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.