DEMO MANUAL DC2229A DC2229A-A: LTC3877 DC2229A-B: LTC3877/LTC3874 High Current Step-Down Converter Description Demonstration circuits 2229A-A and 2229A-B feature the LTC®3877 in two high output current, high efficiency, VID programmed step-down converters with sub-mΩ DCR sensing. For both converters, the input voltage range is 6V to 14V and the switching frequency is 400kHz. The DC2229A-A provides two outputs. VOUT1 is VID programmable from 0.6V to 1.23V and VOUT2 is set for 1.5V. Both rails have a maximum load current of 30A. The DC2229A-B assembly is a four phase converter providing a VID programmable output of 0.6V to 1.23V with a maximum load current of 120A. Phases 1 and 2 are controlled by the LTC3877 and phases 3 and 4 are controlled by the LTC3874 slave controller. The demo board uses 0.25µH inductors with a DCR value of 0.325mΩ. The LTC3877 and LTC3874 employ a proprietary sub-mΩ DCR sensing architecture which enhances the signal to provide accurate control of the inductor current. The low DCR inductors, along with the use of low Qg/low RDS(ON) discrete FETs and strong gate drivers provides high efficiency for high output current supplies. The full load efficiency is 90.3%, as seen on the 1.5V rail of the LTC3877 dual output converter (DC2229A-A assembly) with an input voltage of 12V. Additional features of this demo board include: n Remote sensing n PLLIN and CLKOUT pins n PGOOD, RUN and TK/SS pins n Optional resistors to tie two or more phases together n Optional footprints for BSG0811 dual channel MOSFETs n n Optional NTC network on the ITEMP pin of the LTC3877 for less current limit variation over temperature Dynamic load circuit The demo board uses a high density, two-sided drop-in layout. The core components for each dual phase section consists of MOSFETs, inductors, ceramic CIN, ceramic COUT on the top layer and the control circuit on the bottom, resides in a 1.3" x 1.3" area of the board. The LTC3877 and LTC3874 data sheets provide a complete description of the IC operation and application information. These data sheets must be read in conjunction with the quick start guide. Design files for this circuit board are available at http://www.linear.com/demo/DC2229A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. dc2229af 1 DEMO MANUAL DC2229A Performance Summary Table 1. DC2229A-A Performance Summary (TA = 25°C), No Airflow PARAMETER CONDITIONS Minimum Input Voltage VALUES 6V Maximum Input Voltage 14V Output Voltage VOUT1, VID programmed IOUT1 = 0A to 30A, VIN = 6V to 14V VID0–VID5 = L VID0, VID5 = L, VID1–VID4 = H VID0–VID5 = H 0.6V ± 1% 0.9V ± 1% 1.23V ± 1% Output Voltage VOUT2 IOUT2 = 0A to 30A, VIN = 6V to 14V 1.5V ± 1.5% VOUT1 Maximum Output Current, IOUT1 VIN = 6V to 14V 30A VOUT2 Maximum Output Current, IOUT2 VIN = 6V to 14V 30A Nominal Switching Frequency 400kHz Efficiency VOUT1 = 1.2V, IOUT1 = 30A, VIN = 12V 89.1% typical See Figures 3 to 5 VOUT2 = 1.5V, IOUT2 = 30A, VIN = 12V 90.3% typical Table 2. DC2229A-B Performance Summary (TA = 25°C), No Airflow PARAMETER CONDITIONS VALUES Minimum Input Voltage 6V Maximum Input Voltage 14V Output Voltage VOUT, VID programmed IOUT1 = 0A to 120A, VIN = 6V to 14V VID0–VID5 = L VID0, VID5 = L, VID1–VID4 = H VID0–VID5 = H 0.6V ± 1% 0.9V ± 1% 1.23V ± 1% VOUT Maximum Output Current, IOUT VIN = 6V to 14V 120A Nominal Switching Frequency Efficiency, See Figure 6 2 400kHz VOUT = 1.2V, IOUT1 = 120A, VIN = 12V 88.8% typical dc2229af DEMO MANUAL DC2229A Quick Start Procedure Demonstration circuits 2229A-A and 2229A-B are easy to set up to evaluate the performance of the LTC3877 and LTC3874. Please refer to Figure 1 (DC2229A-A assembly) and Figure 2 (DC2229A-B assembly) for the proper measurement equipment setup and follow the procedure below. 