UCD90120A 12-Rail Power Supply Sequencer and Monitor with ACPI Support | TI.com


12-Rail Power Supply Sequencer and Monitor with ACPI Support


The most current UCD90xxx PMBus™ Command Reference is available at http://www.ti.com/fusiondocs


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.


  • 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
    • 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
  • 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
  • JTAG and I2C/SMBus/PMBus™ Interfaces

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Parametrics Compare all products in Sequencers

Number of supplies monitored
VCC (Min) (V)
VCC (Max) (V)
Iq (Typ) (uA)
Time Delay (ms)
Number of sequenced outputs
Package Group
Package size: mm2:W x L (PKG)
UCD90120A UCD90124A UCD90160A UCD90320 UCD9090A
13     12     16     32     10    
3     3     3     3.15     3    
3.6     3.6     3.6     3.63     3.6    
50000     50000     50000     31400     50000    
Programmable     Programmable     Programmable     Programmable     Programmable    
12     12     16     32     10    
Catalog     Catalog     Catalog     Catalog     Catalog    
VQFN | 64     VQFN | 64     VQFN | 64     NFBGA | 169     VQFN | 48    
64VQFN: 81 mm2: 9 x 9 (VQFN | 64)     64VQFN: 81 mm2: 9 x 9 (VQFN | 64)     64VQFN: 81 mm2: 9 x 9 (VQFN | 64)     169NFBGA: 144 mm2: 12 x 12 (NFBGA | 169)     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)