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DM504 Datasheet(PDF) 187 Page - Texas Instruments |
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DM504 Datasheet(HTML) 187 Page - Texas Instruments |
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187 / 211 page  187 DM504 www.ti.com SPRS977A – NOVEMBER 2016 – REVISED JANUARY 2017 Submit Documentation Feedback Applications, Implementation, and Layout Copyright © 2016–2017, Texas Instruments Incorporated Table 7-1. Commercial Applications Recommended Decoupling Capacitors Characteristics(1)(2)(3) (continued) Value Voltage [V] Package Stability Dielectric Capacitan ce Tolerance Temp Range [°C] Temp Sensitivity [%] REFERENCE 470nF 6,3 0201 Class 2 X5R - / + 20% -55 to + 85 - / + 15 GRM033R60G474ME90 220nF 6,3 0201 Class 2 X5R - / + 20% -55 to + 85 - / + 15 GRM033R60J224ME90 100nF 6,3 0201 Class 2 X5R - / + 20% -55 to + 85 - / + 15 GRM033R60J104ME19 (1) Minimum value for each PCB capacitor: 100 nF. (2) Among the different capacitors, 470 nF is recommended (not required) to filter at 5-MHz to 10-MHz frequency range. (3) In comparison with the EIA Class 1 dielectrics, Class 2 dielectric capacitors tend to have severe temperature drift, high dependence of capacitance on applied voltage, high voltage coefficient of dissipation factor, high frequency coefficient of dissipation, and problems with aging due to gradual change of crystal structure. Aging causes gradual exponential loss of capacitance and decrease of dissipation factor. Recommended power supply decoupling capacitors main characteristics for automotive products are shown in table below: Table 7-2. Automotive Applications Recommended Decoupling Capacitors Characteristics (1)(2) Value Voltage [V] Package Stability Dielectric Capacitanc e Tolerance Temp Range [°C] Temp Sensitivity [%] REFERENCE 22µF 6,3 1206 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM31CR70J226ME23 10µF 6,3 0805 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM21BR70J106ME22 4.7µF 10 0805 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM21BC71A475MA73 2.2µF 6,3 0603 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM188R70J225ME22 1µF 16 0603 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM188R71C105MA64 470nF 16 0603 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM188R71C474MA55 220nF 25 0603 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM188L81C224MA37 100nF 16 0402 Class 2 X7R - / + 20% -55 to + 125 - / + 15 GCM155R71C104MA55 (1) Minimum value for each PCB capacitor: 100 nF. (2) Among the different capacitors, 470 nF is recommended (not required) to filter at 5-MHz to 10-MHz frequency range. 7.3.3 Static PDN Analysis One power net parameter derived from a PCB’s PDN static analysis is the Effective Resistance (Reff). This is the total PCB power net routing resistance that is the sum of all the individual power net segments used to deliver a supply voltage to the point of load and includes any series resistive elements (i.e. current sensing resistor) that may be installed between the PMIC outputs and Processor inputs. 7.3.4 Dynamic PDN Analysis Three power net parameters derived from a PCB’s PDN dynamic analysis are the Loop Inductance (LL), Impedance (Z) and PCB Frequency of Interest (Fpcb). • LL values shown are the recommended max PCB trace inductance between a decoupling capacitor’s power supply and ground reference terminals when viewed from the decoupling capacitor with a "theoretical shorted” applied across the Processor’s supply inputs to ground reference. • Z values shown are the recommended max PCB trace impedances allowed between Fpmic up to Fpcb frequency range that limits transient noise drops to no more than 5% of min supply voltage during max transient current events. • Fpcb (Frequency of Interest) is defined to be a power rail’s max frequency after which adding a reasonable number of decoupling capacitors no longer significantly reduces the power rail impedance below the desired impedance target (Zt2). This is due to the dominance of the PCB’s parasitic planar spreading and internal package inductances. |
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