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LTM4616 Datasheet(PDF) 13 Page - Linear Technology |
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LTM4616 Datasheet(HTML) 13 Page - Linear Technology |
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13 / 24 page  LTM4616 13 4616fa APPLICATIONS INFORMATION Figure 2. 6-Phase Operation Figure 3. 12-Phase Operation 4616 F02 0 +120 PHASE 1 CLKOUT CLKIN PHMODE 120 PHASE 3 CLKOUT CLKIN PHMODE 240 +180 +120 PHASE 5 CLKOUT CLKIN PHMODE SVIN (420) 60 PHASE 2 CLKOUT CLKIN PHMODE +120 180 PHASE 4 CLKOUT CLKIN PHMODE +120 300 PHASE 6 CLKOUT CLKIN PHMODE 0 +90 PHASE 1 4616 F03 CLKOUT CLKIN PHMODE 90 PHASE 4 CLKOUT CLKIN PHMODE 240 +90 PHASE 9 CLKOUT CLKIN PHMODE 330 PHASE 12 CLKOUT CLKIN PHMODE 180 +90 +90 PHASE 7 CLKOUT CLKIN PHMODE 270 PHASE 10 CLKOUT CLKIN PHMODE +120 +90 (390) 30 PHASE 2 CLKOUT CLKIN PHMODE 120 +90 PHASE 5 CLKOUT CLKIN PHMODE 210 PHASE 8 CLKOUT CLKIN PHMODE 300 +120 +90 PHASE 11 CLKOUT CLKIN PHMODE (420) 60 PHASE 3 CLKOUT CLKIN PHMODE +90 +90 150 PHASE 6 CLKOUT CLKIN PHMODE current sharing. This will balance the thermals on the design. Tie the ITH pins of each LTM4616 together to share the current evenly. To reduce ground potential noise, tie the ITHM pins of all LTM4616s together and then connect to the SGND of the master at the point it connects to the output capacitor GND. See layout guideline in Figure 17. Figure 19 shows a schematic of the parallel design. The FB pins of the parallel module are tied together. Input RMS Ripple Current Cancellation Application Note 77 provides a detailed explanation of multiphase operation. The input RMS ripple current can- cellation mathematical derivations are presented, and a graph is displayed representing the RMS ripple current reduction as a function of the number of interleaved phases. Figure 4 shows this graph. Spread Spectrum Operation Switching regulators can be particularly troublesome where electromagnetic interference (EMI) is concerned. Switching regulators operate on a cycle-by-cycle basis to transfer power to an output. In most cases, the frequency of operation is fixed based on the output load. This method of conversion creates large components of noise at the frequency of operation (fundamental) and multiples of the operating frequency (harmonics). To reduce this noise, the LTM4616 can run in spread spectrum operation by tying the CLKIN pin to SVIN. In spread spectrum operation, the LTM4616’s internal oscillator is designed to produce a clock pulse whose period is random on a cycle-by-cycle basis but fixed |
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