TPS51116 Datasheet

IC型号：
TPS51116
PDF描述：
Complete DDR & DDR2 Memory Power
文件大小：
442.05KB
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ti

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TPS51116

www.ti.com

SLUS609A 鈥?MAY 2004 鈥?REVISED JUNE 2004

COMPLETE DDR AND DDR2 MEMORY POWER SOLUTION

SYNCHRONOUS BUCK CONTROLLER, 3-A LDO, BUFFERED REFERENCE

FEATURES

鈥?/div>

Synchronous Buck Controller (VDDQ)

鈥?Wide-Input Voltage Range: 3.0-V to 28-V

鈥?D鈥揅AP鈩?Mode with 100-ns Load Step Re-

sponse

鈥?Current Mode Option Supports Ceramic

Output Capacitors

鈥?Supports Soft-Off in S4/S5 States

鈥?Current Sensing from R

DS(on)

or Resistor

鈥?2.5-V (DDR), 1.8-V (DDR2) or Adjustable

Output (1.5-V to 3.0-V)

鈥?Equipped with Powergood, Overvoltage Pro-

tection and Undervoltage Protection

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

鈥?Capable to Sink and Source 3 A

鈥?LDO Input Available to Optimize Power

Losses

鈥?Requires only 20-碌F Ceramic Output Ca-

pacitor

鈥?Buffered Low Noise 10-mA Output

鈥?Accuracy

卤20

mV for both VREF and VTT

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

鈥?Thermal Shutdown

DESCRIPTION

The TPS51116 provides a complete power supply for

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

tems. It integrates a synchronous buck controller with

a 3-A sink/source tracking linear regulator and

buffered low noise reference. The TPS51116 offers

the lowest total solution cost in systems where space

is at a premium. The TPS51116 synchronous control-

ler runs fixed 400kHz pseudo-constant frequency

PWM with an adaptive on-time control that can be

configured in D-CAP鈩?Mode for ease of use and

fastest transient response or in current mode to

support ceramic output capacitors. The 3-A

sink/source LDO maintains fast transient response

only requiring 20-碌F (2

脳

10 碌F) of ceramic output

capacitance. In addition, the LDO supply input is

available externally to significantly reduce the total

power losses. The TPS51116 supports all of the

sleep state controls placing VTT at high-Z in S3

(suspend to RAM) and discharging VDDQ, VTT and

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

TPS51116 has all of the protection features including

thermal shutdown and is in a 20-pin HTSSOP

PowerPAD鈩?package.

鈥?/div>

APPLICATIONS

鈥?/div>

DDR/DDR2 Memory Power Supplies

SSTL-2 SSTL-18 and HSTL Termination

Ceramic

0.1

碌F

DRVH 19

LL 18

DRVL 17

SP鈭扖AP

脳

150

碌F

碌H

Ceramic

脳

碌F

VDDQ

1.8 V

10 A

TYPICAL APPLICATION

(DDR2)

VTT

0.9 V

GND

TPS51116PWP

1 VLDOIN

2 VTT

3 VTTGND

4 VTTSNS

VBST 20

Ceramic

脳

碌F

5 GND

Ceramic

0.033

碌F

6 MODE

7 VTTREF

8 COMP

PGND 16

CS 15

V5IN 14

PGOOD 13

S5 12

S3 11

PGOOD

UDG鈭?4058

VREF

0.9 V

10 mA

GND

5V_IN

Ceramic

4.7

碌F

9 VDDQSNS

10 VDDQSET

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.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

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