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FEATURES

DESCRIPTION

APPLICATIONS

1

2

3

4

20

19

18

17

VBST

DRVH

LL

DRVL

VLDOIN

VTT

VTTGND

VTTSNS

TPS51116PWP

5

6

7

8

GND

MODE

COMP

9

10 VDDQSET

VTTREF

VDDQSNS

16

15

14

13

PGND

CS

V5IN

PGOOD

12

11

S5

S3

C1

Ceramic

R1

R2

S5

S3

5V_IN

PGOOD

GND

GND

C5

Ceramic

2

× 10 µF

C8

SP−CAP

2

× 150 µF

C2

Ceramic

4.7

µF

L1

1

µH

C4

Ceramic

0.033

µF

C3

Ceramic

2

× 10 µF

UDG−04058

TYPICAL APPLICATION

(DDR2)

0.1

µF

VTT

0.9 V

2 A

VDDQ

1.8 V

10 A

VREF

0.9 V

10 mA

TPS51116

SLUS609A – MAY 2004 – REVISED JUNE 2004

COMPLETE DDR AND DDR2 MEMORY POWER SOLUTION

SYNCHRONOUS BUCK CONTROLLER, 3-A LDO, BUFFERED REFERENCE

•

Synchronous Buck Controller (VDDQ)

The TPS51116 provides a complete power supply for

both DDR/SSTL-2 and DDR2/SSTL-18 memory sys-

– Wide-Input Voltage Range: 3.0-V to 28-V

tems. It integrates a synchronous buck controller with

– D–CAP™ Mode with 100-ns Load Step Re-

a 3-A sink/source tracking linear regulator and

sponse

buffered low noise reference. The TPS51116 offers

– Current Mode Option Supports Ceramic

the lowest total solution cost in systems where space

Output Capacitors

is at a premium. The TPS51116 synchronous control-

ler runs fixed 400kHz pseudo-constant frequency

– Supports Soft-Off in S4/S5 States

PWM with an adaptive on-time control that can be

configured in D-CAP™ Mode for ease of use and

– 2.5-V (DDR), 1.8-V (DDR2) or Adjustable

fastest transient response or in current mode to

Output (1.5-V to 3.0-V)

support

ceramic

output

capacitors.

The

3-A

sink/source LDO maintains fast transient response

– Equipped with Powergood, Overvoltage Pro-

only requiring 20-µF (2

× 10 µF) of ceramic output

tection and Undervoltage Protection

capacitance. In addition, the LDO supply input is

•

3-A LDO (VTT), Buffered Reference (VREF)

available externally to significantly reduce the total

– Capable to Sink and Source 3 A

power losses. The TPS51116 supports all of the

sleep state controls placing VTT at high-Z in S3

– LDO Input Available to Optimize Power

(suspend to RAM) and discharging VDDQ, VTT and

Losses

VTTREF (soft-off) in S4/S5 (suspend to disk). The

– Requires only 20-µF Ceramic Output Ca-

TPS51116 has all of the protection features including

pacitor

thermal shutdown and is in a 20-pin HTSSOP

PowerPAD™ package.

– Buffered Low Noise 10-mA Output

– Accuracy

±20 mV for both VREF and VTT

– Supports High-Z in S3 and Soft-Off in S4/S5

•

DDR/DDR2 Memory Power Supplies

– Thermal Shutdown

•

SSTL-2 SSTL-18 and HSTL Termination

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004, 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.