1 Features
1• Synchronous Buck Controller (VDDQ)
– Conversion Voltage Range: 3 to 28 V
– Output Voltage Range: 0.7 to 1.8 V
– 0.8% VREF Accuracy
– D-CAP2™ Mode for Ceramic Output
Capacitors
– Selectable 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, WQFN Package

2 Applications
• DDR2, DDR3, DDR3L, LPDDR3, and DDR4
Memory Power Supplies
• SSTL_18, SSTL_15, SSTL_135, and HSTL
Termination

3 Description
The TPS51716 provides a complete power supply for
DDR2, DDR3, DDR3L, LPDDR3, 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/source tracking LDO (VTT)
and buffered low noise reference (VTTREF). The
TPS51716 employs D-CAP2 mode coupled with
500 kHz or 670 kHz operating frequencies that
supports ceramic output capacitors without an
external compensation circuit. The VTTREF tracks
VDDQ/2 with excellent 0.8% accuracy. The VTT,
which provides 2-A sink/source peak current
capabilities, requires only 10 μF of ceramic
capacitance. In addition, the device features a
dedicated LDO supply input.
The TPS51716 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 (softoff)
in S4/S5 state. It includes programmable OCL
with low-side MOSFET RDS(on) sensing,
OVP/UVP/UVLO and thermal shutdown protections.
TI offers the TPS51716 in a 20-pin, 3 mm × 3 mm,
WQFN package and specifies it for an ambient
temperature range between –40°C and 85°C.