TPS56x20 Regulator with Voltage Scaling

TPS56x20 Regulator with Voltage Scaling

Texas Instruments' TPS56X20 is a synchronous DC-DC converter IC (integrated circuit) with a voltage scaling control to power up micro-processors (MCUs) requiring core voltage (VCORE) tune-ups. After the initial power up, the output voltage can be programmed/scaled by VID codes sent over an I²C-compatible bus.

This step-down (buck) converter employs an adaptive on-time D-CAP2 mode control which provides a very fast transient response with no external components. Unlike traditional voltage-/current-mode controls, the D-CAP2 supports seamless transition between PWM mode for higher load and Eco-mode for light load. Eco-mode maintains high efficiency in light-load.

The TPS56X20 supports both ultra-low ESR ceramic capacitors and low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP. The device is optimized for a small 1.0 µH to 2.2 µH inductor-saving PCB area.

  • D-CAP2 control
    • Input voltage range: 4.5 to 17 V
    • Switching frequency: 500 kHz
    • Optimized for a 1.0 to 2.2 µH inductor
  • ±1% output voltage accuracy
  • Features via I²C-compatible interface
    • Output Voltage (VID): 0.6 to 1.87 V in 10 mV
    • Auto-skip eco-mode ON/OFF (light-load)
    • Current limit target: 40% to 160%
    • Enabling IC, reading-back power-good
    • Hiccup-mode protection ON/OFF
  • IC terminal features
    • Start-up by using external resistors output voltage with VFB pin: 0.6 to 1.87 V
    • Adjustable soft-start, monotonic pre-biased start-up
    • Power-good
    • I²C address programming (2 bits)
  • Cycle-by-cycle overcurrent-limiting control
  • Thermal Shutdown (TSD)
  • Undervoltage Lockout (UVLO)