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PTH03050YAS-PTH03050YAST
6 A 3.3-V Input Bus Termination Power Module for DDR/QDR Memory
www.ti.com
6-A NON-ISOLATED DDR/QDR
FEATURES
DESCRIPTIONVIN
Standby
GND
VTT
VREF
VDDQ
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.
PTH03050YPTH05050YPTH12050YSLTS221A–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 6A Output Current(8A Peak) •
Point-of-Load Alliance (POLA™) Compatible 3.3-V, 5-Vor 12-V Input Voltage DDR and QDR Compatible On/Off Inhibit (for VTT Standby) Undervoltage Lockout Operating Temperature: –40°Cto85°C Efficiencies upto 88% Output Overcurrent Protection (Non-Latching,Auto-Reset)The PTHxx050Y area seriesof ready-to-use switching regulator modules from Texas Instruments designedspecificallyfor bus terminationin DDR and QDR memory applications. Operating from eithera 3.3-V, 5-Vor 12-Vinput, the modules generatea VTT output that will sourceor sinkupto6Aof current(8A transient)to accuratelytrack their VREF input. VTTis the required bus termination supply voltage, and VREFis the reference voltage forthe memory and chipset bus receiver comparators. VREFis usually setto half the VDDQ power supply voltage.
Both the PTHxx050Y series employsan actively switched synchronous rectifier outputto provide state-of-the-artstepdown switching conversion. The products are smallin size (0.87in× 0.5 in), and arean ideal choice wherespace, performance, and high efficiency are desired, along with the convenienceofa ready-to-use module.
Operating features include an on/off inhibit and output over-current protection (source mode only). The on/offinhibit feature allows the VTT bustobe turnedoffto save powerina standby modeof operation.
Package options include both throughhole and surface mount configurations.
STANDARD APPLICATIONPleasebe aware thatan important notice concerning availability, standard warranty, and usein critical applicationsof Texas
