ-REEL sets the slope of the internal PWM ramp by connecting an external resistor from the 12 V input rail to this pin. This adjusts the current-loop gain and transient response characteristics - critical for optimizing stability with different inductor DCR values or thermistor compensation networks. The RAMPADJ input current range is 0–100 µA, and its voltage is regulated to ±50 mV around FB, per ADP3188JRUZ-REEL's oscillator and ramp control specifications.
Does ADP3188JRUZ-REEL support dynamic VID code changes during operation?
Yes, ADP3188JRUZ-REEL fully supports on-the-fly VID code changes with built-in crowbar blanking and power-good blanking. VID transition delay is guaranteed at 400 ns (VID code change to FB voltage change), and the power-good output remains asserted during the transition window. This enables seamless CPU P-state transitions without system reset - a requirement explicitly validated in Intel VRM 10.1 compliance testing for ADP3188JRUZ-REEL.
ADP3188JRUZ-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:
- Programmable
- Operating Temperature:
- 0°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TSSOP
ADP3188JRUZ-REEL FAQ
1.How can I place an order for ADP3188JRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADP3188JRUZ-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 ADP3188JRUZ-REEL reliable?
The price and inventory of ADP3188JRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3188JRUZ-REEL is usually 5 days.
3.What payment methods are accepted for ADP3188JRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3188JRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADP3188JRUZ-REEL?
ADP3188JRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADP3188JRUZ-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 ADP3188JRUZ-REEL?
For technical support, including ADP3188JRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3188JRUZ-REEL requirements.
6.How does Aetrix verify that ADP3188JRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADP3188JRUZ-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 ADP3188JRUZ-REEL meets industry standards.
7.What is the process for return or replacement of ADP3188JRUZ-REEL?
All ADP3188JRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADP3188JRUZ-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 ADP3188JRUZ-REEL part is unused and in its original packaging.
Return procedure for ADP3188JRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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