5 4 3 2 1 REVISION HISTORY TP9 VDD33 TP17 VDD25 GND TP23 INTVCC/EXTVCC TP7 VIN VDD25 VIN C13 150uF 35V C17 0.22uF DESCRIPTION 1 OPT APPROVED PRODUCTION DATE YI S. 1-24-11 2 EXTVCC_DRV C6 100nF D2 D1 VIN 1 + TP37 R60 1 R52 2 C5 4.7uF REV __ INTVCC TP36 6.5V - 24V ECO TP26 2 VIN TP25 D GND 5 Q3 RJK0305DPB C19 10uF C28 10uF D Q8 (OPT) 5 GND VDD33 GND TP29 R59 0 C14 10nF Q6 15 RUN1 14 16 ASEL 23 WP SC 24 ON BG0 ISNS0+ ITH1 ISNS0ITH0 VSENSE0+ TSNS1 VSENSE0- TG1 ASEL BOOST1 WP SW1 SC BG1 R42 10.0K 10.0K VOUT0_CFG VOUT1_CFG VDD33 17 18 19 B 21 FREQ_CFG ISNS1VOUT0_CFG VSENSE1 36 BG0 6 ISNS0+ 7 ISNS0- 1 2 3 5 * VTRIM0_CFG GPIO1 VTRIM1_CFG GPIO0 + C10 330uF D3L 4V R14 * * GND_SNS C VIN 2 Q1 RJK0305DPB C18 10uF C27 10uF TP40 4 GND Q7 (OPT) 4 TP20 GND VOUT1 TG1 R56 0 31 29 GND R25 0 TP16 1 30 TP39 C42 + 330uF D3L OPT 4V C43 + 330uF D3L OPT 4V + C29 330uF D3L 4V C38 VSENSE0+ C1 RJK0330DPB Q2 SW1 32 BG1 3 ISNS1+ 4 ISNS1- L1 100nF 4 VOUT1 2512 * ADJ., MAX 20A R30 R1 4 TP41 R10 * Q9 (OPT) R7 * 27 * C32 100uF * R6 C24 100uF C20 100uF OPT * R9 0 TP3 R11 VOUT1_CFG * C21 13 * 12 VOUT1_SNS R12 + C11 330uF D3L 6.3V * C4 GND VDD25 VTRIM1_CFG VTRIM0_CFG 20 ISNS1+ VOUT0_SNS 1 2 3 1 2 3 SW0 + C30 330uF D3L 6.3V C45 + 330uF D3L OPT 6.3V C44 + 330uF D3L OPT 6.3V B * PGND R5 FREQ_CFG * C22 39 RUN1 RUN0 TP4 * 37 TSNS0 2 1 1 2 3 25 LTC3880EUJ R8 0 R13 VSENSE0- RUN0 3 ALERT R34 * ADJ., MAX 20A C23 100uF OPT 5 40 TSNS0 U4 SW0 TG0 R29 1 2 3 C12 10nF 28 BOOST0 SYNC 38 5 PLACE Q5,Q6 NEAR L1,L2. RESPECTIVELY TG0 C25 100uF C34 100uF 1 2 3 5 ITH0 C * 5 26 * R2 1 2 3 11 ALERTB SDA 4 1 2 3 * 8 SCL VOUT0 2512 * R15 4 TP38 R16 * Q10 (OPT) 5 10 SYNC ITH1 OFF VOUT0 BOOST1 9 SCL SDA R4 4.87K * JP1 WP 4 100nF 5 R40 R39 10.0K 10.0K 35 C7 4.7nF C15 100pF R3 4.87K Q5 10uF C2 Q4 RJK0330DPB VIN C8 4.7nF TSNS1 1.0uF 1.0uF 4 BOOST0 R69 OPT R41 R57 10.0K 10K C16 100pF C48 VDD33 R48 0 22 ITH0_TP ITH0 C3 VDD25 TP2 C9 L2 33 ITH1_TP ITH1 VDD33 R47 0 INTVCC TP1 * R32 24.9K R67 24.9K R73 OPT R74 OPT 34 R18 41 VDD33 R17 10K R43 10K R44 10K CURRENT SENSE CONNECTIONS R24 23.2K R23 * R22 11.3K R21 11.3K R20 0 R19 0 * SGND AND PGND CONNECTED AT A SINGLE NODE NEAR U1 GPIO0B GPIO1B R1,R2 R7,R15 R6,R29 "A" VERSION "R SENSE" OPT OPT 0 "B" VERSION "DCR SENSE" 1.4K 0 CONFIGURATION OPT R30,R34 R10,R16 0 OPT R11,R13 R12,R14 C21,C22 C4,C38 R3,R4 R18 0.002 100 100 1nF OPT 4.87K OPT OPT 0.4uH 0 0 1.4K 0.22uF 1.0 uF 4.87K 16.2K 17.4K 0.56uH R23 L1,L2 NOTE: FSW = 350 KHz FOR "A" VERSION FSW = 425 KHz FOR "B" VERSION SGND TP10 NOTE: UNLESS OTHERWISE SPECIFIED A 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. 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. 