DDR2/DDR3/DDR3L/DDR4 Termination Regulator 2A 4.5V to 5.5V 20-Pin WQFN T/R

The TPS51916 provides a complete power supply for DDR2, DDR3 and DDR3L memory systems in the lowest total cost and minimum space. 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. In addition, a dedicated LDO supply input is available.The TPS51916 provides rich useful functions as well as 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/S5 state. Programmable OCL with low-side MOSFET RDS(on) sensing, OVP/UVP/UVLO and thermal shutdown protections are also available.The TPS51916 is available in a 20-pin, 3 mm × 3 mm, QFN package and is specified for ambient temperature from –40°C to 85°C.

Synchronous Buck Controller (VDDQ)

• Conversion Voltage Range: 3 V to 28 V
• Output Voltage Range: 0.7 V to 1.8 V
• 0.8% V_REF Accuracy
• Selectable Control ArchitectureD-CAP Mode for Fast TransientResponseD-CAP2 Mode for Ceramic OutputCapacitors
• 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

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

Thermal Shutdown

20-Pin, 3 mm × 3 mm, QFN Package