1 4 5 6 7 R12 10K 1% 1 2 3 OFF C1 0.1uF 16V C2 0.1uF 16V JP2 SENSE+ 16 SENSE- 15 3 UV ISET 14 4 OV IMON 13 5 TIMER FB 12 6 INTVCC FAULT 11 PG 10 7 GND 8 SOURCE GATE RSET1 (Opt.) D6 LED (RED) PG FAULT R8 10 3 2 1 R11 1K C3 0.01uF JP1 9 POSITIVE 24V HOT SWAP 1 1 GND E3 E5 FAULT Output E6 PG E7 IMON E8 ISET Alternate Part For Q1 SUM110MO3-03P B R13 .002 C6 0.1uF 16V UV 4 OV 5 TIMER 6 SENSE- 15 ISET 14 IMON 13 FB 12 FAULT 11 PG 10 INTVCC 7 GND 8 SOURCE GATE RSET2 (Opt.) RMON2 20K 1% 1 D13 LED (RED) PG R18 10 D10 (Opt.) D14 (Opt.) GND 3 2 1 Signal Auto-Retry JP3 E11 R19 1K C5 0.01uF AUX_UV FAULT 3 2 1 D11 LED (GRN) 4 1 D12 LED (RED) FAULT 12V/7.5A 2 VDD 3 16 COUT2 (Opt.) R15 3.3K E10 2 2 SENSE+ 2 C4 0.1uF 16V NC 2 2 E12 1 Q2 Si7880ADP R17 3.3K 1 R16 3.3K 2 1 1 2 D9 LED (GRN) U2 LTC4218CDHC-12 + CIN2 (Opt.) VOUT 3 2 1 1 8 7 6 5 R14 3.3K 1 E9 D8 SMBJ12A GND A Signal Auto-Retry B C 24V/7.5A D4 LED (GRN) D3 (Opt.) R9 10K 1% D7 (Opt.) FAULT RMON1 20K 1% COUT1 (Opt.) E2 2 VDD R7 158K 1% R4 6.8K 1206 2 NC 2 R6 6.8K 1206 2 2 E4 1 D5 LED (RED) Q1 Si7880ADP 2 R10 3.24K 1% ON R5 6.8K 1206 VOUT 3 2 1 1 U1 LTC4218CGN 1 1 + CIN1 (Opt.) D2 LED (GRN) AUX_UV 12VIN 8 4 R3 200K 1% 2 D1 SMBJ24A 8 7 6 5 1 R2 6.8K 1206 2 E1 A GND 3 R1 .002 1 24VIN 2 C OFF ON JP4 9 POSITIVE 12V HOT SWAP E13 FAULT Output E14 PG E15 IMON E16 ISET LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY LINEAR TECHNOLOGY CORPORATION Customer Notice D Table ASSEMBLY U1 DC1052A-A LTC4218CGN LTC4218CDHC-12 DC1052A-B Future Use Future Use 1 U2 2 3 4 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. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. 5 6 D 1630 McCARTHY BLVD. MILPITAS, CA. 95035 PHONE (408) 954-8400 FAX (408) 434-0507 Title Size LTC4218CGN, LTC4218CDHC-12 Positive 24V, Positive 12V Hot Swap Document Number Rev Demo Circuit 1052A-A/B Date: Tuesday, February 05, 2008 7 Sheet 1 of 8 1