B JP4 DMAX 3 2 1 1 2 4 U1* 3 CC1 10nF D E ROSC 66.5k CSS 0.1uF RC1* R1 12.4k CC2 220pF R2 475k VOUT CF 0 RF 0 3 3V8 24 SENSE1+ 23 SENSE1- 22 2 SLOPE 3 BLANK 4 PHASEMODE SW1 RUN R10 10 VIN 20 R3* SS INTVCC 19 7 ITH G1 18 8 FB PGND 17 9 SGND G2 16 NC 15 SENSE2- 14 SENSE2+ 13 P10 10 CLKOUT P11 11 SYNC 12 PLLFLTR C3 10nF R11 24.9k FREQ C2 4.7uF +VIN 100uF 63V R5 (Opt.) 6.8uF 50V 6.8uF 50V COUT1,2,3,4,7 CIN1,2,3 GND E3 +VOUT* +48V 3 R8 .005 1W R4 10 E2 E4 R7 (Opt.) CU1 1uF E1 +VIN* COUT5,6 R6 .005 1W Q3* Q4* C4 10nF 1 Q1* Q2* 21 6 +VOUT 4 RUN 5 D1 PDS760 2 C1 1nF DMAX L1 19.4uH PA2050-193 +VIN + 1 OFF ON 75% 84%** 96% 1.66 1.0** 0.625 JP3 SLOPE 3 2 1 JP2 BLANK 3 2 1 3 2 1 JP1 PHASE C **Jumper Open 325ns 250ns** 175ns 180° 120° A D2 PDS760 2 1 L2 19.4uH PA2050-193 E5 GND E6 GND E7 GND E8 GND 2 2 +VIN JP5 U1 Bias 2 4 R9 10k Q5 PZTA42 VIN LTC3862EGN HAT2266H Opt. 84.5k 68k 5 - 36V DC1286A-B LTC3862EGN-1 HAT2279H Opt. 150k 39k 8 - 36V 3 - 5A 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. 2 Optional Bias Circuit LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY A DC1286A-A IOUT (max) 2 - 5A Customer Notice D3 PBZ12B 1 U1 Q2,Q4 Q1,Q3 R3 RC1 +VIN 12V 3 1 1 3 2 1 * ASSEMBLY B C LINEAR TECHNOLOGY CORPORATION 1630 McCarthy Blvd. Milpitas, CA. 95035 Phone : (408) 432-1900 Fax : (408) 434-0507 Title Size 1 LTC3862EGN / LTC3862EGN-1 48V Output Boost Converter Document Number Rev Demo Circuit 1286A-A / B Date: Monday, July 07, 2008 D Sheet of 1 E A 1