Texas Instruments UCD90120RGCR

Overview

UCD90120RGCR from Texas Instruments is a 12-channel digital power supply sequencer and system health monitor with integrated 12-bit ADC, 13 analog monitor inputs, 26 GPIOs (12 configurable as PWM), PMBus/I²C/SMBus interface, and non-volatile fault logging - used for precise rail sequencing and closed-loop margining in multi-rail server and telecom power systems.

For engineers reviewing the UCD90120RGCR datasheet, UCD90120RGCR pinout, UCD90120RGCR application, or UCD90120RGCR equivalent, key selection criteria include 200 µs per-rail sampling rate, <80 µs hardware comparator fault response, programmable UV/OV thresholds per rail, 64-pin QFN package compatibility, and Fusion Digital Power GUI configurability for production-ready sequencing logic.

Technical Context

The UCD90120RGCR implements a deterministic, time- and event-driven sequencing engine that supports dependencies across rails, GPIs, and external pins. Its 12-bit SAR ADC samples all 13 monitor inputs every 200 µs using a 2.5 V ±0.5% internal reference, enabling real-time voltage, current (via external sense amps), and temperature monitoring.

Hardware comparators on MON1–MON6 provide sub-80 µs fault detection independent of firmware execution, while six dedicated comparators support immediate shutdown, retry, or cascaded sequencing responses. Margining outputs operate in closed loop to adjust rail voltages to user-defined thresholds, with unused outputs reconfigurable as GPIOs or general-purpose PWMs up to 125 MHz.

Key Specifications

Pinout & Package

64-pin QFN (RGCR) package with exposed thermal pad (PowerPAD™), 0.5 mm pitch, 9 mm × 9 mm body size. Pin functions validated per TI SLVS966 datasheet Rev. E (2009).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCD90120RGCR, the UCD90124RGCT offers direct scalability within the same footprint and toolchain, whereas the LM9926PWR requires external firmware development and lacks autonomous fault response - making UCD90120RGCR optimal for complex, self-contained, and field-diagnosable power systems.

Availability

UCD90120RGCR is available at Aetrix Electronics and suitable for server motherboard design, telecom line card manufacturing, industrial PLC backplane integration, and ATE power subsystem development requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for UCD90120RGCR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and communications market reach.

The UCD90120RGCR belongs to TI's Fusion Digital Power™ sequencer family, designed specifically for intelligent, autonomous, and standards-compliant power rail management in high-reliability computing and infrastructure equipment.

FAQ

What is the maximum number of voltage rails the UCD90120RGCR can sequence?

The UCD90120RGCR supports sequencing of up to 12 independent voltage rails. Each rail can be configured with turn-on/turn-off delay times, dependencies on other rails or GPIOs, and Power Good thresholds. The device uses 26 GPIOs - 12 of which are configurable as PWM outputs - to drive enable pins of DC-DC converters or LDOs. Rail definitions are stored in on-chip flash and managed via TI's Fusion Digital Power GUI.

Does the UCD90120RGCR support closed-loop voltage margining?

Yes, the UCD90120RGCR supports closed-loop margining for up to 10 rails. It adjusts output voltages in real time to match user-defined high and low margin thresholds using feedback from its 12-bit ADC and internal 2.5 V ±0.5% reference. Unused margining outputs can be reassigned as general-purpose GPIOs or PWMs. This capability eliminates need for external DACs or op-amp circuits in production test and qualification environments.

How fast does the UCD90120RGCR detect and respond to power supply faults?

The UCD90120RGCR achieves fault detection and response in less than 80 µs for rails monitored by MON1–MON6, using dedicated hardware comparators independent of firmware execution. For other monitor inputs (MON7–MON13), fault detection occurs via the 12-bit ADC with a 200 µs per-rail sampling interval and software-based threshold checking. Fault responses include immediate shutdown, retry, cascaded rail sequencing, or assertion of PMBALERT#.

Can the UCD90120RGCR operate without an external microcontroller?

Yes, the UCD90120RGCR operates autonomously after configuration is written to its on-chip flash memory. It executes sequencing logic, monitors rails, logs faults, and manages margining without host processor involvement. Communication interfaces (PMBus/I²C/SMBus and JTAG) are used only for initial setup, runtime monitoring, or reconfiguration - not for real-time control. The device includes an internal oscillator and requires only three 3.3 V supply domains.

What package type and thermal characteristics does the UCD90120RGCR use?

The UCD90120RGCR is packaged in a 64-pin QFN (RGCR) with an exposed thermal pad (PowerPAD™), measuring 9 mm × 9 mm with 0.5 mm pitch. It operates across –40°C to +110°C ambient temperature and supports junction temperatures up to +125°C. Thermal performance is enhanced by soldering the PowerPAD to a PCB ground plane; recommended layout includes thermal vias under the pad per TI's PCB guidelines in SLVS966.