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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

Analog Devices Inc. ADP3198AJCPZ-RL-AD

Name: ADP3198AJCPZ-RL-AD
Brand: Analog Devices Inc.
SKU: ADP3198AJCPZ-RL-AD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ADP3198AJCPZ-RL-AD

Manufacturer:: Analog Devices Inc.

Category:: Special Purpose Regulators

Package:: 40-VFQFN Exposed Pad, CSP

Datasheet:: ADP3198AJCPZ-RL-AD.pdf

Description:: SWITCHING CONTROLLER, VOLTAGE-MO

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Product details

Overview

ADP3198AJCPZ-RL-AD from Analog Devices is an 8-bit programmable 2- to 4-phase synchronous buck controller optimized for Intel® processor core voltage regulation. It delivers ±7.7 mV differential sensing error over temperature, supports 0.5 V–1.6 V output via VID DAC, operates up to 1 MHz per phase, and features logic-level PWM outputs for external high-power drivers - used in desktop PC VRM modules.

For engineers reviewing the ADP3198AJCPZ-RL-AD datasheet, ADP3198AJCPZ-RL-AD pinout, ADP3198AJCPZ-RL-AD application, or ADP3198AJCPZ-RL-AD equivalent, key selection criteria include phase programmability (2/3/4), VR10.x/VR11 compliance, active current balancing, FEPWM flex mode for transient response, and thermal throttling support via TTSENSE/VRHOT/VRFAN.

Technical Context

The ADP3198AJCPZ-RL-AD implements a multimode PWM architecture with internal 8-bit VID DAC decoding Intel-compatible voltage identification codes. Its oscillator frequency is set by an external RT resistor (0.25–4 MHz master clock), then divided by active phase count (2/3/4) to determine per-phase switching frequency.

It integrates independent current-sense amplifier (CSA) with programmable gain, differential remote sensing (FB/FBRTN), active current balancing across SW1–SW4 inputs, and digitally adjustable load line positioning via LLSET. Thermal monitoring uses TTSENSE with dual thresholds for VRHOT and VRFAN open-drain outputs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage Range	0.5 V to 1.6 V, digitally set via 8-bit VID code per VR10.x/VR11 specs
Differential Sensing Error	±7.7 mV worst-case over 0°C–85°C, enabling tight remote-sense regulation accuracy
Phase Configuration	Selectable 2-, 3-, or 4-phase operation via PWM3/PWM4 pin strapping
Switching Frequency	Up to 1 MHz per phase (master clock up to 4 MHz, divided by active phases)
Current Balancing	Active per-phase current measurement via SW1–SW4 inputs with internal ramp compensation
Thermal Monitoring	Dual-threshold sensing via TTSENSE with programmable VRHOT (765–855 mV) and VRFAN (1.06–1.15 V)
Power-Good Delay	Programmable via DELAY pin capacitor; supports on-the-fly VID changes with blanking

Pinout & Package

ADP3198AJCPZ-RL-AD is housed in a 40-lead LFCSP package with exposed EPAD electrically connected to GND. The package supports thermal dissipation at θ_JA = 39°C/W and operates from 0°C to 85°C ambient.

Pin/Terminal	Circuit Role	Design Meaning
EN (Pin 1)	Enable input	Pulling low disables all PWM outputs and forces PWRGD low; includes 800–900 mV threshold with hysteresis
PWM1–PWM4 (Pins 27–30, 22–25)	Logic-level phase outputs	Drive external gate drivers (e.g., ADP3120A); phase count set by strapping PWM3/PWM4 to VCC
CSREF (Pin 15), CSSUM (Pin 16), CSCOMP (Pin 17)	Current sense interface	CSREF is reference node; CSSUM sums phase currents; CSCOMP sets CSA gain and positioning loop response
VID0–VID7 + VIDSEL (Pins 32–39, 40)	Voltage ID interface	8-bit parallel bus decoded as VR10.x (VIDSEL = GND) or VR11 (VIDSEL = VCC) for DAC output programming
TTSENSE (Pin 10), VRHOT (Pin 9), VRFAN (Pin 8)	Thermal monitoring	NTC thermistor connects to TTSENSE; VRHOT/VRFAN are open-drain outputs signaling thermal thresholds

Key Features

Feature	Design Value
Fast Enhanced PWM (FEPWM) Flex Mode	Enables rapid load transient response without requiring full-loop redesign or compensation changes
Digitally Programmable Load Line	LLSET pin allows precise droop impedance tuning (e.g., 0.5 mΩ–2 mΩ) to meet Intel VR11 dynamic voltage positioning requirements
Programmable Short-Circuit Protection	Latch-off delay set via CDELAY capacitor (8 ms typical), preventing nuisance trips during startup or transients
Built-in Shunt Regulator	Allows direct 12 V system supply connection via series resistor (340 Ω typical), eliminating need for external LDO
Active Phase Current Balancing	Compensates for MOSFET R_DS(on) and layout mismatches across phases using SW1–SW4 inputs and internal ramp adjustment