1)With power off, connect the input supply, load and meters as shown in Figure 1 or Figure 2. Preset the load to 0A and VIN supply to be 0V. For both assemblies, place the jumpers in the following positions: JP10 RUN ON JP8 MODE FCM JP7 VID_EN H JP1, JP6 VID0,VID5 L JP2-JP5 VID1–VID4 H 2)Increase the input voltage to 12V. 3)Check the output voltage. 6)Adjust the input voltage and load current to the desired levels within their limits and observe the regulation, output ripple, load step response, efficiency and other parameters. 7)Adjust VOUT1 with VID0–VID5 at JP1–JP6. Refer to the data sheet for the VID programming table. NOTE 1: To monitor the output voltage ripple, use the BNC connectors labeled VOUT1 and VOUT2. VOUT1 is at J9 and VOUT2 is at J10. NOTE 2: Do not connect load between the VO1_SNS+ and VO1_SNS– turrets or between the VO2_SNS+ and VO2_SNS– turrets. This could damage the converter. Only apply load across the stud connectors on the edge of the board which are located at J3 through J8. Dynamic Load Circuit (Optional) Demonstration circuit 2229A provides a simple load step circuit consisting of a MOSFET and sense resistor for VOUT1 and VOUT2. To apply a load step, follow the steps below. a) For the LTC3877 dual output converter (2229A-A assembly), VOUT1 should be 0.9V ± 1%. VOUT2 should be 1.5V ±1.5%. 1)Pre-set the amplitude of a pulse generator to 0.0V and the duty cycle to 5% or less. b)For the LTC3877/LTC3874 four phase converter (DC2229A-B assembly), VOUT1 should be 0.9V ± 1%. 2)To monitor the load step current, connect a scope probe across the ISTEP+/– turrets for that rail. 4)Next, apply full load and re-measure VOUT. 3)Connect the output of the pulse generator to the PULSE GEN turret for the rail under test and connect the return to the adjacent GND turret. a) For the LTC3877 dual output converter (DC2229A-A assembly), the full load current is 30A for VOUT1 and 30A for VOUT2. b)For the LTC3877/LTC3874 four phase converter (DC2229A-B assembly), the full load current is 120A. 5)Re-check regulation. 4)With the converter running, slowly increase the amplitude of the pulse generator output to provide the desired load step pulse height. The scaling for the load step signal is 2mV/A. 5)For the four-phase LTC3877/LTC3874 converter (DC2229A-B assembly), either load step circuit can be used. dc2229af 3 DEMO MANUAL DC2229A Quick Start Procedure – VOUT1 LOAD + + VOUT2 LOAD – IOUT2 IOUT1 + – VOUT1* + – VOUT2* DC2229 F01 IIN * MONITOR THE OUTPUT VOLTAGE ACROSS EITHER COUT1 OR COUT6 FOR ACCURATE EFFICIENCY MEASUREMENTS + VIN – VIN SUPPLY + – Figure 1. Proper Measurement Equipment Setup for the Dual Output LTC3877 Converter (DC2229A-A Assembly) 4 dc2229af DEMO MANUAL DC2229A Quick Start Procedure + LOAD – IOUT + – VOUT IIN + VIN – DC2229 F02 VIN SUPPLY + – Figure 2. Proper Measurement Equipment Setup for the Four Phase LTC3877/LTC3874 Converter (DC2229A-B Assembly) dc2229af 5 DEMO MANUAL DC2229A Quick Start Procedure 95 90 EFFICIENCY (%) 90 EFFICIENCY (%) 95 VIN = 12V FSW = 400kHz FCM 85 80 VOUT = 1.2V VOUT = 1.0V VOUT = 0.9V VOUT = 0.6V 75 70 0 5 10 20 15 25 LOAD CURRENT (A) 30 85 80 75 70 35 FCM FSW = 400kHz 0 5 10 20 15 25 LOAD CURRENT (A) dc2229 F03 Figure 3. Efficiency Curves for VOUT1 of the LTC3877 Dual Output Converter (DC2229A-A Assembly) Across the Programmable VID Range. VIN = 12V 95 80 75 70 95 0 5 10 20 15 25 LOAD CURRENT (A) 30 VOUT1 = 12V FSW = 400kHz FCM 90 85 80 VOUT = 1.2V VOUT = 1.0V VOUT = 0.9V VOUT = 0.6V 75 VIN = 7V VIN = 12V VIN = 14V 35 dc2229 F05 Figure 5. Efficiency Curves for VOUT1 of the LTC3877 Dual Output Converter (DC2229A-A Assembly) as the Input Voltage Is Varied. VOUT1 is set to 