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LTC3608 Datasheet(PDF) 18 Page - Linear Technology |
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LTC3608 Datasheet(HTML) 18 Page - Linear Technology |
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18 / 24 page  LTC3608 18 3608fa Figure 6. Design Example: 5V to 18V Input to 2.5V/8A at 550kHz APPLICATIONS INFORMATION • 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. EXTVCC C4 0.01μF CIN: TAIYO YUDEN GMK325BJ106MM-B COUT: TDKC2012X5ROJ226M L1: CDEP85NP-R80MC-50 C5: MURATA GRM31CR60J226KE19 KEEP POWER GROUND AND SIGNAL GROUND SEPARATE. CONNECT AT ONE POINT. 3608 F06 VOUT 2.5V AT 8A GND COUT1 100μF ×2 C5 22μF 6.3V L1 0.8μH GND VIN VIN 5V TO 18V CIN 10μF 35V 3× C6 10μF 35V + (OPTIONAL) + (OPTIONAL) SW SW INTVCC CB1 0.22μF DB CMDSH-3 VIN CSS 0.1μF RSS1 510k PGND SGND R3 0Ω (OPTIONAL) SW INTVCC CVCC 4.7μF 6.3V VIN CF 0.47μF 25V RF1 1Ω R5 11.3k CC1 1500pF CON 0.01μF VIN (OPTIONAL) RON 187k 1% VOUT C2 C1 (OPTIONAL) R1 9.5k 1% R2 30.1k 1% (OPTIONAL) INTVCC C3 (OPTIONAL) RPG1 100k CC2 100pF LTC3608 SGND 26 NC 25 NC 24 VFB 23 ION 22 NC 21 SGND 20 FCB 19 ITH 18 VRNG 17 PGOOD 16 SGND 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 40 39 38 37 36 35 34 33 32 31 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 SGND VOUT RVON 0Ω 0.1μF = SGND = PGND |
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