A B C D E REVISION HISTORY ECO REV - 4 5 VIN RUN1 ON R74 30.1K 1% 1 6 NOTE: UVL0 = 9V, Typical APPROVED DESCRIPTION PRODUCTION Value Change: R2A, R2B, R30, R26, R13, COUT17, COUT22, C30 & C31. (FSwitch 400kHz to 500kHz) Value Change: R74, R76, Q1, Q2, Q11 & Q12. DATE Mike Shriver 06/22/09 Mike S. 01/11/10 Mike S. 04/14/10 2 C1 1000pF R75 10.0K 1% R60 (Opt) C4 1000pF C2 1uF 25V R77 10.0K 1% R54 (Opt) 56 5 BOOT 54 8 9 10 11 12 13 14 15 16 17 18 19 20 58 VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN 59 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND 0.47uH 744355147 Wurth Electronik R11 2.87K 1% 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 GL VLDRV 3 L1 ISNS2P COMP2 PWM2 FB2 SGND SGND SGND VINSNS 9 16 31 3. DO NOT CONNECT SCOPE GROUND TO E11. VIN 4. USE E3 AND E11 TO MONITOR THE DC VOLTAGE OF VOUT1. ONLY USE A BATTERY POWERED DMM. R18 2.2 C12 1uF 25V C13 1uF 25V X5R 0603 CIN8 22uF 16V CIN7 22uF 16V 5. USE E14 AND E20 TO MONITOR THE DC VOLTAGE OF VOUT2 WITH ANY DMM. 2 R27 (Opt) R29 (Opt) Fswitch = 500kHz typical R30 55 R26 59.0K 1% R25 0 40.2K 1% C17 (Opt) 5 DISBL# VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH DRMDISBL2 56 PWM2 PWM TP2 R32 (Opt) E15 CLKOUT 2 53 R73 0 BOOT 54 Reg5V VCIN 8 9 10 11 12 13 14 15 16 17 18 19 20 R20 (Opt) VCC NC NC C15 0.22uF SW2 R31 2.87K 1% 0.47uH 744355147 Wurth Electronik DRMBIAS2 R51 (Opt) 1. STUFF R16 WITH 0 OHMS. 2. STUFF R49 WITH 0 OHMS. 3. STUFF R20 WITH 0 OHMS. 4. REMOVE 0 OHM RESISTOR AT R25. 5. STUFF C16 WITH 100PF. C18 4.7uF 10V 0805 6. STUFF R60 WITH 0 OHMS. 7. STUFF R57 WITH 0 OHMS. 8. REMOVE REDUNDANT COMPENSATION COMPONENTS. 9. TIE VOUT1 AND VOUT2 SHAPES TOGETHER. R62 1.00K 1% 1. ALL RESISTORS ARE IN OHMS, 0603. 2. ALL CAPACITORS ARE IN MICROFARAD, 0603. BODE PLOT SETUP: B U3 R2J20602NP NOTE: UNLESS OTHERWISE SPECIFIED. 1. FOR VOUT1, APPLY EXCITATION SIGNAL ACROSS R6. 2. FOR VOUT2, APPLY EXCITATION SIGNAL ACROSS R71 AND CHANGE ITS VALUE TO 10 OHMS. A COUT10 100uF 6.3V COUT11 (Opt) 1210 + E20 VO2- COUT7 330uF 2.5V 7343 + COUT8 330uF 2.5V 7343 + J7 VOUT2+ 1.8V / 25A COUT9 330uF 2.5V 7343 J8 VOUT2- VDRIVE VOUT1 MODIFICATIONS FOR SINGLE OUTPUT / DUAL PHASE OPERATION WHERE PHASE 1 = MASTER: E14 VO2+ VOUT2 L2 59 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND GL VLDRV 3 CGND CGND CGND E19 GND 21 40 41 42 43 44 45 46 47 48 49 50 