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.