4 3 JP1 OFF JP2 SOFT-START ON C2 0.068uF 50V 0805 FB 9 J1 TP1 D+ 3 TP2 ID 4 GND 5 USB Mini-B TP3 DD+ ID C7 10uF 0603 6.3V R25 1.0 5% * U1 24 VBUS 27 CLPROG R6 2.1k 3 E5 PROG R7 2.0k E6 1 JP5 OFF E9 JP6 OFF E10 VOUT EN1 MODE PULSE-SKIP JP8 E12 VNTC BAT 22 LDO3V3 4 VIN1 6 VIN2 16 5 SW2 ON C9 2.2uF 6.3V 0402 L2 TP5 FB2 EN3 EN3 SW3 ON VNTC E21 E22 GND R20 100k L3 4.7uH 1098AS-4R7M R23 20 TP6 13 17 LDO3V3 3.3V 25mA VOUT1 3.3V 600mA C13 10uF 0603 6.3V R14 1.02M R15 324k BAT GND ENTC 3 E23 ____ RST2 R16 232k E24 C15 10uF 0603 6.3V R17 464k E25 GND L4 4.7uH 1098AS-4R7M R22 20 TP7 R18 806k 12 VOUT2 1.2V 400mA 2 E26 C16 10pF FB3 1 2 3 14 MODE R8 100k OPT J2 DF3-3P-2DSA C18 100uF 6.3V OSCON B6 0 R21 20 7 EN2 ON 18 R24 C11 1.0uF 6.3V 0402 C10 2.2uF 6.3V 0402 3.3uH 1098AS-3R3M 15 * BAT E20 C14 10pF 8 E18 _____ CHRG E19 EN2 MODE GND EN1 19 OFF E11 21 RST2 BURST JP7 GATE R13 510 C12 10pF 1 11 EN3 28 FB1 10 EN2 CHRG E17 Q2 Si2333DS ILIM1 ILIM1 9 EN1 VOUT 23 SW1 ILIM0 GND 0 VOUT 2.9V - 5.5V 1.2A R19 649k C17 10uF 0603 6.3V VOUT3 1.8V 400mA E27 GND 29 JP4 E16 1 1 2 E8 2 ILIM0 VBUS NTC 0 E7 VOUT + 20 PROG ILIM1 Q1 Si2333DS D2 CHRG C8 10uF 0603 6.3V LTC3557EUF-X E4 JP3 4 E15 GND 1 C6 10uF 0603 6.3V E3 ILIM0 R26 1.0 5% R5 10.2k 7 GND CLPROG TP4 C19 22pF 25V 5V ADAPTER 4.5V - 5.5V C5 10uF 0603 6.3V C4 10uF 6.3V 0603 2 2 E14 R4 20 2 1 D- 5V ADAPTER 3 VBUS HV BUCK R3 49.9k 25 VBUS 4.35V - 5.5V RT R2 20k 1% 5 26 E2 1% SHDN GND L1 6.8uH VLCF5020T-6R8 D1 MBRM140 ACPR VBUS 6 2 3 4 R12 806k SW C3 0.1uF 10V WALL SHDN 1 VC RUN 4 BOOST JP10 3 D4 BZT52C16T VIN VC R1 150k 3 1 D3 CMDSH-4E 8 _____ SHDN C1 1uF 50V GND HVIN 8V - 36V 2 U2 LT3505EDD E1 E13 NTC 1 R9 R10 JP9 NTC R11 100k 0 INT EXT 0 CONTROLLED INPUT CURRENT LIMIT * ASSY U1 BAT ILIM1 ILIM0 IBUS(LIM) 0 0 100mA (1X) -A LTC3557EUF 4.2V 0 1 1A (10X) -B LTC3557EUF-1 4.1V 1 0 SUSPEND 1 1 500mA (5X) 4 3 CUSTOMER NOTICE CONTRACT NO. 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 CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. APPROVALS THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 DRAWN: TECHNOLOGY B. Shaffer CHECKED: TITLE: B. Shaffer DESIGNER: SCHEMATIC LTC3557EUF USB PWR MGR with Li-Ion CHARGER and 3 STEP-DOWN REGULATORS + LT3505EDD APPROVED: ENGINEER: 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only SIZE A DATE: DWG NO. REV DC1138A-A/B Wednesday, March 12, 2008 B SHEET 1 1 OF 1 1