5 4 3 2 1 REVISION HISTORY ECO E1 5.1 C1 0805 E3 C3 + 56uF 63V 63HVH56M GND E4 C2 + 56uF 63V 63HVH56M C16 4.7uF 100V 1210 R1 100k PVIN R2 510k SENSVIN SENSTOP U1 E2 D 9 SHDN 10 E5 R28 51k LTC4020EUHF INT_Vcc 15 E7 25 ILIMIT R4 100k RNG/SS SW1 SW2 D1 SBR0560S1 12 2 30 R36 0 38 32 R31 ILIMIT TG1 1 5-29-13 8-13-12 R24 D3 RED R27 3K R26 3K E14 C20 0.22uF 25V 0603 D7 OPT E16 VOUT 21V - 28V 3A MAX VOUT OPT 0603 C30 OPT 0603 0 2 D4 GREEN 0603 C19 0.22uF 25V 0603 M2A Si7960DP C14 4.7uF 1210 100V 4 D6 B360A VOUT L1 M3B C18 4.7uF 1210 100V C27 4.7uF 1210 100V C28 4.7uF 1210 100V + C15 56uF 63V 63HVH56M + C17 56uF 63V 63HVH56M Si7960DP 15uH R7 20 BG1 37 R22 0 D5 B360A OPT 4 C C24 OPT R8 226k 0.1% 0603 R9 226k C25 OPT SENSBOT SENSGND 19 R37 26 VFBMAX BG2 TG2 VFB E9 E17 16 NTC 24 E8 11 MODE 14 B 8 R12 100k C5 0.1uF 1206 R20 23 NTC BGATE 22 21 R35 100 RCBAT1 0.015 0.5W 1206 R18 100 1 2 3 C10 1nF 0603 25V 4 M1 Si7461DP VBAT BAT TIMER OPT 0603 E12 5 6 7 8 MODE RT E10 0 CSOUT R13 100k R17 C11 2.2uF 0603 FBG CSN C4 100pF 16V 0 R19 4.7 18 R14 10k C R23 0 33 31 R11 24.9k R29 OPT SGND 2 RCBRB1 0.008 0.5W 1206 VFBMIN CSP R10 24.9k 0.1% C12 0.033uF R34 0 17 INT_VCC 5 4 0 Vc ITH SGND SGND PGND SGND 3 29 35 39 C13 OPT GND E13 M3A Si7960DP C31 OPT 0603 3 R21 E15 8 7 R32 OPT 0603 1 R6 20 0 R25 XAL1010-153ME 5 6 M2B Si7960DP 1 3 VBAT DATE Charlie Z. GB D D2 SBR0560S1 13 R5 100k APPROVED INT_VCC VIN_REG STAT1 BST1 BST2 RNG / SS 34 C21 10uF 6.3V 0805 STAT2 DESCRIPTION PRODUCTION 1st PROTOTYPE RCBRT1 0.008 0.5W 1206 C22 0.033uF OPT 7 6 SHDN R3 OPT E6 2 1 0603 100V 36 C23 4.7uF 100V 1210 REV __ 0.1uF 6 5 R38 7 8 VIN 15V - 55V 20 28 27 C26 OPT 1210 R15 56k C7 OPT C6 10nF 0603 R16 47k C9 68pF BAT 25.2V VFLOAT 3.3A MAX B GND E11 C8 680pF 0603 0603 NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. A 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. TECHNOLOGY HZ Charlie Z. TITLE: SCHEMATIC HIGH VOLTAGE BUCK / BOOST MULTI-CHEMISTRY BATTERY CHARGER SIZE N/A THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 5 4 3 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 DATE: IC NO. REV. LTC4020EUHF 2 DEMO CIRCUIT 2044A Friday, September 20, 2013 SHEET 1 1 OF 1 A