5 4 3 2 ECO REV - 1 REVISION HISTORY DESCRIPTION APPROVED Replaced obsolete LED's B EN2 D CMP2 CMP1 CMP4 CMP3 SQT1 SQT2 8 RT4 9 SQT1 10 SQT2 11 MS1 12 RDIS ON B CMP1 CMP4 CMP3 V3 32 33 CMP3 34 CMP4 36 35 CMP1 CMP2 PTMR RT1 STMR RT2 VSEL RT3 GND RT4 HVCC SQT1 VCC SQT2 RST# MS1 OV# 13 MS2 37 REF MS2 MS1 CMP2 V3 31 EN3 30 V4 29 EN4 28 RTMR 27 PTMR 26 STMR EN3 V4 EN4 C 25 VSEL 24 HVCC 23 22 21 20 C1 C2 2.2uF C3 1uF 25V C4 1uF 25V C5 0.047uF RST# MS2 RDIS OV# ON FLT# CAS E1 CAS VSEL 0.022uF VCC FLT# RT4 7 RT3 RTMR DONE# RT3 RT2 D 19 RT2 6 NC NC RT1 RT1 EN4 18 REF C 5 V4 V1 17 4 REF EN1 ON 3 EN3 U1 LTC2928CUHF CAS V1 OVA 16 2 RDIS V1 1 EN1 15 EN1 OVA EN2 V2 OVA Oct 20, 2015 EN2 V3 38 V2 14 V2 DATE Vlad Ostrerov RST# OV# B FLT# E2 DONE# R1 3.3K JP1 VCC OPERATION 1 LAST 2 NOT LAST 3 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. A APPROVALS PCB DES. APP ENG. TECHNOLOGY RB Vlad Ostrerov TITLE: SCHEMATIC 5 4 3 N/A SCALE = NONE 2 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 IC NO. Multichannel Power Supply Sequencer and Supervisor LTC2928CUHF Demo Circuit 1029B MODIFY DATE: Oct 20, 2015 SHEET 1 REV. 1 1 OF 5 5 4 3 2 1 5V_AUX 5V_AUX EN1 EN1 EN2 D R2 300 R3 300 R4 300 R5 300 R6 300 R7 300 R8 300 D EN2 EN3 R9 300 EN3 EN4 EN4 CMP1 D1 EN1 YEL D2 EN2 YEL D3 EN3 YEL CMP1 CMP2 D4 EN4 YEL D5 CMP1 ORN D6 CMP2 ORN D7 CMP3 ORN D8 CMP4 ORN CMP2 CMP3 CMP3 CMP4 CMP4 ON EN1 Q1 2N7002 EN2 Q2 2N7002 Q3 2N7002 EN3 Q4 2N7002 EN4 CMP1 Q5 2N7002 Q6 2N7002 CMP2 Q7 2N7002 CMP3 ON RST# Q8 2N7002 CMP4 RST# OV# OV# FLT# FLT# C C VCC U2 LTC2950CTS8-1 5V_AUX R39 10K VCC INT C6 S1 B E4 ON Q9 2N7002 ON D10 RESET RED D11 OVERVOLTAGE RED E5 E6 RESET OV# D12 FAULT RED OVERVOLTAGE E7 1 ON KILL 8 JP2 ON INT_ON 2 3 EXT_ON E3 ON C7 4700pF RST# 6 PB OFFT 2 PB D9 ON GRN EN/EN ONT 0.1uF R10 10K 7 R14 1.5K GND R13 1.5K 3 R12 1.5K 5 VIN 4 R11 300 1 C8 4700pF B FLT# FAULT LED Display APPROVALS A PCB DES. TECHNOLOGY RB APP ENG. Vlad Ostrerov TITLE: SCHEMATIC N/A 5 4 3 2 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 Multichannel Power Supply Sequencer and Supervisor IC NO. LTC2928CUHF Demo Circuit 1029B MODIFY DATE: Oct 20, 2015 REV. 1 SHEET 1 2 OF 5 5 4 D 3 V1_INT JP3 V1 1 INT 2 E8 V1_FET V1_FET E10 EN1 EN1 3 100 E11 EN3 R17 V1_MON V1 100 V1_POL V3_MON C10 TBD V1 3 D EXT Q11 IRL3704ZSPBF R16 EN3 182K 1% E12 V1_MON V3_INT JP4 V3 1 INT 2 V3_FET EXT EN3 C9 TBD 1 E9 V3_FET Q10 IRL3704ZSPBF R15 EN1 2 R18 118K 1% E13 V3_MON V1_POL V3 V3 R19 49.9K 1% R20 49.9K 1% C C V2_INT 1 E14 V2_FET E16 EN2 EN2 3 V4_FET EXT E17 EN4 EN4 100 V2_MON C11 TBD R23 88.7K 1% E18 V2_MON B E15 V4_FET Q12 IRL3704ZSPBF R21 EN2 INT 2 V2_FET V2 V4_INT JP6 V4 1 INT 2 JP5 V2 100 V4_MON C12 TBD V2 R24 261K 1% E19 V4_MON R25 49.9K 1% EXT Q13 IRL3704ZSPBF R22 EN4 3 V4 V4 B R26 49.9K 