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LTM4660 Datasheet(PDF) 22 Page - Analog Devices |
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LTM4660 Datasheet(HTML) 22 Page - Analog Devices |
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22 / 28 page  LTM4660 22 Rev. 0 For more information www.analog.com APPLICATIONS INFORMATION Table 1. Bulk and Ceramic Capacitor Manufacturers CIN (BULK) COUT (BULK) VENDORS VALUE PART NUMBER VENDORS VALUE PART NUMBER Panasonic 33μF, 80V EEHZA1K330 Panasonic 150μF, 16V 16SVPC150 CIN (CERAMIC) CFLY, CMID VENDORS VALUE PART NUMBER VENDORS VALUE PART NUMBER Murata 2.2μF, 100V, 1210, X7R GRM32DR72A225KA12 Murata 10μF, 100V, 1210, X7S GRM32EC72A106KE05 TDK 2.2μF, 100V, 1210, X7R C3225X7R2A225K230AB TDK 10μF, 100V, 1210, X7R C3225X7R2A106K250AC COUT (CERAMIC) Murata 10μF, 50V, 1210, X7S GCM32EC71H106KA03 VENDORS VALUE PART NUMBER TDK 10μF, 50V, 1210, X7R C3225X5R1H106K250AB Murata 10μF, 25V, 1210, X7S GCM32EC7YA106KA03 TDK 10μF, 25V, 1210, X7R C3225X7R1E106K250AC Table 2. Component Selection Table for Typical LTM4660 Applications VIN (V) VOUT (V) IOUT = 25A CIN (BULK) (μF) CIN (CERAMIC) (μF) COUT (BULK) (μF) COUT (CERAMIC) (μF) CFLY (μF) CMID (μF) RVFB (kΩ) RFREQ (kΩ) RHYS_PRGM (kΩ) TIMER (μF) 48 12 33 10 150 ×2 10 ×3 10 ×10 10 ×10 4.32 49.9 100 1 54 12 22 10 150 ×2 10 ×3 10 ×12 10 ×12 4.32 49.9 100 1 48 5 33 10 100 ×2 10 ×2 10 ×12 10 ×12 11.49 39.9 100 1 54 9 22 10 100 ×2 10 ×2 10 ×10 10 ×10 5.92 43.2 100 1 Safety Considerations The LTM4660 does not provide galvanic isolation between the input and output. There is no internal fuse. If required, a slow blow fuse with a rating of twice the maximum input current needs to be provided to protect each unit from catastrophic failure. The device does support over current protection. The temperature diode along with TEMP pin can be used to detect the need for thermal shutdown that can be done by controlling the RUN pin. BGA pinout of LTM4660 is such that high voltage pins (VIN and C+) have a clearance of one BGA ball from adjacent lower voltage pins. Power Derating Derating curves in Figure 15 to Figure 20 can be used to calculate approximate values of θJA thermal resistance with various airflow conditions. Radiated EMI Noise Potential for EM interference (EMI) is inherent to all switching regulators. Fast switching turn-on and turn- off of the power MOSFETs—necessary for achieving high efficiency—create high frequency (~30MHz +) di/dt changes within DC/DC converters. This activity tends to be the dominant source of high frequency EMI radiation in such systems. The high level of device integration within LTM4660 along with soft switching of power MOSFETs delivers low radiated EMI noise performance. EMI graph in the Typical Performance Characteristics section shows an example of LTM4660 meeting radiation emission limits established by CISPR22 Class B. |
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