12

17

16

6

15

14

13

11

V5IN

TPS51916

S3

S5

VREF

VBST

DRVH

SW

DRVL

8

10

REFIN

PGND

7

19

GND

MODE

18 TRIP

20

9

2

3

PGOOD

VDDQSNS

VLDOIN

VTT

1

4

5

VTTSNS

VTTGND

VTTREF

UDG-10193

VDDQ

VTT

PGND

S3

S5

PGND

5VIN

PGND

VIN

VTTREF

AGND

AGND

Powergood

PGND

TPS51916

www.ti.com

SLUSAE1D – DECEMBER 2010 – REVISED JUNE 2012

Complete DDR2, DDR3 and DDR3L Memory Power Solution Synchronous Buck

Controller, 2-A LDO, Buffered Reference

1

FEATURES

DESCRIPTION

The TPS51916 provides a complete power supply for

2

•

Synchronous Buck Controller (VDDQ)

DDR2, DDR3 and DDR3L memory systems in the

–

Conversion Voltage Range: 3 V to 28 V

lowest total cost and minimum space. It integrates a

–

Output Voltage Range: 0.7 V to 1.8 V

synchronous buck regulator controller (VDDQ) with a

2-A sink/source tracking LDO (VTT) and buffered low

–

noise reference (VTTREF). The TPS51916 employs

–

Selectable Control Architecture

D-CAP™ mode coupled with 300 kHz/400 kHz

–

D-CAP™ Mode for Fast Transient

frequencies

for

ease-of-use

and

fast

transient

Response

response or D-CAP2™ mode coupled with higher

500 kHz/670 kHz frequencies to support ceramic

–

D-CAP2™ Mode for Ceramic Output

output capacitor without an external compensation

Capacitors

circuit. The VTTREF tracks VDDQ/2 within excellent

–

Selectable 300 kHz/ 400 kHz/ 500 kHz/

0.8%

accuracy.

The

VTT,

which

provides

2-A

670 kHz Switching Frequencies

sink/source peak current capabilities, requires only

–

Optimized Efficiency at Light and Heavy

10-

μF

of

ceramic

capacitance.

In

addition,

a

dedicated LDO supply input is available.

Loads with Auto-skip Function

–

Supports Soft-Off in S4/S5 States

The TPS51916 provides rich useful functions as well

as excellent power supply performance. It supports

–

OCL/OVP/UVP/UVLO Protections

flexible power state control, placing VTT at high-Z in

–

Powergood Output

S3 and discharging VDDQ, VTT and VTTREF (soft-

•

2-A LDO(VTT), Buffered Reference(VTTREF)

off) in S4/S5 state. Programmable OCL with low-side

MOSFET

–

2-A (Peak) Sink and Source Current

thermal shutdown protections are also available.

–

Requires Only 10-

μF of Ceramic Output

Capacitance

The TPS51916 is available in a 20-pin, 3 mm × 3

mm, QFN package and is specified for ambient

–

Buffered, Low Noise, 10-mA VTTREF

temperature from –40°C to 85°C.

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

APPLICATIONS

•

DDR2/DDR3/DDR3L Memory Power Supplies

•

SSTL_18, SSTL_15, SSTL_135 and HSTL

Termination

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

D-CAP, D-CAP2 are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2010–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.