Texas Instruments UCD90120ARGCT

Overview

UCD90120ARGCT from Texas Instruments is a 12-rail PMBus/I²C-addressable power-supply sequencer and monitor with closed-loop margining for up to 10 rails, 12-bit ADC (2.5 V ±0.5% internal reference), 400 μs per-rail sampling, and support for ACPI-compliant low-power states in server and telecom systems.

For engineers reviewing the UCD90120ARGCT datasheet, UCD90120ARGCT pinout, UCD90120ARGCT application, or UCD90120ARGCT equivalent, this device delivers deterministic sequencing control, real-time rail health monitoring, nonvolatile fault logging, programmable watchdog timing, and flexible GPIO/PWM resource allocation across 26 digital I/O pins.

Technical Context

The UCD90120ARGCT integrates a 12-bit SAR ADC with 0.5% internal 2.5-V reference, sampling all 12 monitored rails every 400 μs. It implements a configurable sequencing engine with time-, rail-, and pin-based dependencies, supporting both PMBus command-driven and hardware GPI-triggered state transitions.

Its closed-loop margining architecture uses eight FPWM outputs (15.26 kHz–125 MHz) and four dedicated PWM outputs (0.93 Hz–7.81 MHz) to adjust DC-DC feedback nodes. Boolean logic GPOs (up to 12) accept inputs from GPIs, POWER_GOOD flags, and fault signals to generate custom system-level responses without host intervention.

Key Specifications

Pinout & Package

UCD90120ARGCT is housed in a 64-pin VQFN package (9.0 mm × 9.0 mm) with exposed thermal pad tied to ground plane. The package supports high-density PCB layouts and efficient thermal dissipation in multi-rail power systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power supply sequencing and monitoring applications.

Compared with UCD90120ARGCT, UCD90124ARGCT adds GPIO scalability and thermal margin without changing sequencing logic or PMBus command structure, while UCD9090ARGCT reduces footprint and BOM cost at the expense of margining capability and two monitored rails.

Availability

UCD90120ARGCT is available at Aetrix Electronics and suitable for server motherboard design, telecom line card production, and industrial PLC manufacturing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for UCD90120ARGCT 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

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The UCD90120ARGCT belongs to TI's Fusion Digital Power sequencer family, designed specifically for high-reliability, multi-rail power system management in datacenter and infrastructure equipment.

FAQ

What is the maximum number of voltage rails the UCD90120ARGCT can monitor and sequence?

The UCD90120ARGCT monitors and sequences up to 12 voltage rails. Each rail is sampled every 400 μs using its integrated 12-bit ADC. The device supports time-based, rail-dependent, and pin-triggered sequencing logic, enabling complex power-up/down sequences required in modern server and telecom platforms. All 12 rails are fully configurable for undervoltage, overvoltage, and power-good thresholds in the TI Fusion GUI.

Does the UCD90120ARGCT support closed-loop margining, and how many rails can it margin?

Yes, the UCD90120ARGCT supports closed-loop margining for up to 10 voltage rails. It uses eight FPWM outputs (15.26 kHz–125 MHz) and four additional PWM outputs to drive external DACs or optocoupler feedback networks. This allows real-time adjustment of DC-DC converter setpoints to verify rail stability at ±1% tolerance limits - critical for four-corner testing and production validation of UCD90120ARGCT-based systems.

What communication interfaces does the UCD90120ARGCT support, and what are their key timing specs?

The UCD90120ARGCT supports PMBus v1.1, SMBus, and I²C interfaces via dedicated PMBUS_CLK and PMBUS_DATA pins. It operates at 10–400 kHz bus frequencies with t(HD:STA) ≤ 0.6 μs and t(SU:DAT) ≥ 100 ns. The device also includes PMBUS_ALERT (open-drain) and PMBUS_CNTRL pins for interrupt-driven host interaction. All interfaces are electrically compatible with 3.3-V systems and require external pull-ups.

How does the UCD90120ARGCT handle fault logging and system recovery?

The UCD90120ARGCT stores up to 12 fault entries in on-chip nonvolatile flash memory, including timestamp, rail identifier, fault type (UV/OV/OC/OT), and peak value. Fault responses - such as immediate shutdown, delayed sequencing-off, or cascaded rail restart - are user-configurable via TI Fusion GUI. Recovery actions execute autonomously without host intervention, ensuring robust operation in unattended deployments of UCD90120ARGCT-based systems.

What is the operating temperature range and thermal performance of the UCD90120ARGCT?

The UCD90120ARGCT operates from –40°C to +110°C ambient temperature, with a maximum junction temperature of 125°C. Its 64-pin VQFN package has RθJA = 26.4°C/W and RθJB = 1.7°C/W, enabling reliable thermal coupling to PCB ground planes. The device includes internal temperature sensors (TEMP0.8V, TEMP12V) and supports remote diode monitoring, making UCD90120ARGCT suitable for thermally constrained server and storage applications.