Analog Devices Inc. ADP3191JRQZ-RL

Overview

ADP3191JRQZ-RL from Analog Devices is a 6-bit programmable, 2-/3-/4-phase synchronous buck controller optimized for Intel VRM/VRD-compliant CPU core power supplies. It delivers 0.8375 V to 1.6 V output via VID DAC, supports up to 1 MHz per phase, achieves ±14.5 mV differential sensing error over temperature, and drives external high-power MOSFET drivers via logic-level PWM outputs - deployed in desktop PC VRM modules for next-generation Intel processors.

For engineers reviewing the ADP3191JRQZ-RL datasheet, ADP3191JRQZ-RL pinout, ADP3191JRQZ-RL application, or ADP3191JRQZ-RL equivalent, key selection criteria include phase configurability (2/3/4), VID-programmable output voltage range, current-balancing architecture, differential remote sensing accuracy, and compatibility with ADP3110A gate drivers in high-current, low-voltage CPU power delivery systems.

Technical Context

The ADP3191JRQZ-RL implements a multimode PWM Flex-Mode™ architecture with independent phase control logic, enabling dynamic selection of 2-, 3-, or 4-phase operation via PWM3/PWM4 pin grounding. Its internal 6-bit VID DAC interfaces directly with Intel-compatible CPUs to set output voltage between 0.8375 V and 1.6 V referenced to FBRTN.

It integrates active current balancing across all enabled phases using SW1–SW4 inputs, employs differential current sensing at CSSUM/CSREF for load-line positioning and short-circuit protection, and uses RAMPADJ-adjustable internal PWM ramp slope to optimize transient response and thermal balance without requiring external current-sense resistors.

Key Specifications

Pinout & Package

ADP3191JRQZ-RL is housed in a 28-lead TSSOP package (JEDEC MO-153, 4.4 mm × 9.7 mm body, 0.65 mm pitch), thermally enhanced for high-current VRM applications and compatible with standard surface-mount reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3191A and ISL6322IRZ, ADP3191JRQZ-RL provides optimal balance of phase scalability (2–4), 12 V direct-bias support via shunt regulator, and logic-level output compatibility with industry-standard gate drivers - making it ideal for cost-sensitive, thermally demanding desktop VRM implementations where design reuse and layout simplicity are critical.

Availability

ADP3191JRQZ-RL is available at Aetrix Electronics and suitable for desktop PC VRM modules, gaming console core power supplies, and Intel processor reference designs requiring stable component supply, long-lifecycle support, and consistent electrical performance across production batches.

Supply support for ADP3191JRQZ-RL 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, communications, and computing markets.

The ADP3191JRQZ-RL belongs to Analog Devices' VRM/VRD-compliant multiphase controller product line, engineered specifically for high-current, low-voltage CPU core power delivery with emphasis on transient response, current balancing, and VID-based programmability.

FAQ

What is the function of the RAMPADJ pin on the ADP3191JRQZ-RL?

The RAMPADJ pin on the ADP3191JRQZ-RL sets the slope of the internal PWM ramp by connecting an external resistor from the converter input voltage to this pin. This adjustment directly influences transient response speed and current-loop stability. Proper RAMPADJ configuration ensures optimal phase current sharing and minimizes overshoot during load steps - a critical requirement for reliable ADP3191JRQZ-RL operation in high-performance CPU power systems.

How does the ADP3191JRQZ-RL achieve current balancing across multiple phases?

The ADP3191JRQZ-RL achieves current balancing by monitoring individual phase currents through SW1–SW4 inputs, comparing them against a common reference derived from CSREF and CSSUM. Its internal current balancing circuit dynamically adjusts PWM duty cycles per phase to equalize average current flow. This real-time correction maintains thermal uniformity and extends MOSFET lifetime - a core capability confirmed in ADP3191JRQZ-RL's functional block diagram and theory-of-operation section.

Can the ADP3191JRQZ-RL operate with only two active phases?

Yes, the ADP3191JRQZ-RL supports 2-phase operation by grounding both PWM3 and PWM4 pins during startup. The device detects these low states within the first two oscillator cycles and disables the corresponding phases while maintaining full current balancing and VID regulation functionality across the remaining two PWM outputs - a behavior explicitly documented in the ADP3191JRQZ-RL startup sequence description.

What is the purpose of the FBRTN pin on the ADP3191JRQZ-RL?

The FBRTN pin on the ADP3191JRQZ-RL serves as the reference return for the internal VID DAC and error amplifier, enabling true Kelvin remote sensing. It carries only ~140 μA of bias current and must be connected directly to the CPU's remote sense ground point - not to PCB ground - to achieve the specified ±14.5 mV differential sensing accuracy. This dedicated return path is essential for ADP3191JRQZ-RL to meet Intel VRM voltage tolerance requirements under high-current load conditions.

Does the ADP3191JRQZ-RL support on-the-fly VID code changes?

Yes, the ADP3191JRQZ-RL supports on-the-fly VID code changes with built-in blanking for both PWRGD and crowbar functions. When the CPU updates its VID code, the ADP3191JRQZ-RL suppresses false power-good faults and premature crowbar activation for 100–250 μs, allowing smooth voltage transitions without system reset. This behavior is guaranteed by design and verified in the ADP3191JRQZ-RL's power good monitoring and crowbar timing specifications.