TPS51916 Memory Power Solution

By Texas Instruments 72

TPS51916 Memory Power Solution

Texas Instruments' TPS51916 provides a complete power supply for DDR2, DDR3 and DDR3L memory systems with an extremely low total cost and minimal space requirements. It integrates a synchronous buck regulator controller (VDDQ) with a 2 A sink/source tracking LDO (VTT) and buffered low noise reference (VTTREF). The TPS51916 employs D-CAP™ mode coupled with 300 kHz/400 kHz frequencies for ease-of-use and fast transient response or D-CAP2™ mode coupled with higher 500 kHz/670 kHz frequencies to support ceramic output capacitor without an external compensation circuit. The VTTREF tracks VDDQ/2 within excellent 0.8% accuracy. The VTT, which provides 2 A sink/source peak current capabilities, requires only 10 µF of ceramic capacitance.


  • Synchronous Buck Controller (VDDQ)
    • Conversion voltage range: 3 V to 28 V
    • Output voltage range: 0.7 V to 1.8 V
    • 0.8% VREF accuracy
    • Selectable control architecture D-CAP mode for fast transient response D-CAP2 mode for ceramic output capacitors
    • Selectable 300 kHz/ 400 kHz/ 500 kHz/ 670 kHz switching frequencies
    • Optimized efficiency at light and heavy loads with auto-skip function
    • Supports soft-off in S4/S5 states
    • OCL/OVP/UVP/UVLO protections
    • Powergood output
  • Thermal shutdown
  • 20-pin, 3 mm × 3 mm, QFN package
  • 2 A LDO(VTT), buffered reference(VTTREF)
    • 2 A (peak) sink and source current
    • Requires only 10 µF of ceramic output capacitance
    • Buffered, low noise, 10 mA VTTREF output
    • 0.8% VTTREF, 20 mV VTT accuracy
    • Support high-Z in S3 and soft-off in S4/S5


  • DDR2/DDR3/DDR3L memory power supplies
  • SSTL_18, SSTL_15, SSTL_135 and HSTL termination