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LTC3609 Datasheet(PDF) 18 Page - Linear Technology |
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LTC3609 Datasheet(HTML) 18 Page - Linear Technology |
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18 / 24 page  LTC3609 18 3609f APPLICATIONS INFORMATION Figure 6. Design Example: 5V to 32V Input to 2.5V/6A at 550kHz VOUT 2.5V AT 6A GND VIN VIN 5V TO 32V COUT1 100μF x2 L1 1.2μH CIN 4.7μF 50V x2 + LTC3609 SGND 26 NC 25 NC 24 VFB 23 ION 22 NC 21 SGND 20 FCB 19 ITH 18 VRNG 17 PGOOD 16 SGND 15 SGND GND VOUT 1 2 3 4 5 6 7 SW SW SW 8 9 10 11 12 13 14 40 39 38 37 36 35 34 33 INTVCC INTVCC 32 PGOOD 31 VIN 30 29 28 27 SW 41 SW 42 SW 43 SW 44 SW 45 SW 46 SW 47 PVIN 48 PVIN 49 PVIN 50 PVIN 51 PVIN 52 3609 F06 CF 0.1μF 50V RF1 1Ω CVCC 4.7μF 6.3V EXTVCC C4 0.01μF INTVCC INTVCC JP1 CB1 0.22μF DB CMDSH-3 CSS 0.1μF VIN CVON 0.1μF R1 9.53k 1% RPG1 100k RON 187k 1% R2 30.1k 1% R5 15.8k CC1 1000pF CC2 100pF VOUT CIN: MURATA GRM32ER71H475K COUT: MURATA GRM435R60J107M LI: CDEP851R2MC-50 KEEP POWER GROUND AND SIGNAL GROUND SEPARATE. CONNECT AT ONE POINT. 2Ω • Use a compact plane for the switch node (SW) to improve cooling of the MOSFETs and to keep EMI down. • Use planes for VIN and VOUT to maintain good voltage filtering and to keep power losses low. • Flood all unused areas on all layers with copper. Flood- ing with copper reduces the temperature rise of power components. Connect these copper areas to any DC net (VIN, VOUT, GND or to any other DC rail in your system). When laying out a printed circuit board without a ground plane, use the following checklist to ensure proper opera- tion of the controller. These items are also illustrated in Figure 7. • Segregate the signal and power grounds. All small signal components should return to the SGND pin at one point, which is then tied to the PGND pin. • Connect the input capacitor(s) CIN close to the IC. This capacitor carries the MOSFET AC current. • Keep the high dV/dT SW, BOOST and TG nodes away from sensitive small-signal nodes. • Connect the INTVCC decoupling capacitor CVCC closely to the INTVCC and PGND pins. • Connect the top driver boost capacitor CB closely to the BOOST and SW pins. • Connect the VIN pin decoupling capacitor CF closely to the VIN and PGND pins. |
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