4 3 2 1 REVISION HISTORY ECO REV DESCRIPTION APPROVED DATE - 1 PRODUCTION GEORGE B. 9 - 25 - 15 PRESENCE DETECT IN 12 - 40V D4 DFLZ39 39V D1 DFLS240L 4 E10 E9 R37 24.9k C2S1 0.033µF 5% 50V 1206/0805 C2S2 TBD 50V 0805 OPT D2 DFLS240L D3 BZT52C15 13V E1 R1 1.40MEG JP2 RUN ON VIN > 11V OFF R2 412k M1 Si7308DN DISCONNECTED CONNECTED EMBEDDED INDUCTOR E2 GND JP1 16 R11 100k 5% IN RUN FAULT JP3 FREQ CHRG E8 15 FAULT 14 7 FREQ INTVCC Q1 MMBT3904LT1 LRx 47µH BOOST 6 C11 47µF 6.3V 0805 SW CHGSNS BAT E3 E4 PROG 12 R4 2.0k 13 10 5% 2 C3 0.01µF 4 VPROG 3 L1 15.0µH E6 9 C1 4.7µF 25V 0805 PROG BATSNS/FB NC/FBG GND R39 51k 5% M2 Si2343CDS 8 NTC R5 3.01k R12 5.1k 5% C4 2.2µF 6.3V DHC INTVCC E7 1 R3 10k NTC CHRG INTVCC 1.5 MHz 750 kHz 43T Embedded Inductor 3 R36 1k 5% INTVCC 4 U1 LTC4120EUD-4.2 / LTC4120EUD 3 Cx GND C5 10µF 50V 1210 R10 * R9 * 11 BAT 2.7 V - 11V C2 400mA 47µF 16V E5 1210 GND R38 470k 5% VBAR GND 5 17 2 2 JP4 NTC INT R8 0 1 3 2 EXT J1 OPT BAT ENTC GND DF3-3P-2DSA R6 0 * R7 10k ASSY -A UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 10%, 50V -B CUSTOMER NOTICE R9 R10 OPEN 0 Ohm TECHNOLOGY THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 400mA WIRELESS SYNCHRONOUS BUCK BATTERY CHARGER 3 2 N/A SCALE = NONE 1.05MEG 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 SIZE 4 1.40MEG LTC4120EUD 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. NC VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. GEORGE B. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1 U1 LTC4120 - 4.2EUD DATE: IC NO. REV. LTC4120EUD - 4.2 / LTC4120EUD DEMO CIRCUIT 2445A - A / B 9 - 25 - 15 SHEET 1 1 1 OF 2 1 VBAR JP5 MONITOR ENABLE 3 U2A LTC1445CDHD DISABLE R13 10k VPROG 5 2 4 C6 0.01µF 7 1 R15 22.6k 1.186V R31 1k 2 81% 2 69% 2 56% 2 44% 2 31% 2 19% 2 6% D11 1 5% 149 17 3 U2C 11 16 LTC1445CDHD R16 34.8k 10 R30 1k D10 1 5% 149 17 U2D LTC1445CDHD R17 100k 3 13 15 12 R29 1k D9 1 5% 149 17 R18 100k U3A LTC1445CDHD 3 5 2 4 1.186V R19 100k R28 1k D8 1 5% 149 17 U3B LTC1445CDHD 3 7 1 6 R20 100k R27 1k D7 1 5% 149 17 3 U3C LTC1445CDHD R21 100k 11 16 R26 1k D6 1 5% 10 149 17 3 U3D R22 100k 13 15 LTC1445CDHD 12 R25 1k 5% D5 1 UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 10%, 50V 149 17 R23 100k CUSTOMER NOTICE 432 R24 49.9k C8 0.01µF U3.3 C9 0.01µF U2.3 R34 787k C10 1µF 10V V-REF R35 8 R33 22.6k 9 V-REF 8 6 9 94% 5% LTC1445CDHD C7 1µF 10V 2 3 U2B 1.221V R14 432 CHARGE CURRENT D12 1 149 17 5% U2E LTC1445CDHD R32 1k U3E LTC1445CDHD 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 APPLICATION. COMPONENT SUBSTITUTION AND PRINTED APP ENG. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TECHNOLOGY NC GEORGE B. TITLE: SCHEMATIC BAR GRAPH FOR 400mA WIRELESS SYNCHRONOUS BUCK BATTERY CHARGER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. N/A SCALE = NONE 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. LTC4120EUD - 4.2 / LTC4120EUD DEMO CIRCUIT 2445A - A / B 9 - 25 - 15 SHEET 1 2 OF 2