Texas Instruments UCD90124RGCR

Overview

UCD90124RGCR from Texas Instruments is a 12-rail PMBus/I²C-addressable power-supply sequencer and system health monitor with closed-loop margining, fan control, and nonvolatile fault logging. It integrates a 12-bit ADC (0.5% internal VREF), monitors up to 13 analog inputs (voltage/current/temperature), supports 26 GPIOs (12 with PWM), and operates across –40°C to +110°C for server and telecom power management.

For engineers reviewing the UCD90124RGCR datasheet, UCD90124RGCR pinout, UCD90124RGCR application, or UCD90124RGCR equivalent, this device delivers deterministic rail sequencing based on time, voltage thresholds, or pin dependencies; real-time closed-loop margining for 10 rails; four independent fan-control loops with tach monitoring; and robust fault logging with up to 10 entries per rail in on-chip flash memory.

Technical Context

The UCD90124RGCR implements a programmable sequencing engine with Boolean logic builder for complex turn-on/off dependencies across 12 rails, using 13 monitored inputs (MON1–MON13) with configurable UV/OV thresholds and power-good windows. Its 12-bit ADC samples all rails every 400 ms with 0.5% internal reference accuracy over temperature.

It supports dual-mode control: PMBus/I²C commands (PMBus v1.1 compliant) or pin-based operation via PMBUS_CNTRL, GPIOs, and cascading inputs. Margining uses dedicated PWM outputs (FPWM1–FPWM8) to adjust DC-DC feedback nodes, enabling precise closed-loop voltage adjustment within ±0.5% of target for up to 10 rails.

Key Specifications

Pinout & Package

UCD90124RGCR is housed in a 64-pin QFN (RGC) package with exposed thermal pad. Pin assignment includes 13 analog monitor inputs (MON1–MON13), 26 GPIOs (12 with PWM capability), 4 fixed- and 8 programmable-PWM outputs, dual PMBus interface pins (CLK/DATA), JTAG test interface, and dedicated power/ground domains (V33A, V33D, V33DIO1/2, AVSS/DVSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCD90124RGCR, UCD90120ARGCT omits closed-loop margining-requiring external DACs or manual calibration-while UCD9090ARGCT reduces rail count and GPIO resources, trading scalability for footprint and cost savings in less demanding applications.

Availability

UCD90124RGCR is available at Aetrix Electronics and suitable for server motherboard design, telecom line card development, industrial ATE systems, and embedded computing platforms requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for UCD90124RGCR 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 leader delivering analog, embedded processing, and power management solutions with emphasis on reliability, integration, and system-level innovation.

The UCD90124RGCR belongs to TI's Fusion Digital Power™ sequencer family, designed specifically for intelligent, software-configurable power management in high-reliability computing and communications infrastructure.

FAQ

What is the primary function of the UCD90124RGCR in a power system?

The UCD90124RGCR serves as a centralized 12-rail power-supply sequencer and system health monitor. It ensures correct power-up and power-down order across multiple voltage domains, detects faults (UV/OV/OT), performs closed-loop margining on up to 10 rails, controls up to four fans, and logs faults to nonvolatile memory-all without external microcontrollers. The UCD90124RGCR integrates these functions into a single IC to simplify board design and improve system reliability.

Does the UCD90124RGCR support both PMBus and pin-based sequencing control?

Yes, the UCD90124RGCR supports dual-mode sequencing: PMBus/I²C commands (including OPERATION and MFR_SPECIFIC commands) and pin-based control via the PMBUS_CNTRL input, GPIOs, and cascading signals. This allows flexible integration-either as a slave device in a master-controlled power architecture or as a standalone sequencer triggered by hardware signals. The UCD90124RGCR retains full functionality in either mode, including margining, logging, and fan control.

How many analog inputs does the UCD90124RGCR have, and what are their voltage ranges?

The UCD90124RGCR has 13 analog monitor inputs: MON1 through MON9 accept 0–2.5 V, while MON10 through MON13 accept 0.2–2.5 V. All inputs connect to a shared 12-bit ADC with 0.5% internal reference accuracy. MON10–MON13 are optimized for current-sense amplifier outputs (e.g., INA196), featuring lower input impedance (0.5–1.5 MΩ) versus MON1–MON9 (8 MΩ). The UCD90124RGCR samples all inputs every 400 ms.

Can the UCD90124RGCR perform closed-loop voltage margining, and how many rails support it?

Yes, the UCD90124RGCR supports closed-loop margining on up to 10 rails using its FPWM1–FPWM8 outputs to dynamically adjust DC-DC feedback nodes. Each margining channel compares measured rail voltage against user-defined high/low thresholds and adjusts PWM duty cycle to drive the rail precisely to target-achieving ±0.5% accuracy. The UCD90124RGCR implements this entirely in hardware, eliminating need for host processor intervention during margining tests.

What package type and thermal characteristics does the UCD90124RGCR use?

The UCD90124RGCR is packaged in a 64-pin QFN (RGC) with exposed thermal pad. Its thermal metrics include θ_JA = 26.4°C/W (JEDEC high-K board), θ_JC(bottom) = 1.7°C/W, and y_JB = 8.8°C/W. The thermal pad must be soldered to a PCB ground plane for optimal heat dissipation. The device operates from –40°C to +110°C ambient and supports junction temperatures up to +125°C. The UCD90124RGCR's RGC package enables high-density routing and efficient thermal management in space-constrained server and telecom applications.