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 R34 (Opt) TP4 52 (Opt) R53 (Opt) 1 6 51 R33 CGND VSWH VCC (Opt) 3 J5 VOUT1- VIN DRMBIAS2 0 C11 (Opt) VCC E28 DRMBIAS J4 VOUT1+ 1.2V / 25A COUT3 + 330uF 2.5V 7343 VOS1- VIN R17 R23 10.0K R28 (Opt) COUT2 + 330uF 2.5V 7343 2. ONLY APPLY LOAD FROM J7 TO J8 ON VOUT2. C14 0.1uF C16 (Opt) R50 COUT5 (Opt) 1210 C10 0.22uF 58 R19 (Opt) COUT1 + 330uF 2.5V 7343 NOTE: 1. ONLY APPLY LOAD FROM J4 TO J5 ON VOUT1. 19 VCC 0 DRMBIAS1 COUT4 100uF 6.3V 20 0 1 R6 10 VOUT1 SW1 21 R71 R24 E12 TRK/SS2 E13 CLKIN R3B 499 1% C3B 2200pF VOUT2 E3 VOS1+ VOS1+ U2 R2J20602NP VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VIN VCC CIN5 180uF 16V 16SVP180MX C9 0.22uF 22 VIN 2 R1B 20K 1% + VOS1E11 PWMEN2 R21 10.0K 7 26 24 RUN1 PWMEN1 17 27 14 32 1 23 IL1M1 RUN2 PGOOD1 PGOOD2 SS1 VCC VSNSP 100pF RBB 10.0K 1% CIN6 180uF 16V (Opt) C5 0.22uF 21 40 41 42 43 44 45 46 47 48 49 50 25 PWMEN2 R16 (Opt) ISNS2N ILIM2 8 33 29 30 6.34K 1% C2B 680pF C8 4.7uF 10V 0805 15 7 ISNS1N VSNSN 18 6 VSNSOUT IAVG VOS1+ ISNS1P 28 5 COMP1 PHSMD VOS1- C1B R2B VCC VDIF1 4 13 R49 (Opt) 100pF 3 CLKOUT R57 (Opt) COMP1 12 6.34K 1% C2A 680pF PWM1 FREQ C1A R2A RBA 20K 1% FB1 10 2 R61 (Opt) + R14 10 PWMEN1 U1 LTC3860EUH COMP1 CIN4 (Opt) 1210 E2 VIN- VDRIVE 1uF CLKIN R3A 499 1% SS2 R1A 20K 1% CIN3 (Opt) 1210 C7 11 R15 (Opt) 57 R13 59.0K 1% VCC C3A 2200pF CGND TP3 0 VCC VSWH C6 0.1uF R12 (Opt) R70 NC NC R52 (Opt) R9 VDIF1 2 53 52 R10 (Opt) PWM TP1 R7 (Opt) VCC R8 (Opt) 0 VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH VSWH PWM1 VOUT2 E8 TRK/SS1 J1 VIN 10V - 14V CIN1 22uF 16V 1210 R72 0 DISBL# (Opt) E5 PGOOD1 E4 PGOOD2 3 4 55 Reg5V R5 VCC R3 100K DRMDISBL1 VCIN DRMDISBL2 GH R2 10.0K VCC R4 100K CIN2 22uF 16V 1210 J2 GND CGND CGND CGND JP2 C3 1uF 25V X5R 7 3 4 E1 VIN+ R1 2.2 DRMBIAS1 R76 30.1K 1% 1 2 OFF VIN GH RUN2 ON VIN VIN 57 4 1 6 51 JP1 4 3 OFF VOUT2 R63 1.00K 1% 1 CUSTOMER NOTICE APPROVALS LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. C D LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY TITLE: SCHEMATIC HIGH CURRENT DUAL OUTPUT/DUAL PHASE SYNCHRONOUS BUCK CONVERTER SIZE C:\ORCADWIN\CAPTURE\1184A\1184A_REV6.DSN THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. TECHNOLOGY RB Mike S. N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 DATE: IC NO. REV. LTC3860EUH DEMO CIRCUIT 1184A