Analog Devices Inc. ADP3198JCPZ-RL-AD

Overview

ADP3198JCPZ-RL-AD from onsemi is an 8-bit programmable, 2- to 4-phase synchronous buck controller optimized for Intel® VR10.x/VR11-compliant CPU core power supplies. It delivers ±11 mV worst-case differential sensing error over temperature, supports 0.5 V–1.6 V output via internal VID DAC, and drives external high-power MOSFET drivers with logic-level PWM outputs at up to 1 MHz per phase. Used in desktop PC VRM modules for next-generation Intel processors.

For engineers reviewing the ADP3198JCPZ-RL-AD datasheet, ADP3198JCPZ-RL-AD pinout, ADP3198JCPZ-RL-AD application, or ADP3198JCPZ-RL-AD equivalent, key selection criteria include phase programmability (2/3/4), active current balancing accuracy, VID code compatibility (VR10.x/VR11), differential remote sensing capability, and integrated thermal throttling with VRHOT/VRFAN outputs.

Technical Context

The ADP3198JCPZ-RL-AD implements a multimode PWM architecture with independent phase control logic, enabling dynamic selection of 2-, 3-, or 4-phase operation via PWMx pin strapping. Its internal 8-bit VID DAC reads processor voltage identification codes directly, setting regulation between 0.5 V and 1.6 V referenced to FBRTN.

It integrates a dedicated current-sense amplifier (CSA) with CSSUM/CSCOMP/CSREF inputs for DCR- or resistor-based total output current measurement, supporting load-line positioning and programmable short-circuit protection. The device uses a shunt-regulated 12 V-to-5 V VCC supply and operates across 0°C to 85°C ambient.

Key Specifications

Pinout & Package

The ADP3198JCPZ-RL-AD is housed in a 40-lead LFCSP package with exposed EPAD electrically connected to GND. Pin 1 is marked by a dot; EPAD must be soldered to PCB ground for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6322AIRZ-T and TPS53679RSLR, the ADP3198JCPZ-RL-AD uniquely combines VR11/VR10 dual-mode VID decoding, shunt-regulated 12 V operation, and explicit SWx pins for thermal-aware current balancing-making it optimal for cost-sensitive, thermally constrained desktop VRM designs requiring analog configurability.

Availability

ADP3198JCPZ-RL-AD is available at Aetrix Electronics and suitable for desktop PC power supplies, VRM modules, and high-performance computing PSUs requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for ADP3198JCPZ-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 is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The ADP3198JCPZ-RL-AD belongs to onsemi's high-performance power management IC portfolio, specifically engineered for Intel-compatible multiphase CPU core power delivery with emphasis on thermal robustness, VID flexibility, and analog configurability.

FAQ

What is the operating temperature range for the ADP3198JCPZ-RL-AD?

The ADP3198JCPZ-RL-AD is specified for operation across the extended commercial temperature range of 0°C to 85°C ambient. Its junction temperature is rated to 125°C, and thermal impedance (θJA) is 39°C/W. This range aligns with desktop motherboard environments where airflow and heatsinking ensure reliable long-term operation of the ADP3198JCPZ-RL-AD in VRM applications.

How does the ADP3198JCPZ-RL-AD support both VR10.x and VR11 specifications?

The ADP3198JCPZ-RL-AD supports both VR10.x and VR11 through the VIDSEL pin (Pin 40): grounding VIDSEL selects 7-bit VR10.x decoding, while tying it to VCC enables full 8-bit VR11 mode. The internal VID DAC then sets the output voltage between 0.5 V and 1.6 V with ±11 mV sensing accuracy-meeting the tighter tolerance and dynamic transition requirements of VR11, which the ADP3198JCPZ-RL-AD satisfies via programmable PWRGD blanking and crowbar timing.

Can the ADP3198JCPZ-RL-AD operate with only two phases active?

Yes, the ADP3198JCPZ-RL-AD supports 2-phase operation by strapping both PWM3 (Pin 28) and PWM4 (Pin 27) to VCC. During startup, internal comparators detect these high states and configure the controller to drive only PWM1 and PWM2. Unused SW3 and SW4 pins should be left open. This 2-phase mode reduces component count and layout complexity while maintaining active current balancing between the two active phases-verified in the ADP3198JCPZ-RL-AD functional block diagram and phase detection sequence description.

What external components define the switching frequency of the ADP3198JCPZ-RL-AD?

The switching frequency of the ADP3198JCPZ-RL-AD is set by an external resistor (RT) connected from Pin 12 (RT) to GND. The master oscillator frequency ranges from 0.25 MHz to 4 MHz depending on RT value; the per-phase frequency equals the master clock divided by the number of active phases (e.g., 800 kHz master clock ÷ 4 phases = 200 kHz per phase). This relationship is confirmed in Figure 6 and Table 1 of the ADP3198JCPZ-RL-AD datasheet, with typical RT values of 51 kΩ (800 kHz master) and 243 kΩ (200 kHz master).

Does the ADP3198JCPZ-RL-AD include protection against overcurrent conditions?

Yes, the ADP3198JCPZ-RL-AD provides programmable short-circuit protection with latch-off delay. An external resistor from Pin 11 (ILIMIT) to GND sets the current-limit threshold voltage (e.g., 121 kΩ yields 1.21 V), which determines the 80–125 mV comparator trip point relative to CSREF. Upon overcurrent detection, the DELAY capacitor sets the latch-off delay time (e.g., 10 nF → 8 ms). This protection is fully integrated and does not require external comparators-the ADP3198JCPZ-RL-AD implements it via its internal current-limit comparator and delay timer circuitry.