A NOTES: B C D E UNLESS OTHERWISE SPECIFIED EXTVCC R1 10 TP1 VBIAS ( < 7V ) VBIAS 4 TP2 D1 MMDL770T1 2 1 VIN VIN C6 1uF 16V C12 100pF C22 (Opt.) C47 0.1uF 100V RUN TP9 VIN C48 47pF 2 C26 1000pF 1 2 JP1 FCB 3 CCM DCM R15 10K R8 8.25K 1% C23 (Opt.) D5 MMBZ5230B 4.7V R10 15K R12 220K +6V R17 (Opt.) 1 PGOOD 2 SS 3 SENSE+ 4 SENSE- 5 ITH BOOST1 TG1 23 SW1 22 VIN 21 EXTVCC 20 INTVCC 19 6 VOSENSE 7 SGND BG1 18 8 RUN PGND 17 9 FCB BG2 16 10 PLLFLTR SW2 15 11 PLLIN TG2 14 12 STBYMD BOOST2 13 R16 8.87K C29 (Opt.) C30 (Opt.) R18 2.67K C7 0.22uF 16V TS2 GND GND VOS+ TG1 VOS+ VOUT +6V C25 10uF 10V C24 1uF 16V C21 0.1uF 16V L1 10uH R9 0 BG1A R31 TS1 R14 20 BG2A CDEP147-100MC-125 R11 0 C27 0.1uF 16V 36V-72V TP4 +6V 4 C13 C17 C14 C18 C15 C19 C16 COUT1 2.2uF + 220uF 100V 63V 3 R7 487K 1% VOS+ C10 68pF R6 100 4 VIN J1 J2 C2-C5 2.2uF 4x 2 SENSE- R5 220K C9 SW1 (Opt.) 24 TS CIN2 + (Opt.) R4 10 COUT2 + 220uF 63V C20 2.2uF 100V C42 C43 C44 C45 C46 (Opt.) VOUT J3 +48V/6A max GND J4 C14-C21 2.2uF 7x D4 PDS560 3 TP7 VOS- D3 PDS560 TP8 5 6 7 8 C11 1000pF R3 100 INP CIN1 + 100uF 100V Q2 Si7852DP D6 B1100 Q3 Si7852DP 4 0 1 D7 1N4148W 2 C28 3300pF SENSE+ SENSESYNC 2 1 2 3 3 U2 LTC3780EG SENSE+ 3 3 TP6 C8 0.022uF TG Q1 Si7852DP 2 1 SS GND 5 1 TP5 D2 1N5819HW (Opt.) 2 1 4 2 C2 C3 C4 C5 2.2uF 100V C1 2.2uF 100V 5 6 7 8 +6V BOOST TG2A 1 2 3 R2 10K PGOOD VCC R13 0 6 5 6 7 8 U1 LTC4440ES6 1 TP3 1 2 3 VBIAS 4 10V-12V RSEN R32 10 RS1 0.025 1W R33 10 RS2 0.025 1W TP10 STBYMD C41 0.1uF 16V TP11 SGND TP12 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 1 Customer Notice Maximum Load at TA=25c Cooling Condition No Fan 150 LFM Fan A B Linear Technology Has Made A Best Effort To Design A Circuit That Meets Customer-Supplied Specifications; However, It Remains The Customer's Responsibility To Verify Proper And Reliable Operation In The Actual Application. Component Substitution And Printed Circuit Board Layout May Significantly Affect Circuit Performance Or Reliability. Contact Linear Technology Applications Engineering For Assistance. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. Maximum Io 5A 6A C D LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 408-432-1900 408-434-0507 FAX Title High Efficiency 48V Buck-Boost DC/DC Converter Size Date: Document Number Demo Circuit 1046A LTC3780EG, LTC4440ES6 Wednesday, August 23, 2006 Sheet E 1 of 2 Rev A 1 R23 0 (Opt.) C35 3300pF SW1 (Opt.) 2 C32 0.1uF 16V (Opt.) R25 10 (Opt.) 3 TS1 1 VCC BOOST 6 2 GND 5 INP TG 4 TS 12V D10 BAS516 2 R24 22K C36 1000pF R20 1K 2 1 1 ITH/RUN C33 1uF 100V Q6 Si7852DP (Opt.) TG1A 4 6 3 2 GND VCC 5 R28 5.6K 1% 3 VFB SENSE 4 3 R30 0.2 1206 Q7 Si7852DP (Opt.) 4 Q8 Si7852DP (Opt.) C40 2.2uF 100V 2 5 6 7 8 5 6 7 8 BG1A Q9 Si7852DP (Opt.) 4 Q10 Si7852DP (Opt.) 1 2 3 RSEN 1 2 3 4 Customer Notice B 4 TS1 BG2A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 8 4 Q4 FDC2512 NGATE 5 6 7 8 5 6 7 8 C39 2.2uF 100V TS2 1 5 1 1 2 3 2 7 VOUT 1 2 3 4 2 VIN C38 1uF 16V TG2A T1 PA0648 2 R21 220K R29 (Opt.) Optional Power Components (Do Not Stuff) 1 U4 LTC3803ES6 C37 100pF R27 1K VIN A VBIAS C31 10uF 16V D8 BAS516 R22 14K C34 0.1uF 16V (Opt.) Q5 MMBT3904 (Opt.) 1 R26 2 (Opt.) 1 U3 (Opt.) LTC4440ES6 3 VBIAS Optional Bias Supply (Stuff) 5 6 7 8 TG1 VBIAS R35 0 (Opt.) R19 (Opt.) D9 MMDL770T1 (Opt.) E 1 2 5 6 TG1A D 1 2 3 Optional Top Driver For TG1 (Do Not Stuff) C 3 4 B 4 A Linear Technology Has Made A Best Effort To Design A Circuit That Meets Customer-Supplied Specifications; However, It Remains The Customer's Responsibility To Verify Proper And Reliable Operation In The Actual Application. Component Substitution And Printed Circuit Board Layout May Significantly Affect Circuit Performance Or Reliability. Contact Linear Technology Applications Engineering For Assistance. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. C LINEAR TECHNOLOGY CORPORATION 1630 McCARTHY BLVD. MILPITAS, CA. 95035 408-432-1900 408-434-0507 FAX Title 1 High Efficiency 48V Buck-Boost DC/DC Converter Size Date: Document Number Demo Circuit 1046A Wednesday, August 23, 2006 D LTC3780EG,LTC4440ES6 Sheet 2 E of 2 Rev A