4 3 2 1 REVISION HISTORY E1 ECO REV 1 2 DESCRIPTION APPROVED DATE GB 2 - 9 - 16 PRODUCTION FAB VSUP E2 4 VIN 3 - 5.5V 2A R3 12.4k R1 2.2k 5% VIN 4 R2 22mOhm 1% C4 0.01µF D1 PWR VBUS ID GND 4 3 2 5 C1 100µF 6.3V 1206 C2 100µF 6.3V 1206 R5 100k R6 100k R7 OPT R12 102k C3 100µF 6.3V 1206 3 R42 1 0603 OPT R18 10k R17 2.2k 5% EN DISABLE JP1 U1 ENABLE 1 TP2 R43 1 0603 4 3 TP1 R13 0 D2 OPT 15 E3 12 11 10 7 9 5 E4 2 14 6 13 GND R9 3.83k R10 59.0k R11 OPT R14 348k C5 0.01µF C6 4700pF C7 470pF D5 STATUS 17 20 IN2 IN IN1 STAT 8 3 IS+ ISSW1 19 PTHM PTH1 PTH2 DTH FTH IIMON CTx 0.1µF SW2 LTx 24µH T JSC connector 18 10k@25°C 1206 100V CTS CTD NTC FB GND PGND LTC4125EUFD 16 21 E5 GND NTC EN 2 R8 0 GND C12 47µF 10V 0805 C11 47µF 10V 0805 C10 1uF 16V D3 BAT54LP 9 8 7 6 GND GND GND GND D+ D- R4 OPT 1 R16 100k 0603 TP3 Ith = 1.29A Ilim = 1.93A 2 R15 5.23k C8 0.1µF 1 J1 USB Micro B RECEPTACLE Wurth, 629105136821 D4 BAS521 NTC DISABLE C9 0.1µF 0603 100V JP2 2 ENABLE IMON UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 10%, 50V CUSTOMER NOTICE 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. 1 TECHNOLOGY NC GB TITLE: SCHEMATIC AUTORESONANT WIRELESS TRANSMITTER SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 2 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. LTC4125EUFD DEMO CIRCUIT 2330A 2 - 9 - 16 2 SHEET 1 1 OF 2 1 4 JP3 VIN 3 2 MONITOR ENABLE IMON U2A LTC1445CDHD DISABLE R19 10k 5 5% C13 0.01µF U2B 1.221V 7 8 V-REF 9 R21 15.4k R20 432 3 1 R22 27.4k 11 U2D LTC1445CDHD 13 U3A LTC1445CDHD 5 R39 6.20k 3 D11 86% 5% 149 17 R38 6.20k 3 D10 71% 5% 149 17 R37 6.20k 3 3 D9 57% 2 4 5% 149 17 1.186V R25 102k U3B LTC1445CDHD 7 R36 6.20k 3 D8 43% 1 6 R26 102k 5% 149 17 2 U3C LTC1445CDHD R27 102k 11 U3D 3 13 3 15 12 149 17 R32 787k C17 1µF 16V 3 V-REF 8 C16 0.01µF U3.3 R33 432 9 C15 0.01µF U2.3 29% R34 6.20k 5% D6 14% CUSTOMER NOTICE R31 11.3k 1 D7 5% 149 17 LTC1445CDHD R29 102k R35 6.20k 16 10 R28 102k 4 100% 15 12 R24 102k R30 102k 4 D12 16 10 R23 340k 2 R40 6.20k 5% 149 17 LTC1445CDHD 3 150% 1.186V U2C C14 1µF 16V INPUT CURRENT 5% 149 17 LTC1445CDHD 6 U2E LTC1445CDHD D13 2 4 4 R41 2.2k 3 1 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 GB TITLE: SCHEMATIC SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 IC NO. N/A SCALE = NONE DATE: 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only BAR GRAPH FOR AUTORESONANT WIRELESS TRANSMITTER REV. LTC4125EUFD DEMO CIRCUIT 2330A 2 - 9 - 16 2 SHEET 1 2 OF 2 1