1% MOSFETS for Sequencing On Board Regulators or External Supplies APPROVALS A PCB DES. TECHNOLOGY RB APP ENG. Vlad Ostrerov TITLE: SCHEMATIC N/A 5 4 3 2 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 Multichannel Power Supply Sequencer and Supervisor IC NO. LTC2928CUHF Demo Circuit 1029B MODIFY DATE: Oct 20, 2015 REV. 1 SHEET 1 3 OF 5 5 4 3 2 1 Performance Adjustment VCC JP8 VSEL 1 RT1 CONTROL RT1 RT1 3 4 TIME POSITION ALL POSITIVE V1 V1 R28 REF REF 3 VCC R30 24.3K 1% RT2 CONTROL RT2 RT2 VCC SQT2 4 OVA 4 VCC 1 FORCE OFF 1 2 >32% 3 4 RT3 RT3 4 B R34 3.40K 1% RT4 RT4 5 6 32% <32% MS1 MASTER SLAVE CONFIGURATION VCC R31 1 (Opt) 2 MS2 GND JP15 MS2 VCC OPEN 3 GND R33 5.1K FORCE OFF B HVCC VIN JP17 VCC Select 1 VCC HVCC(8V to 16.5V) 1 2 VCC LOW VCC 3 RESET DISABLE LOW VCC(2.9V to 6V) JP18 RDIS VCC 2 RDIS RDIS 3 4 JP19 RT4 CONTROL 1 FORCE ON 2 TIME POSITION 3 OPEN GND FORCE OFF APPROVALS A PCB DES. TECHNOLOGY RB APP ENG. Vlad Ostrerov 4 3 2 A TITLE: SCHEMATIC N/A SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE 5 OPEN 3 HVCC E20 VCC IN LOW Vcc:2.9V-6V HVcc:8V-16.5V 4 GND VCC 4 VCC RT4 CONTROL OPEN JP12 MS1 4 MS2 RT3 CONTROL VCC C MS1 VCC JP16 RT3 CONTROL 1 FORCE ON 2 TIME POSITION 3 D 2 JP14 OVA CONFIG ABOVE UV R_VCC JP10 SQT2 1 3 (Opt) R_GND R32 9.53K 1% SQT2 VCC OVA GND 2 R29 JP13 RT2 CONTROL 1 FORCE ON 2 TIME POSITION 3 OPEN 3 V1_NEG TBD C SQT1 SEQUENCING THRESHOLD SELECTION JP11 V1_POLARITY 1 V1_POS 2 V1_POL V1_POL FORCE OFF SQT1 V1_NEG JP9 RT1 CONTROL 1 FORCE ON 2 R27 95.3K 1% VCC 4 3 VCC JP7 SQT1 1 2 2 VSEL VSEL D VCC Multichannel Power Supply Sequencer and Supervisor IC NO. LTC2928CUHF Demo Circuit 1029B MODIFY DATE: Oct 20, 2015 REV. 1 SHEET 1 4 OF 5 5 4 3 2 1 On Board LT1761ES Regulators D D 5V_AUX E21 5V_AUX IN 5 V1_INT C14 0.01uF SHDN BYP 4 1 V1_INT C15 10uF 6.3V C19 10uF 6.3V 2 3 E24 C OUT R35 10K U5 LT1761ES5-1.8 IN OUT C20 0.01uF 3 SHDN E28 SHDN2.5 V3_INT 5 R37 10K GND 1 C13 10uF 6.3V GND 3 EXTERNAL E23 V3_INT E22 V1_INT U3 LT1761ES5-2.5 BYP 4 V3_INT C21 10uF 6.3V 2 JP20 SUPPLIES SELECTION 1 LOCAL ON BOARD 2 SHDN1.8 C E26 V2_INT E27 V4_INT U4 LT1761ES5-1.5 B 5 C17 0.01uF 3 SHDN GND R36 10K V2_INT BYP 4 E25 SHDN1.5 1 V2_INT C18 10uF 6.3V C22 10uF 6.3V IN OUT V4_INT 5 R38 10K C23 0.01uF 3 GND OUT SHDN E29 2 C16 10uF 6.3V IN BYP 4 V4_INT C24 10uF 6.3V 2 1 U6 LT1761ES5-3.3 SHDN3.3 E30 GND E31 GND E32 GND E33 GND B E34 GND APPROVALS A PCB DES. TECHNOLOGY RB APP ENG. Vlad Ostrerov TITLE: SCHEMATIC N/A 5 4 3 2 A LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY SIZE SCALE = NONE 1630 McCarthy Blvd. Milpitas, CA 95035 www.linear.com Phone: (408)432-1900 Fax: (408)434-0507 Multichannel Power Supply Sequencer and Supervisor IC NO. LTC2928CUHF Demo Circuit 1029B MODIFY DATE: Oct 20, 2015 REV. 1 SHEET 1 5 OF 5