5 4 E1 VDD33 E2 E4 3 VDD25 GND 2 1 REVISION HISTORY INTVCC/EXTVCC GND ECO C13 150uF 35V 2 2 5 Q5 MMBT3906LT C14 10nF Q6 MMBT3906LT 14 RUN ASEL 16 23 WP 3 JP1 WP ON 15 SC 2 R5 10K 1 OFF 24 FREQ_CFG R42 10K 17 VOUT_CFG 18 19 VDD33 VTRIM_CFG 20 TSNS1 VSENSE0- TSNS0 RUN0 TG1 ASEL BOOST1 WP SW1 SC BG1 ISNS1+ FREQ_CFG ISNS1- VOUT0_CFG VSENSE1 VOUT1_CFG VTRIM0_CFG R32 OPT R73 OPT R24 15.8K R23 OPT R22 OPT R20 OPT GPIO1 VTRIM1_CFG GPIO0 5 1 2 3 36 BG0 6 ISNS0+ 2. INSTALL SHUNTS AS SHOWN. D3L OPT * * ISNS0- R25 0 C38 1 E8 VIN 2 TG1 R56 0 31 29 SW1 32 BG1 3 ISNS1+ 4 ISNS1- Q1 4 Q2 BSC011N03LSI 4 OPT Q9 27 L1 R10 * * R1 4 C C27 10uF Q7 OPT 4 C1 100nF GND_SNS C18 10uF R7 * * 2512 + R30 C32 C24 OPT 100uF 1210 * R6 * + C11 C20 100uF 330uF 1210 D3L + C30 330uF D3L + C45 D3L OPT C44 D3L OPT R11 R45 10K 13 * C21 * 12 R12 * VDD33 C4 * R44 10K B GPIO0B CURRENT SENSE CONNECTIONS ASSY FSW R SENSE R1,R2 350KHz OPT -B VERSION DCR SENSE 425KHz 1.4K R7,R15 R6,R29 R30,R34 R10,R16 R11,R13 R12,R14 C21,C22 C4,C38 L1,L2 OPT 1nF OPEN 0.4uH 0 0 0.002 100 100 0 OPT OPT 0 1.4K 0 3 0.22uF 1.0 uF 0.56uH 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. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 D3L OPT VOUT R8 ADJ., MAX 40A 0 E7 GND TECHNOLOGY HZ YI S. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC CONVERTER WITH DIGITAL POWER MANAGEMENT SIZE 5 330uF D3L + C42 J4 CUSTOMER NOTICE 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. * 330uF D3L + C43 VOUT_SNS SGND AND PGND CONNECTED AT A SINGLE NODE NEAR U1 NOTE: UNLESS OTHERWISE SPECIFIED * + C29 R14 VSENSE0+ -A VERSION A R29 + C10 1 2 3 * * SGND 5 1 2 3 SW0 GPIO1B E11 C34 C25 C23 100uF 100uF R34 OPT 1210 1210 1210 * C22 39 30 * R2 2512 J3 R13 VSENSE0- 41 R18 OPT TG0 37 7 R15 4 * RUN1 B R17 10K 25 22 VSENSE0+ GND VDD25 21 ISNS0- ITH0 * 5 40 TSNS0 C12 10nF 28 ISNS0+ ITH1 * 1 2 3 C PLACE Q5,Q6 NEAR L1,L2. RESPECTIVELY BG0 R16 5 5 TSNS1 ALERT LTC3880EUJ VOUT L2 1 2 3 26 ITH SW0 U4 38 Q10 OPT 5 ALERTB TG0 BOOST0 4 51 2 3 11 SYNC 4 1 2 3 8 SYNC SDA 100nF BOOST1 SDA R3 4.87K SCL VDD33 10 VDD25 9 SCL C2 BSC011N03LSI Q4 4 PGND C16 100pF BOOST0 D C28 10uF C48 10uF 34 C8 4.7nF C15 100pF 35 R41 R57 R40 R39 10K 10K 10K 10K 33 R48 0 ITH_TP INTVCC ITH C9 C3 1uF 1uF VIN E9 R59 0 VDD33 E3 3-28-12 Q8 OPT 1 2 3 GND DATE YI S. C19 10uF BSC050N03LS Q3 VDD33 APPROVED VIN BSC050N03LS J2 GND C17 0.22uF DESCRIPTION PRODUCTION EXTVCC_DRV D1 CMDSH-3TR 1 + C6 D2 100nF CMDSH-3TR 1 5 VDD25 R52 2 VIN 6.5V - 24V R60 OPT INTVCC C5 4.7uF 0805 REV __ E10 VIN J1 D E6 1 VIN E5 N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3880EUJ DEMO CIRCUIT 1753A 1 Monday, May 07, 2012 SHEET 1 1 OF 3 A 5 4 3 2 1 ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN 3V3 E13 E12 J9 V+ 1 3.3V or 5V2 GND 3 SCK/SCL45 MISO 6 CS MOSI/SDA7 GND 8 EESDA 9 EEVCC 10 EESCL 11 EEGND 12 GND 13 GPIO_1 14 ALERTB SCL SDA SDA E15 SCL E16 E17 JP5 3 D E25 GPIO1B C NC GPIO0-GPIO1 R79 0 SYNC GPIO1B 1 GPIO0B E19 GPIO0B E20 R80 0 RUN RUN 1 2 3 4 5 6 7 8 9 10 11 12 TO DC1613A R31 OPT R33 OPT R51 0 3V3 R58 OPT SHARE_CLK FAULT4 FAULT2 FAULT3 FAULT1 SYNC_C 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 +3.3V VIN_SNS GND VIN_EN SCL ALERTB SDA CONTROL0 SPARE1 SPARE2 WDI/RESETB CONTROL1 SPARE3 SHARE_CLK FAULT4 FAULT2 FAULT3 FAULT1 SPARE4 GND J7 DEMO HEADER (F) VDD33 R27 10K SW1 RUN 4 1 1 +3.3V 2 VIN_SNS 3 GND 4 VIN_EN 5 SCL 6 ALERTB 7 SDA 8 CONTROL0 9 SPARE1 10 SPARE2 11 WDI/RESETB 12 CONTROL1 13 SPARE3 14 SHARE_CLK 15 FAULT4 16 FAULT2 17 FAULT3 18 FAULT1 19 SPARE4 20 GND J8 DEMO HEADER (M) C AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA SYNC SC TO DC1427A (OPT) J10 SC R77 0 E14 ON 5 OFF 6 3 D ALERTB 2 AUXP 2 C R63 10 C26 10nF E22 SGND E21 GND C31 100nF B B R35 4.99K U5 1 2 3 4 A0 VCC A1 WP A2 SCL VSS SDA 24LC025-I/ST 8 AUXVCC 7 EEWP 6 EESCL 5 EESDA R36 4.99K R37 4.99K R70 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS TECHNOLOGY PCB DES. HZ APP ENG. YI S. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC CONVERTER WITH DIGITAL POWER MANAGEMENT SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3880EUJ DEMO CIRCUIT 1753A 1 Monday, May 07, 2012 SHEET 2 1 OF 3 A 5 4 3 2 1 ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN +3.3V D +3.3V C41 0.22uF 0805 TP0101K Q14 1 3 Q12 2N7002A 1 GPIO0B R55 127 2 R68 0.01 D5 ALERTB RED 2 IOUT TST NOTE: PULSE OUT 10mV / AMP E24 GND R65 30 1W 2512 OPT E27 1 2 3 R62 10K DO NOT EXCEED 5% DUTY CYCLE! 1 ALERTB D3 GREEN GPIO0B 2 4 PULSE IN VOUT 2 3 4 5 E23 5 Q15 RJK0305DPB R53 200 VOUT 3 J11 R38 49.9 1 1 DYNAMIC LOAD CIRCUIT D 2 VOUT C C VIN R50 1.5K 2 5 6 1 ON OFF 7 8 C37 1uF 1206 4 NC GND VIN 3 GND 2 GND SENSE/ADJ +3.3V JP4 EXTVCC_DRV 1 VIN OUTPUT LT1129CS8-3.3 C35 10uF 1206 ON 2 OFF 1 + C36 3.3uF 3528 U6 SHDN 3 3 JP3 LED R61 1.5K 5 U7 SHDN 6 7 8 B C40 1uF 1206 3V3 GND SENSE/ADJ VIN OUTPUT LT1129CS8-5 3 C49 4.7uF 2 1 EXTVCC_DRV B 2 1 VIN GND 4 VDD33 Q11 TP0101K 3 GND NC R66 10K R64 10K 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. A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 APPROVALS TECHNOLOGY PCB DES. HZ APP ENG. YI S. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only TITLE: SCHEMATIC DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC CONVERTER WITH DIGITAL POWER MANAGEMENT SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3880EUJ DEMO CIRCUIT 1753A 1 Monday, May 07, 2012 SHEET 3 1 OF 3 A