Analog Devices Inc. ADP3190AJRUZ-RL-AD

Overview

ADP3190AJRUZ-RL-AD from onsemi is a 6-bit programmable, 2-/3-/4-phase synchronous buck controller for Intel VRM/VRD-compliant CPU core supplies. It delivers 0.8375 V to 1.6 V output with ±9.5 mV differential sensing error over temperature, supports up to 1 MHz per phase switching frequency, and drives external high-power MOSFET drivers via logic-level PWM outputs. It is used in desktop PC power supplies for next-generation Intel processors.

For engineers reviewing the ADP3190AJRUZ-RL-AD datasheet, ADP3190AJRUZ-RL-AD pinout, ADP3190AJRUZ-RL-AD application, or ADP3190AJRUZ-RL-AD equivalent, key selection criteria include VID-programmable output voltage range, active current balancing across phases, programmable short-circuit latch-off delay, differential remote sensing accuracy, and 28-lead TSSOP package compatibility with Intel VRM 10.x timing requirements.

Technical Context

The ADP3190AJRUZ-RL-AD implements a multimode PWM Flex-Mode™ architecture with internal 6-bit VID DAC, enabling precise core voltage regulation from 0.8375 V to 1.6 V. Its differential sensing (FB/FBRTN) achieves ±9.5 mV worst-case error over 0°C to 85°C, and its current-sense amplifier uses CSSUM/CSREF/CSCOMP inputs for accurate total output current measurement.

Phase configuration is determined dynamically at startup by monitoring PWM3/PWM4 logic states: floating = 4-phase, PWM4 grounded = 3-phase, PWM3+PWM4 grounded = 2-phase. The RT pin sets master oscillator frequency (0.25–4 MHz), divided by active phase count to yield per-phase frequency, while RAMPADJ adjusts internal PWM ramp slope for transient optimization.

Key Specifications

Pinout & Package

The ADP3190AJRUZ-RL-AD is housed in a 28-lead TSSOP package (JEDEC MO-153, 4.4 mm × 9.7 mm), lead pitch 0.65 mm, with exposed thermal pad. Pin 19 is GND; pins 24–27 are PWM outputs; pins 20–23 are SW current-balance inputs; pins 1–6 are VID0–VID5 inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3188ARUZ, ADP3190AJRUZ-RL-AD adds integrated shunt regulation for direct 12 V system rail use and tighter current-limit timing control; compared with ISL6322AIRZ, it lacks digital telemetry but offers simpler analog VID interface and lower BOM cost for VRM 10.x applications.

Availability

ADP3190AJRUZ-RL-AD is available at Aetrix Electronics and suitable for desktop PC motherboard production, VRM module manufacturing, and game console power supply development requiring stable component supply and long-term industrial availability.

Supply support for ADP3190AJRUZ-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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient power management, analog, and sensor solutions for automotive, industrial, and computing markets.

The ADP3190AJRUZ-RL-AD belongs to onsemi's high-performance CPU power controller product line, designed specifically for Intel VRM/VRD-compliant multiphase core voltage regulation in desktop and workstation platforms.

FAQ

What is the function of the RAMPADJ pin on the ADP3190AJRUZ-RL-AD?

The RAMPADJ pin on the ADP3190AJRUZ-RL-AD sets the slope of the internal PWM ramp by accepting an external resistor from the system input voltage (e.g., 12 V). This adjustment directly influences transient response speed and current-balancing accuracy across phases. A steeper ramp improves load-step recovery but may reduce noise immunity; the value is tuned empirically per board layout and inductor DCR. The ADP3190AJRUZ-RL-AD datasheet specifies RAMPADJ input current range (0–100 μA) and voltage offset (±50 mV relative to FB) to guide selection.

How does the ADP3190AJRUZ-RL-AD achieve active current balancing between phases?

The ADP3190AJRUZ-RL-AD achieves active current balancing by monitoring switch-node voltages (SW1–SW4) through dedicated inputs, comparing them against a common reference, and adjusting PWM duty cycles in real time using an internal balancing circuit. This ensures ≤5% current mismatch across active phases under both steady-state and transient conditions. The design allows optional external resistors (RSWx) in series with each SW pin to fine-tune thermal balance-critical for asymmetric cooling in compact form factors. The ADP3190AJRUZ-RL-AD's current-balance circuit operates independently from the main voltage loop.

Can the ADP3190AJRUZ-RL-AD operate with a 5 V input supply?

No-the ADP3190AJRUZ-RL-AD is the 12 V system-rail variant and requires a 12 V input applied through a 240 Ω series resistor to the VCC pin to generate its internal 5 V bias. For 5 V system-rail operation, the pin-compatible ADP3190A variant (e.g., ADP3190AARUZ) must be used, which employs a 10 Ω resistor and different UVLO thresholds (3.7–4.3 V). Using ADP3190AJRUZ-RL-AD with 5 V violates absolute maximum ratings and will prevent proper startup or cause functional failure.

What is the purpose of the FBRTN pin on the ADP3190AJRUZ-RL-AD?

The FBRTN pin on the ADP3190AJRUZ-RL-AD serves as the low-current (100 μA typical) reference return for both the internal 6-bit VID DAC and the error amplifier, enabling true differential remote sensing. It must be connected directly to the CPU's remote sense ground point-separate from power ground-to eliminate regulation error caused by PCB trace resistance. Unlike conventional feedback, FBRTN carries minimal current, so voltage drop across shared ground paths does not affect output accuracy. This architecture ensures the ADP3190AJRUZ-RL-AD maintains ±9.5 mV sensing error over temperature and load.

How is phase count configured on the ADP3190AJRUZ-RL-AD?

Phase count on the ADP3190AJRUZ-RL-AD is configured automatically at power-up by sampling the logic states of PWM3 and PWM4 pins: both floating = 4-phase; PWM4 grounded = 3-phase; PWM3 and PWM4 grounded = 2-phase. During the first two oscillator cycles, internal comparators check each pin against a 300 mV threshold; external pull-downs must exceed 25 kΩ to avoid false detection. Once configured, the controller divides the master clock (set by RT) by the active phase count to determine per-phase frequency. No registers or external programming are required-configuration is purely hardware-driven.