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UCD90120A
  • UCD90120A

UCD90120A

ACTIVE

12-Rail Power Supply Sequencer and Monitor with ACPI Support

Texas Instruments UCD90120A Product Info

1 April 2026 4

Parameters

Number of supplies monitored

13

Number of sequenced outputs

12

Rating

Catalog

Supply voltage (max) (V)

3.6

Supply voltage (min) (V)

3

Iq (typ) (mA)

50

Operating temperature range (°C)

-40 to 125

Package

VQFN (RGC)-64-81 mm² 9 x 9

Features

  • Monitor and Sequence 12 Voltage Rails
    • All Rails Sampled Every 400 µs
    • 12-bit ADC With 2.5-V, 0.5% Internal VREF
    • Sequence Based on Time, Rail and Pin Dependencies
    • Four Programmable Undervoltage and Overvoltage Thresholds per Monitor
  • Nonvolatile Error and Peak-Value Logging per Monitor (up to 12 Fault Detail Entries)
  • Closed-Loop Margining for 10 Rails
    • Margin Output Adjusts Rail Voltage to Match User-Defined Margin Thresholds
  • Programmable Watchdog Timer and System Reset
  • Flexible Digital I/O Configuration
  • Pin-Selected Rail States
  • Multiphase PWM Clock Generator
    • Clock Frequencies From 15.259 kHz to
      125 MHz
    • Capability to Configure Independent Clock Outputs for Synchronizing Switch-Mode Power Supplies
  • JTAG and I2C/SMBus/PMBus™ Interfaces
  • Monitor and Sequence 12 Voltage Rails
    • All Rails Sampled Every 400 µs
    • 12-bit ADC With 2.5-V, 0.5% Internal VREF
    • Sequence Based on Time, Rail and Pin Dependencies
    • Four Programmable Undervoltage and Overvoltage Thresholds per Monitor
  • Nonvolatile Error and Peak-Value Logging per Monitor (up to 12 Fault Detail Entries)
  • Closed-Loop Margining for 10 Rails
    • Margin Output Adjusts Rail Voltage to Match User-Defined Margin Thresholds
  • Programmable Watchdog Timer and System Reset
  • Flexible Digital I/O Configuration
  • Pin-Selected Rail States
  • Multiphase PWM Clock Generator
    • Clock Frequencies From 15.259 kHz to
      125 MHz
    • Capability to Configure Independent Clock Outputs for Synchronizing Switch-Mode Power Supplies
  • JTAG and I2C/SMBus/PMBus™ Interfaces

Description

The UCD90120A is a 12-rail PMBus/I2C addressable power-supply sequencer and monitor. The device integrates a 12-bit ADC for monitoring up to 12 power-supply voltage inputs. Twenty-six GPIO pins can be used for power supply enables, power-on reset signals, external interrupts, cascading, or other system functions. Twelve of these pins offer PWM functionality. Using these pins, the UCD90120A offers support for margining, and general-purpose PWM functions.

Specific power states can be achieved using the Pin-Selected Rail States feature. This feature allows with the use of up to 3 GPIs to enable and disable any rail. This is useful for implementing system low-power modes and the Advanced Configuration and Power Interface (ACPI) specification that is used for hardware devices.

The TI Fusion Digital Power™ designer software is provided for device configuration. This PC-based graphical user interface (GUI) offers an intuitive interface for configuring, storing, and monitoring all system operating parameters.

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