Texas Instruments UCD9090RGZT

Overview

UCD9090RGZT from Texas Instruments is a 10-rail PMBus/I²C-addressable power-supply sequencer and monitor featuring a 12-bit ADC (2.5 V ±0.5% internal reference), 400 μs per-rail sampling, closed-loop margining for all 10 rails, and support for ACPI-compliant pin-selected rail states. It enables precise sequencing, real-time fault logging, and system-level health reporting in multi-rail server and telecom power systems.

For engineers reviewing the UCD9090RGZT datasheet, UCD9090RGZT pinout, UCD9090RGZT application, or UCD9090RGZT equivalent, this device delivers deterministic timing control across up to 10 voltage domains, programmable undervoltage/overvoltage thresholds per rail, nonvolatile fault logging with timestamps, and dual-mode control via PMBus or GPIO-based Boolean logic.

Technical Context

The UCD9090RGZT integrates a 12-bit SAR ADC with 0–2.5 V input range (MON1–MON10) and 0.2–2.5 V range (MON11), sampling all monitored rails every 400 μs. Its sequencing engine supports time-, rail-, and pin-based dependencies with configurable on/off delays and POWER_GOOD validation windows.

It provides two PWM subsystems: eight FPWM outputs (15.26 kHz–125 MHz) for high-frequency margining/synchronization, and two GPI-configurable PWMs (0.93 Hz–7.81 MHz) for low-speed control. All 23 GPIOs are software-reconfigurable as inputs, outputs, or PWMs, with Boolean logic builders enabling state-driven GPO responses to faults, warnings, or POWER_GOOD signals.

Key Specifications

Pinout & Package

UCD9090RGZT is housed in a 48-pin VQFN package (7.0 mm × 7.0 mm) with exposed thermal pad tied to ground. The package supports high-density PCB layouts and efficient thermal dissipation in multi-rail power management applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UCD90120ARGCT, UCD9090RGZT offers identical sequencing precision and fault logging in a smaller 48-pin footprint - ideal for space-constrained 10-rail designs. Against LM25066AIPWR, it delivers comprehensive multi-rail orchestration rather than single-rail protection, eliminating external coordination logic.

Availability

UCD9090RGZT is available at Aetrix Electronics and suitable for server motherboard design, telecom line card development, and industrial PLC power subsystems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for UCD9090RGZT 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power system solutions.

The UCD9090RGZT belongs to TI's Fusion Digital Power™ sequencer family, engineered specifically for deterministic, PMBus-managed power sequencing and health monitoring in mission-critical computing and communications infrastructure.

FAQ

What is the maximum number of voltage rails the UCD9090RGZT can monitor and sequence?

The UCD9090RGZT monitors and sequences up to 10 independent voltage rails. Each rail is assigned a dedicated analog monitor input (MON1–MON10), supports programmable undervoltage and overvoltage thresholds, and participates in time- or dependency-based sequencing. MON11 is an additional analog input but is not counted toward the 10-rail sequencing limit.

Does the UCD9090RGZT support closed-loop voltage margining, and how is it implemented?

Yes, the UCD9090RGZT supports closed-loop margining on all 10 rails using its eight FPWM outputs (FPWM1–FPWM8). These outputs generate high-frequency PWM signals that interface with external DC-DC converter margining pins (e.g., TRIM or REF_IN), adjusting output voltage to match user-defined margin-high and margin-low thresholds in real time.

How does the UCD9090RGZT handle fault logging and retention?

The UCD9090RGZT stores up to 30 fault events (e.g., overvoltage, undervoltage, thermal warning) with timestamps in on-chip nonvolatile flash memory. Data retention exceeds 100 years at 25°C, and fault entries include rail identifier, timestamp, threshold violation type, and associated system state - enabling robust post-failure diagnostics without external memory.

Can the UCD9090RGZT operate without a PMBus host controller?

Yes, the UCD9090RGZT supports fully autonomous operation using pin-based control. Up to 8 GPIOs can be configured as GPIs to drive Boolean logic that controls up to 10 GPOs - enabling ACPI-compliant rail state selection, fault shutdown, or reset generation without PMBus communication or host intervention.

What package and thermal characteristics define the UCD9090RGZT's layout requirements?

The UCD9090RGZT uses a 48-pin VQFN package (7.0 mm × 7.0 mm) with an exposed thermal pad. Its thermal metrics include RθJA = 25°C/W and RθJB = 5.5°C/W, requiring a minimum 4-layer PCB with dedicated ground plane and thermal vias under the pad to maintain junction temperature ≤125°C at full load and 110°C ambient.