The TPS51916 device provides a complete power supply for DDR2, DDR3,
DDR3L, and DDR4 memory systems in the lowest total cost and minimum space. It integrates a
synchronous buck regulator controller (VDDQ) with a 2-A sink and
2-A source tracking LDO (VTT) and buffered low noise reference (VTTREF).
The device employs D-CAP™ mode coupled with 300 kHz or 400 kHz
frequencies for ease-of-use and fast transient response or D-CAP2™ mode coupled with higher
500 kHz or 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 and 2-A source peak
current capabilities, requires only 10-µF of ceramic capacitance. A dedicated LDO supply input is
The device also provides excellent power supply performance. It supports flexible power
state control, placing VTT at high-Z in S3 and discharging VDDQ, VTT and VTTREF (soft-off) in S4 or
S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP, UVP,
UVLO and thermal shutdown protections are also available.
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