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 DIGITALLY PROGRAMMABLE DUAL STEP-DOWN DC/DC SUPPLY SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3880EUJ FAMILY 1 DEMO CIRCUIT 1590B Wednesday, December 07, 2011 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 TP11 GPIO1B J9 ALERTB SDA TP28 TP24 V+ 1 3.3V or 5V 2 GND 3 SCK/SCL 4 MISO 5 CS 6 MOSI/SDA 7 GND 8 EESDA 9 EEVCC 10 EESCL 11 EEGND 12 GND 13 GPIO_1 14 ALERTB SCL TP6 SCL TP19 TP27 3 D R84 OPT 1 C NC GPIO0-GPIO1 R79 0 GPIO0B TP12 R82 OPT. SC GPIO0B TP14 RUN0 VSENSE0R80 0 1 2 3 4 5 6 7 8 9 10 11 12 R51 0 SHARE_CLK FAULT2 FAULT3 FAULT1 SYNC_C J8 DEMO HEADER (M) TO DC1613A R31 OPT R33 OPT R81 R58 OPT 0 NC 1 RUN1 TP13 RUN1 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 VDD33 VDD33 R28 10K SW2 RUN1 C SW1 RUN0 R64 10 ON 5 R27 10K 2 R63 10 4 1 J10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 R26 OPT 0 R49 OPT 0 C 3 RUN0-RUN1 ON 5 2 OFF C33 10nF OFF 6 3 +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 JP2 4 1 +3.3V RUN0 2 VSENSE0+ (OPT) AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA GPIO1B SYNC TO DC590B C SYNC JP5 TP5 SDA SC 6 3 D AUXP R77 0 2 +3.3V C26 10nF J7 DEMO HEADER (F) TP30 SGND TP8 SGND C31 100nF B B R35 4.99K U5 1 2 3 4 A0 VCC A1 WP A2 SCL VSS SDA 8 AUXVCC 7 EEWP 6 EESCL 5 EESDA R36 4.99K R37 4.99K 24LC025-I/ST 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 DIGITALLY PROGRAMMABLE DUAL STEP-DOWN DC/DC SUPPLY SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3880EUJ FAMILY 1 DEMO CIRCUIT 1590B Wednesday, December 07, 2011 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 D D VOUT0 2 VOUT0 D3 GREEN 3 3 GREEN 3 TP31 TP33 D5 IOUT0 TST GND 1 GPIO0B NOTE: PULSE OUT 10mV / AMP 1 GPIO1B 2N7002A ALERTB RED 2N7002A R55 127 2 R68 0.01 Q13 Q12 2 R62 10K 1 2 3 DO NOT EXCEED 5% DUTY CYCLE! TP0101K Q14 GPIO1 D4 GPIO0 4 1 ALERTB 2 3 4 5 C41 0.22uF R54 200 R53 200 5 Q15 RJK0305DPB TP18 +3.3V J11 1 PULSE0 IN +3.3V +3.3V DYNAMIC LOAD CIRCUIT 0 C C VIN DYNAMIC LOAD CIRCUIT 1 VOUT1 J12 C47 0.22uF Q16 RJK0305DPB TP32 3 JP3 +3.3 V TEST VOUT1 5 6 1 R72 10K 1 2 3 DO NOT EXCEED 5% DUTY CYCLE! 2 OFF 4 PULSE1 IN R50 100K U6 ON 2 3 4 5 5 1 TP34 GND R75 0.01 7 8 TP35 IOUT1 TST + NOTE: PULSE OUT 10mV / AMP C36 3.3uF SHDN NC GND GND GND SENSE/ADJ VIN OUTPUT 4 3 +3.3V 2 R38 LT1129CS8-3.3 C37 1uF 0 TP15 +3.3V TST 1 C35 10uF TP22 SGND B B VIN VOUT1 JP4 EXTVCC_DRV R61 100K 3 VOUT0 U7 R66 30 1W 2512 OPT ON 2 5 OFF 6 1 R65 30 1W 2512 OPT 7 8 SHDN GND GND SENSE/ADJ VIN OUTPUT CUSTOMER NOTICE A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 4 3 C49 4.7uF 2 1 EXTVCC_DRV LT1129CS8-5 C40 1uF 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. NC GND 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 DIGITALLY PROGRAMMABLE DUAL STEP-DOWN DC/DC SUPPLY SIZE N/A SCALE = NONE 2 DATE: IC NO. REV. LTC3880EUJ FAMILY 1 DEMO CIRCUIT 1590B Wednesday, December 07, 2011 SHEET 3 1 OF 3 A