Wednesday, April 14, 2010 E SHEET 5 1 OF 2 A B C D E OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 1 D5 CMDSH-3 Q1 RJK0305DPB U4 LTC4449EDCB VDRIVE 5 Q2 RJK0305DPB 4 4 C19 R35 2.2 C21 1uF 7 4.7uF 0805 PW M1 6 5 4 DYNAMIC LOAD CIRCUIT FOR VOUT1 VIN VCC BOOST VLOGIC TG IN TS GND BG 8 1 R64 C20 0 0.22uF 5 CIN9 22uF 16V 1210 4 1 2 3 CIN10 22uF 16V 1210 VOUT1 1 2 3 SW 1 5% DUTY CYLCE MAX. Q6 RJK0330DPB GND 5 COUT13 (Opt) 7343 + COUT14 (Opt) 7343 + COUT15 (Opt) 7343 COUT16 (Opt) 1210 COUT17 100uF 6.3V 1210 VOUT1 C30 4.7uF 10V (Opt) 0805 4 5 4 9 Q4 SUD50N03-12P E21 PULSE GEN1 2 3 + J9 1 2 3 R37 10.0K Q7 RJK0330DPB 4 1 2 3 JP5 ISTEP1 R39 0.010 1% 2010 E22 GND GND PULSED LOAD1 CURRENT 5% DUTY CYCLE MAX. 10mV / A OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 2 D6 VIN DYNAMIC LOAD CIRCUIT FOR VOUT2 CMDSH-3 3 Q11 RJK0305DPB U5 LTC4449EDCB VDRIVE 5 Q12 RJK0305DPB 4 5 CIN11 22uF 16V 1210 4 3 CIN12 22uF 16V 1210 VOUT2 C22 R40 2.2 7 4.7uF C24 1uF 6 0805 PW M2 5 4 VCC BOOST VLOGIC TG IN TS GND BG 8 1 R65 C23 0 0.22uF 1 2 3 SW 2 5% DUTY CYLCE MAX. 2 Q13 RJK0330DPB 3 GND 5 Q14 RJK0330DPB 4 1 2 3 + Q9 SUD50N03-12P E23 PULSE GEN2 5 4 9 J10 1 2 3 R41 10.0K 1 2 3 COUT18 (Opt) 7343 + COUT19 (Opt) 7343 + COUT20 (Opt) 7343 COUT21 (Opt) 1210 COUT22 100uF 6.3V 1210 VOUT2 C31 4.7uF 10V (Opt) 0805 JP6 R44 0.010 1% 2010 E24 GND ISTEP2 GND PULSED LOAD2 CURRENT 5% DUTY CYCLE MAX. 10mV / A 2 2 5V BIAS U6 LT1616ES6 VIN JP3 INT 5V ON 1 5 2 4 3 OFF C26 1uF 2 VIN PWM ENABLE CIRCUIT FOR NON-THREE STATE COMPATIBLE DRMOS D3 BOOST SHDN SW GND FB 1 CMDSH-3 C25 0.22uF 15uH A914BYW-150M D4 B0530W-7-F 3 R45 6.65K 1% JP4 +5V SELECT 1 INT 2 L3 6 R46 20K 1% C27 10uF 10V 0805 3 DRMDISBL1 PW MEN1 R67 EXT (Opt) R66 (Opt) VCC 1 VDRIVE R47 C28 1uF 10 R48 1 E25 VDRIVE DRMDISBL2 PW MEN2 0 C29 1uF R69 E26 GND (Opt) R68 (Opt) CUSTOMER NOTICE 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. APPROVALS PCB DES. APP ENG. Mike S. A B C D LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY TITLE: SCHEMATIC HIGH CURRENT DUAL OUTPUT/DUAL PHASE SYNCHRONOUS BUCK CONVERTER SIZE C:\ORCADWIN\CAPTURE\1184A\1184A_REV6.DSN THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. TECHNOLOGY RB 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 N/A SCALE = NONE DATE: IC NO. REV. LTC3860EUH DEMO CIRCUIT 1184A Wednesday, April 14, 2010 E 6 SHEET 2 OF 2