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6-A NON-ISOLATED DDR/QDR

FEATURES

NOMINAL SIZE =0.87 in x 0.5 in

(22,1 mm x 12,57 mm)

DESCRIPTION

VIN

Standby

GND

VTT

V

REF

Co

1

Low−ESR

(Required)

C

IN

(Required)

1 k

1 %

1 k

1 %

VDDQ

SSTL−2

Bus

Co

2

Ceramic

(Optional)

Q1

BSS138

(Optional)

Con

hf−Ceramic

PTHxx050Y

(Top View)

1

5

2

3

4

6

CIN = Required Electrolytic Capacitor; 220µF (3.3 ± 5 V Input), 560 µF (12 V Input).

Co1 = Required Low-ESR Electrolyitic Capacitor; 470 µF (3.3 ± 5 V Input), 940 µF (12 V Input).

Co2 = Ceramic Capacitance for Response to a 3 A (+ 1.5 A) Load Transient; 200 µF (3.3 ± 5 V Input), 400 µF (12 V Input).

Con = Distributed hf-Ceramic Decoupling Capacitors for VTT bus; as Recommended for DDR Memory Applications.

PTH03050Y

PTH05050Y

PTH12050Y

SLTS221A–MARCH 2004–REVISED OCTOBER 2005

MEMORY BUS TERMINATION MODULES

•

50 W/in3 Power Density

•

VTT Bus Termination Output

•

Safety Agency Approvals:

(Output Tracks the System VREF)

UL/cUL60950, EN60950, VDE

•

6 A Output Current (8 A Peak)

•

Point-of-Load Alliance (POLA™) Compatible

•

3.3-V, 5-V or 12-V Input Voltage

•

DDR and QDR Compatible

•

On/Off Inhibit (for VTT Standby)

•

Undervoltage Lockout

•

Operating Temperature: –40°Cto85°C

•

Efficiencies up to 88%

•

Output Overcurrent Protection (Non-Latching,

Auto-Reset)

The PTHxx050Y are a series of ready-to-use switching regulator modules from Texas Instruments designed

specifically for bus termination in DDR and QDR memory applications. Operating from either a 3.3-V, 5-V or 12-V

input, the modules generate a VTT output that will source or sink up to 6 A of current (8 A transient) to accurately

track their VREF input. VTT is the required bus termination supply voltage, and VREF is the reference voltage for

the memory and chipset bus receiver comparators. VREF is usually set to half the VDDQ power supply voltage.

Both the PTHxx050Y series employs an actively switched synchronous rectifier output to provide state-of-the-art

stepdown switching conversion. The products are small in size (0.87 in × 0.5 in), and are an ideal choice where

space, performance, and high efficiency are desired, along with the convenience of a ready-to-use module.

Operating features include an on/off inhibit and output over-current protection (source mode only). The on/off

inhibit feature allows the VTT bus to be turned off to save power in a standby mode of operation.

Package options include both throughhole and surface mount configurations.

STANDARD APPLICATION

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.

POLA is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2005, 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.