Applications

Desktop CPU Core VRM	Multi-Phase Server PSU
Use Scenario: Regulating core voltage for Intel® Core™ i7/i9 processors in ATX desktop motherboards with dynamic VID scaling. IC Role / Device Role / Timing Role: Primary multiphase buck controller managing up to four synchronous buck stages, coordinating phase interleaving and current sharing. Use Value: Enables ±7.7 mV output accuracy under full thermal range while supporting on-the-fly VID changes during turbo boost transitions.	Use Scenario: High-current core rail in dual-socket Xeon® server power delivery with thermal-aware throttling. IC Role / Device Role / Timing Role: 4-phase controller with TTSENSE-based thermal feedback, driving discrete MOSFETs via ADP3120A gate drivers. Use Value: VRHOT and VRFAN outputs trigger system-level thermal management before critical junction temperatures are reached.
Embedded Workstation PSU	High-Performance GPU Core Supply
Use Scenario: Compact workstation board requiring stable 0.85 V @ 120 A core rail with minimal BOM count. IC Role / Device Role / Timing Role: Configured as 3-phase controller (PWM4 tied to VCC) with DCR current sensing and integrated shunt regulator. Use Value: Eliminates external bias supply and reduces component count while maintaining <1% load-line deviation across 0–120 A.	Use Scenario: Reference design for NVIDIA® Ampere/A100 GPU core voltage with aggressive transient response needs. IC Role / Device Role / Timing Role: 4-phase controller operating in FEPWM flex mode, using CSCOMP/LLSET for adaptive droop control during frame rendering spikes. Use Value: Achieves sub-50 µs recovery from 80% load step without output overshoot beyond ±15 mV.

Desktop CPU Core VRM

Multi-Phase Server PSU

Use Scenario: Regulating core voltage for Intel® Core™ i7/i9 processors in ATX desktop motherboards with dynamic VID scaling.

IC Role / Device Role / Timing Role: Primary multiphase buck controller managing up to four synchronous buck stages, coordinating phase interleaving and current sharing.

Use Value: Enables ±7.7 mV output accuracy under full thermal range while supporting on-the-fly VID changes during turbo boost transitions.

Use Scenario: High-current core rail in dual-socket Xeon® server power delivery with thermal-aware throttling.

IC Role / Device Role / Timing Role: 4-phase controller with TTSENSE-based thermal feedback, driving discrete MOSFETs via ADP3120A gate drivers.

Use Value: VRHOT and VRFAN outputs trigger system-level thermal management before critical junction temperatures are reached.

Embedded Workstation PSU

High-Performance GPU Core Supply

Use Scenario: Compact workstation board requiring stable 0.85 V @ 120 A core rail with minimal BOM count.

IC Role / Device Role / Timing Role: Configured as 3-phase controller (PWM4 tied to VCC) with DCR current sensing and integrated shunt regulator.

Use Value: Eliminates external bias supply and reduces component count while maintaining <1% load-line deviation across 0–120 A.

Use Scenario: Reference design for NVIDIA® Ampere/A100 GPU core voltage with aggressive transient response needs.

IC Role / Device Role / Timing Role: 4-phase controller operating in FEPWM flex mode, using CSCOMP/LLSET for adaptive droop control during frame rendering spikes.

Use Value: Achieves sub-50 µs recovery from 80% load step without output overshoot beyond ±15 mV.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiphase buck controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ISL6322AIRZ-T	6-phase capable, supports up to 150 A; lacks integrated shunt regulator - requires external 5 V bias	Targeted at higher-current server VRMs; no native VR11 extended VID support	Choose when >4 phases or >130 A total current required; verify external bias supply availability
TPS53679RSLR	Single-chip 6-phase solution with integrated drivers; supports PMBus for telemetry; no TTSENSE/VRHOT analog outputs	Designed for digital power systems with telemetry and firmware update capability	Prefer when digital control, fault logging, or remote configuration are mandatory; not drop-in compatible

Compared with ISL6322AIRZ-T and TPS53679RSLR, the ADP3198AJCPZ-RL-AD offers native VR11/VR10.x VID decoding, integrated shunt regulator for simplified 12 V biasing, and dedicated analog thermal outputs - making it optimal for cost-sensitive, analog-controlled Intel desktop VRMs where phase count ≤4 suffices.

Availability

ADP3198AJCPZ-RL-AD is available at Aetrix Electronics and suitable for desktop PC VRMs, Intel processor power modules, and embedded workstation power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADP3198AJCPZ-RL-AD 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, and computing markets.

The ADP3198AJCPZ-RL-AD belongs to Analog Devices' CPU core power controller product line, engineered specifically for Intel VRM/VRD-compliant multiphase buck regulation with emphasis on accuracy, thermal robustness, and seamless VID integration.

FAQ

What is the operating temperature range specified for the ADP3198AJCPZ-RL-AD?

