5 4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE __ 2 PRODUCTION CHARLIE Z. 3-27-14 VIN E1 15V - 55V C1 R38 VIN E3 + GND D E4 C3 56uF 63V 63HVH56M + C2 56uF 63V 63HVH56M 5.1 0805 C34 C33 C32 C29 OPT 1210 C23 C16 4.7uF 100V 1210 36 R1 100k 0.1uF 100V 0603 PVIN R2 510k SENSVIN SENSTOP RCBRT1 0.002 1W 2512 C22 OPT 7 6 D INT_VCC GND U1 LTC4020EUHF E2 9 SHDN 10 E5 INT_Vcc 34 C21 10uF 6.3V 0805 SHDN VIN_REG R4 51k R3 OPT STAT2 STAT1 BST1 BST2 D1 SBR0560S1 25 C40 0.22uF 0603 RNG/SS SW1 SW2 R36 0 3K 38 32 ILIMIT 5 6 7 8 1 5 6 7 8 R24 0 4 M6 OPT 4 1 2 3 BG1 37 R22 M4 SiR664DP 5 6 7 8 5 6 7 8 SENSBOT SENSGND 19 R37 26 0 17 5 4 R21 0 C12 0.033uF BG2 TG2 VFB CSP 33 31 NTC 24 MODE INT_VCC 2 CC/CV 4 CC 6 LEAD-ACID 11 14 8 JP1 R14 10k C4 100pF 16V C5 0.22uF 0603 R13 100k R17 OPT 0603 NTC BGATE 1210 35V 1210 35V 1210 35V TIMER RT Vc ITH SGND SGND PGND SGND 3 29 35 39 C GND 4 3 2 1 R23 0 RCBAT1 0.008 1W 2512 C11 4.7uF 6.3V 0603 22 R18 100 R35 21 1 2 3 C10 OPT 0603 4 E10 M1 Si7145DP BAT VBAT E12 5 6 7 8 20 28 27 C26 OPT 1210 C7 OPT 0603 R15 36k 0603 R16 47k 0603 C9 OPT 0603 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. APPROVALS PCB DES. APP ENG. TECHNOLOGY LT HIGH POWER BUCK / BOOST MULTI-CHEMISTRY BATTERY CHARGER N/A SCALE = NONE 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only CHARLIE Z. TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 GND C8 47pF 0603 CUSTOMER NOTICE NOTE: UNLESS OTHERWISE SPECIFIED B BAT 25.2V FLOAT 6.3A MAX E11 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. 4 VOUT 21V - 28V 8A MAX 8 7 6 5 CSOUT BAT C17 + 220uF 35V 35HVH220M E13 0 MODE + C15 220uF 35V 35HVH220M R20 23 A 5 1210 35V C38 C37 C36 C35 OPT 1210 R25 0 M8 OPT R34 0 C6 6.8nF 0603 C13 OPT 0603 C28 10uF 4 FBG CSN 1 3 5 R32 OPT 0603 M7 3 2 1 SiR422DP E9 16 C27 10uF GND 100 E17 C18 10uF E15 R19 20 18 C14 10uF M3 SiR422DP 8 7 6 5 C31 OPT 0603 1 2 3 R11 24.9k 1% SGND B 4 3 2 1 3 2 1 RCBRB1 0.002 1W 2512 VFBMIN VFBMAX D5 OPT M5 OPT 4 1 2 3 C25 OPT VOUT E16 8 7 6 5 D6 B360A L1 5.6uH 0 R9 226k 0603 1% R10 24.9k 0.1% E14 8 7 6 5 WURTH 7443556560 R7 20 R8 226k 0603 0.1% VOUT D7 OPT 4 1 2 3 4 C24 OPT C20 0.22uF 25V 0603 M9 OPT C30 OPT 0603 VOUT R6 20 C19 0.22uF 25V 0603 R31 OPT 0603 M2 SiR664DP VBAT D4 GRN R26 12 2 30 C39 0.22uF 0603 TG1 C D3 RED R27 3K 13 0603 15 D2 SBR0560S1 DATE: IC NO. REV. LTC4020EUHF 2 DEMO CIRCUIT 2134A Thursday, March 27, 2014 SHEET 1 1 OF 1 A