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PTH12010Y Datasheet(PDF) 7 Page - Texas Instruments |
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PTH12010Y Datasheet(HTML) 7 Page - Texas Instruments |
7 / 18 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 PTH03010Y AND PTH05010Y DDR POWER Input Capacitor Output Capacitors PTH03010Y PTH05010Y PTH12010Y SLTS223A–MARCH 2004–REVISED OCTOBER 2005 MODULES (3.3-V/5-V OPTION) The recommended input capacitor(s) is determined by the 470 µF minimum capacitance and 500 mArms minimum ripple current rating. Ripple current, less than 160 mΩ equivalent series resistance (ESR), and temperature are the major considerations when selecting input 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 ensure reliability. For improved ripple reduction on the input bus, ceramic capacitors may used to complement electrolytic types to achieve the minimum required capacitance. For applications with load transients (sudden changes in load current), regulator response benefits from external output capacitance. The recommended output capacitance of 470 µF will allow the modue to meet its transieint 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 for ambient temperatures above 0°C. Below 0°C, tantalum, ceramic or Os-Con type capacitors are recommended. When using one or more nonceramic 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. In addition to electrolytic capacitance, adding a 10-µF to 22-µF X5R/X7R ceramic capacitor to the output reduces the output ripple voltage and improve the regulator’s transient response. The measurement of both the output ripple and transient response is also best achieved across a 10-µF ceramic capacitor. 7 |
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