The ADP3198AJCPZ-RL-AD is specified over the extended commercial temperature range of 0°C to 85°C ambient. Its junction temperature must not exceed 125°C under normal operation, and thermal design must account for θ_JA = 39°C/W. The device includes thermal throttling via TTSENSE with programmable VRHOT and VRFAN thresholds to protect downstream components before reaching critical limits. This specification ensures reliable performance in densely packed desktop motherboard environments where airflow is constrained.

How does the ADP3198AJCPZ-RL-AD support both VR10.x and VR11 voltage identification standards?

The ADP3198AJCPZ-RL-AD supports both VR10.x and VR11 standards through the VIDSEL pin (Pin 40): when pulled low, it decodes VID0–VID7 as 7-bit VR10.x; when pulled high, it interprets the full 8-bit code as VR11. The internal 8-bit DAC generates the corresponding reference voltage between 0.5 V and 1.6 V, and the error amplifier compares this to FB/FBRTN feedback. This dual-mode capability allows one ADP3198AJCPZ-RL-AD design to serve multiple Intel processor generations without hardware change - confirmed in the General Description and Pin Function Descriptions sections of the Rev. 0 datasheet.

Can the ADP3198AJCPZ-RL-AD operate with only two active phases, and how is that configured?

Yes, the ADP3198AJCPZ-RL-AD can be configured for 2-phase operation by connecting both PWM3 (Pin 29) and PWM4 (Pin 27) to VCC. During startup's phase detection interval, the internal comparator recognizes these pins as high and disables those outputs, leaving PWM1 and PWM2 active. The master clock frequency is then divided by 2 to set per-phase switching frequency. This configuration is explicitly documented in the Phase Detection Sequence section and validated in Figure 7's start-up timing diagram - enabling flexible BOM optimization for mid-tier platforms where 4-phase complexity is unnecessary.

What external components are required to set the current-limit threshold on the ADP3198AJCPZ-RL-AD?

The current-limit threshold on the ADP3198AJCPZ-RL-AD is set by an external resistor (R_ILIMIT) connected from ILIMIT (Pin 11) to GND. With IIREF = 15 μA typical, a 121 kΩ resistor yields V_ILIMIT = 1.21 V, resulting in a current-limit threshold voltage (V_CL) of 100 mV (V_CL/V_ILIMIT = 82.6 mV/V). This value directly determines the CSCOMP-to-CSREF differential trip point. The datasheet Table 1 specifies R_ILIMIT tolerance impact on V_CL, and the Application Information section provides design equations for custom current-limit values - confirming resistor-based programming as the sole method for this function.

Does the ADP3198AJCPZ-RL-AD include protection against output overvoltage events, and how does it respond?

Yes, the ADP3198AJCPZ-RL-AD includes crowbar-based overvoltage protection. When FB exceeds the nominal DAC output by 100–200 mV (VCROWBAR), the crowbar circuit triggers within 100–250 µs (depending on VID activity), forcing all PWM outputs low. The crowbar reset occurs when FB falls below 320–430 mV relative to FBRTN. This fast, hardware-level response prevents damage to sensitive CPU cores during regulator faults. The crowbar function is independent of the PWRGD comparator and operates even if PWRGD is masked - a behavior verified in the Power-Good Monitoring and Output Crowbar sections of the datasheet.

ADP3198AJCPZ-RL-AD Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: ADP3198A

Package/Case:: 40-VFQFN Exposed Pad, CSP

Packaging:: Bulk

Product Status:: Active

Applications:: Controller, Intel VRM

Voltage - Input:: 12V

Number of Outputs:: 8

Voltage - Output:: 0.5V ~ 1.6V

Operating Temperature:: 0°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 40-LFCSP-VQ (6x6)

ADP3198AJCPZ-RL-AD FAQ

1.How can I place an order for ADP3198AJCPZ-RL-AD through Aetrix?

Please submit a Request for Quotation (RFQ) for ADP3198AJCPZ-RL-AD 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 ADP3198AJCPZ-RL-AD reliable?

The price and inventory of ADP3198AJCPZ-RL-AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADP3198AJCPZ-RL-AD is usually 5 days.

3.What payment methods are accepted for ADP3198AJCPZ-RL-AD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADP3198AJCPZ-RL-AD transactions.

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ADP3198AJCPZ-RL-AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADP3198AJCPZ-RL-AD 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 ADP3198AJCPZ-RL-AD?

For technical support, including ADP3198AJCPZ-RL-AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADP3198AJCPZ-RL-AD requirements.

6.How does Aetrix verify that ADP3198AJCPZ-RL-AD is sourced from the original manufacturer or authorized distributors?

All ADP3198AJCPZ-RL-AD 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 ADP3198AJCPZ-RL-AD meets industry standards.

7.What is the process for return or replacement of ADP3198AJCPZ-RL-AD?

All ADP3198AJCPZ-RL-AD units undergo pre-shipment inspection (PSI). If there is an issue with ADP3198AJCPZ-RL-AD, 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 ADP3198AJCPZ-RL-AD part is unused and in its original packaging.

Return procedure for ADP3198AJCPZ-RL-AD:

1.Submit a request within 90 days.

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

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