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PTH03060YAS Datasheet(PDF) 7 Page - Texas Instruments |
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PTH03060YAS Datasheet(HTML) 7 Page - Texas Instruments |
7 / 19 page www.ti.com APPLICATION INFORMATION Typical DDR Application Diagram Inhibit + + DDRII/ QDRII PTH05010W VDDQ I/O Memory Inhibit + PTH05050Y DDR Termination + 2 × 330 µF 2 × 22 µF 2 × 330 µF 2 × 22 µF +Sense Margin ± Auto-Track VI +VADJ 1 kΩ 1 kΩ VI= 5V 220 µF 47 µF 470 µF 47 µF 5.51 kΩ VO +VREF VI UDG−05096 VTT VTT = 0.9 V VDDQ = 1.8 V CAPACITOR RECOMMENDATIONS FOR THE PTH03060Y AND PTH05060Y DDR POWER Input Capacitor Output Capacitors PTH03060Y PTH05060Y, PTH12060Y SLTS222A–MARCH 2004–REVISED OCTOBER 2005 MODULES (3.3-V/5-V OPTION) The recommended input capacitor(s) is determined by the 330 µF(1) minimum capacitance and 300 mArms minimum ripple current rating. Ripple current and less than 160 mΩ equivalent series resistance (ESR) values are the major considerations, along with temperature, when designing with different types of capacitors. Unlike polymer tantalum, regular tantalum capacitors have a recommended minimum voltage rating of 2 × (maximum DC voltage + AC ripple). This is standard practice to insure reliability. For improved ripple reduction on the input bus, ceramic capacitors may be substituted for electrolytic types using the minimum required capacitance. For applications with load transients (sudden changes in load current), regulator response will benefit from external output capacitance. The recommended output capacitance of 470 µF will allow the module to meet its transient response specification (see Electrical Specifications table). For most applications, a high quality computer-grade aluminum electrolytic capacitor is adequate. These capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz, and are suitable when ambient temperatures are above 0°C. For operation below 0°C tantalum, ceramic or Os-Con type capacitors are recommended. When using one or more non-ceramic capacitors, the calculated equivalent ESR should be no lower than 4 mΩ (7 mΩ using the manufacturer's maximum ESR for a single capacitor). A list of preferred low-ESR type capacitors are identified in Table 1. 7 |
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