Texas Instruments TPS51123A Dual-Synchronous Step-Down Controllers

Texas Instruments TPS51123A Dual-Synchronous Step-Down Controllers are wide-input voltage devices targeted for notebook system power supply solutions. The TI TPS1123A supports high-efficiency, fast-transient responses, and provides a combined power-good signal. Out-of-Audio™ mode light-load operation enables low acoustic noise at a much higher efficiency than conventional forced PWM operation. Texas Instruments TPS51123A step-down controllers operate with supply input voltages ranging from 5.5V to 28V and support output voltages from 2V to 5.5V.  

Features

  • Wide-Input Voltage Range: 5.5V to 28V
  • Output Voltage Range: 2V to 5.5V
  • Built-in 100mA 5V/3.3V LDO with Switches
  • Built-in 1% 2V Reference Output
  • With/Without Out-of-Audio™ Mode Selectable Light-Load and PWM-Only Operation
  • Internal 1.6ms Voltage Servo Soft-Start
  • Adaptive On-Time Control Architecture with Four Selectable Frequency Setting
  • 4500ppm/°C RDS(on) Current Sensing
  • Built-In Output Discharge
  • Power Good Output
  • Built-in OVP/UVP/OCP
  • Thermal Shutdown (Non-latch)
  • 24-Pin QFN (RGE) Package

Applications

  • Notebook Computers
  • I/O Supplies
  • System Power Supplies

Block Diagram

Block Diagram - Texas Instruments TPS51123A Dual-Synchronous Step-Down Controllers
Published: 2012-01-06 | Updated: 2022-03-11