Texas Instruments UCD90910RGCR

Overview

UCD90910RGCR from Texas Instruments is a 10-rail I²C/PMBus-addressable power-supply sequencer and system health monitor with integrated 12-bit ADC, closed-loop margining, fan control (up to 10 fans), and nonvolatile fault logging. It supports time- and dependency-based sequencing of voltage rails including 12 V, 3.3 V, 1.8 V, and 0.8 V outputs in server and telecom power systems.

For engineers reviewing the UCD90910RGCR datasheet, UCD90910RGCR pinout, UCD90910RGCR application, or UCD90910RGCR equivalent, this device delivers deterministic rail sequencing, real-time voltage/current/temperature monitoring, programmable undervoltage/overvoltage thresholds per rail, and full configuration update capability while operating - critical for high-reliability embedded power management design.

Technical Context

The UCD90910RGCR implements a deterministic Boolean logic-based sequencing engine that evaluates time delays, rail dependencies (POWER_GOOD_ON/OFF), GPIO states, and PMBus commands to orchestrate turn-on/off sequences. Its 12-bit ADC samples up to 13 analog inputs every 400 ms using a 2.5-V ±0.5% internal reference.

It integrates ten margining PWM outputs (FPWM1–FPWM8 + PWM1–PWM4) supporting closed-loop adjustment of rail voltages against user-defined thresholds, plus dual fan-control algorithms for speed-vs-temperature setpoints across two-, three-, and four-wire fans. All configuration is stored in on-chip flash memory with 100-year retention.

Key Specifications

Pinout & Package

UCD90910RGCR is housed in a 64-pin QFN package (RGC) with exposed thermal pad. Pin functions include 13 analog monitor inputs, 26 GPIOs (12 with PWM capability), 4 dedicated PWM outputs (PWM1–PWM4), 8 fan PWM outputs (FPWM1–FPWM8), PMBus interface (CLK/DATA/ALERT/CNTRL), JTAG test pins, 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 UCD90910RGCR, UCD90160RGCT offers greater rail scalability but sacrifices integrated fan control, while LM25066AIPMM provides precise single-rail telemetry without sequencing logic - making UCD90910RGCR uniquely balanced for mid-complexity systems needing both sequencing and thermal management.

Availability

UCD90910RGCR is available at Aetrix Electronics and suitable for server power management, telecom line cards, industrial ATE systems, and storage controller boards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for UCD90910RGCR 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 specializing in analog, embedded processing, and power management technologies, with decades of leadership in digital power control ICs.

The UCD90910RGCR belongs to TI's Fusion Digital Power™ sequencer family, designed specifically for intelligent, configurable, and fault-resilient power-system supervision in high-density computing and communications infrastructure.

FAQ

What is the primary function of the UCD90910RGCR in a power system?

The UCD90910RGCR serves as a centralized 10-rail power-supply sequencer and system health monitor. It enforces precise turn-on/turn-off timing across multiple voltage domains, continuously monitors voltage, current, and temperature via its 12-bit ADC, executes closed-loop margining, controls up to 10 fans, and logs faults to nonvolatile memory - all within a single 64-pin QFN package. This makes the UCD90910RGCR ideal for complex, reliability-critical systems like servers and telecom equipment.

Does the UCD90910RGCR support real-time reconfiguration without resetting?

Yes, the UCD90910RGCR supports full configuration updates while operating normally. Engineers can modify sequencing delays, voltage thresholds, fan curves, or margining targets via PMBus commands or the TI Fusion Digital Power Designer GUI without halting system operation or triggering a reset. This capability allows dynamic adaptation to changing thermal or load conditions and simplifies field firmware updates for the UCD90910RGCR.

How many analog inputs does the UCD90910RGCR have, and what are their voltage ranges?

The UCD90910RGCR provides 13 dedicated analog monitor inputs: MON1 through MON9 accept 0–2.5 V signals, typically used for scaled-down rail voltages; MON10 through MON13 accept 0.2–2.5 V signals, optimized for current-sense amplifier outputs such as those from the INA196. All inputs are sampled every 400 ms by the integrated 12-bit ADC with a ±0.5% internal 2.5-V reference - ensuring consistent measurement accuracy across the UCD90910RGCR's operating temperature range.

Can the UCD90910RGCR perform closed-loop margining on all 10 rails simultaneously?

Yes, the UCD90910RGCR supports closed-loop margining on all 10 rails using its dedicated margining PWM outputs (including FPWM1–FPWM8 and PWM1–PWM4). Each rail can be adjusted independently to user-defined low/high margin thresholds, enabling comprehensive four-corner testing. The UCD90910RGCR compares actual rail voltage against these thresholds and dynamically adjusts the margin PWM duty cycle to maintain alignment - a core capability confirmed in the SLVSA81 datasheet and implemented in TI's Fusion GUI.

What package type and thermal characteristics apply to the UCD90910RGCR?

The UCD90910RGCR is packaged in a 64-pin QFN (RGC) with an exposed thermal pad. Its thermal metrics include a junction-to-ambient resistance (θ_JA) of 26.4°C/W and junction-to-board resistance (θ_JB) of 1.7°C/W under JEDEC-standard conditions. The device operates across –40°C to +110°C ambient temperature, with a maximum junction temperature of 125°C. These characteristics ensure reliable thermal performance in densely packed PCB layouts typical of the UCD90910RGCR's target applications.