1 Features
1• 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, or
670 kHz Switching Frequencies
– Optimized Efficiency at Light and Heavy Loads
with Auto-skip Function
– Supports Soft-Off in S4 and S5 States
– OCL/OVP/UVP/UVLO Protections
– Powergood Output
• 2-A LDO(VTT), Buffered Reference(VTTREF)
– 2-A (Peak) Sink and Source Current
– Buffered, Low Noise, 10-mA VTTREF Output
– 0.8% VTTREF, 20-mV VTT Accuracy
– Supports High-Z (S3) and Soft-Off (S4, S5)
• Thermal Shutdown
• 20-Pin, 3 mm × 3 mm, QFN Package
• Create a WEBENCH Design

2 Applications
• Memory Power Supplies: DDR2, DDR3, DDR3L,
DDR4
• Termination: SSTL_18, SSTL_15, SSTL_135,
HSTL

3 Description
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
available.
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.