1.0V 6 Figure 4. Efficiency Curves for the 1.5V Rail at VOUT2 on the LTC3877 Dual Output Converter (DC2229A-A Assembly) at VIN = 12V EFFICIENCY (%) EFFICIENCY (%) 85 35 dc2229 F04 VOUT1 = 1.0V FSW = 400kHz FCM 90 30 70 0 5 10 20 15 25 LOAD CURRENT (A) 30 35 dc2229 F06 Figure 6. Efficiency Curves for VOUT1 of the Four Phase LTC3877/LTC3874 Converter (DC2229A-B Assembly) Across the VID Programming Range. VIN = 12V dc2229af DEMO MANUAL DC2229A Quick Start Procedure VOUT = 0.9V VIN = 12V VOUT1 50mV/DIV 119mV 30A LOAD STEP 5A/DIV 15A 50µs/DIV DC2229 F07 Figure 7. Load Step Response of VOUT1 on the Dual Output LTC3877 Converter (DC2229A-A Assembly) VIDEN = L, VID0,5 = L, VID1-4 = H COUT:3x Panasonic EEFSX0E331ER (330µF, 2.5V, 9mΩ) || 2x Murata GRM31CR60G227ME11L (220µF, 4V, X5R, 1206) FSW: 400kHz VOUT = 1.5V VIN = 12V VOUT2 50mV/DIV 106mV 30A LOAD STEP 5A/DIV 15A 50µs/DIV DC2229 F08 Figure 8. Load Step Response of VOUT2 on the Dual Output LTC3877 Converter (DC2229A-A Assembly) COUT:3x Panasonic EEFSX0E331ER (330µF, 2.5V, 9mΩ) || 2x Murata GRM31CR60G227ME11L (220µF, 4V, X5R, 1206) FSW: 400kHz VOUT = 0.9V VIN = 12V VOUT 50mV/DIV 91mV 120A LOAD STEP 10A/DIV 90A 50µs/DIV DC2229 F09 Figure 9. Load Step Response of the Four Phase LTC3877/LTC3874 Converter (DC2229A-B Assembly) VIDEN = L, VID0,5 = L, VID1-4 = H COUT:3x Panasonic EEFSX0E331ER (330µF, 2.5V, 9mΩ) || 2x Murata GRM31CR60G227ME11L (220µF, 4V, X5R, 1206) FSW: 400kHz dc2229af 7 DEMO MANUAL DC2229A Parts List ITEM QTY DC2155A-A REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP, 0.1µF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C104K DC2229A-A Required Circuit Components 1 6 C1, C4, C6, C8, C14, C15 2 1 C10 CAP, 3.3nF, X5R, 25V, 10%, 0603 TDK, C0603X5R1E332K 3 1 C11 CAP, 4.7µF, X5R, 16V, 10%, 0805 AVX, 0805YD475KAT2A 4 1 C12 CAP, 47pF, COG, 50V, 5%, 0603 AVX, 06035A470JAT2A 5 1 C13 CAP, 2.2nF, X7R, 25V, 10%, 0603 AVX, 06033C222KAT2A 6 4 C2, C3, C18, C19 CAP, 0.22µF, X7R, 16V, 10%, 0603 AVX, 0603YC224KAT2A 7 2 C5, C17 CAP, 10µF, X5R, 16V, 10%, 0805 AVX, 0805YD106KAT2A 8 1 C9 CAP, 100pF, C0G, 50V, 5% 0603 AVX, 06035A101JAT2A 9 4 CIN1, CIN2, CIN3, CIN4 CAP, 22µF, X5R, 16V, 10%, 1210 MURATA, GRM32ER61C226KE20L 10 2 CIN9, CIN10 CAP, OS-CON, 180µF, 16V, 20%, SVP-F8 PANASONIC, 16SVP180MX 11 4 COUT1, COUT2, COUT6, COUT7 CAP, 220µF, X5R, 4V, 10%, 1206 MURATA, GRM31CR60G227ME11L 12 6 COUT3–COUT5, COUT8–COUT10 CAP, SPECIALTY POLYMER, 330µF, 2.5V, 7343 PANASONIC, EEFSX0E331ER 13 2 D1, D2 DIODE, SCHOTTKY, SOD-323 CENTRAL SEMI, CMDSH-3TR 14 2 L1, L2 INDUCTOR, 0.25µH WURTH ELEKTRONIK, 744301025 15 2 Q1, Q3 MOSFET N-CH 25V 39A TDSON-8 INFINEON, BSC050NE2LS 16 2 Q2, Q4 MOSFET N-CH 25V 38A TDSON-8 INFINEON, BSC010NE2LSI 17 2 R12, R28 RES, 665Ω, 1/10W, 1%, 0603 NIC, NRC06F6650TRF 18 1 R15 RES, 2.2Ω, 1/10W, 1%, 0603 NIC, NRC06F2R20TRF 19 1 R16 RES, 20k, 1/10W, 1%, 0603 NIC, NRC06F2002TRF 20 5 R17, R37, R70, R72, R78 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 21 1 R18 RES, 4.75k, 1/10W, 1%, 0603 VISHAY, CRCW06034K75FKEA 22 1 R19 RES, 10.7k, 1/10W, 1%, 0603 VISHAY, CRCW060310K7FKEA 23 1 R21 RES, 15k, 1/10W, 1%, 0603 NIC, NRC06F1502TRF 24 1 R24 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 25 1 R27 RES, 88.7k, 1/10W, 1%, 0603 VISHAY, CRCW060388K7FKEA 26 1 R36 RES, 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA 27 7 R4, R14, R20, R31, R74, R65, R82 RES, CHIP, 0Ω , 0603 NIC, NRC06ZOTRF 28 1 R76 RES, 34.8k, 1/10W, 1%, 0603 VISHAY, CRCW060334K8FKEA 29 2 R8, R26 RES, 3.32k, 1/10W, 1%, 0603 NIC, NRC06F3321TRF 30 4 R9, R10, R33, R34 RES, 10Ω, 1/10W, 1%, 0603 NIC, NRC06F10R0TRF 31 1 U1 IC, STEP-DOWN CONVERTER LINEAR TECH, LTC3877EUK#PBF Dynamic Load Circuits 1 2 Q21, Q22 MOSFET N-CH 30V 80A D2PAK VISHAY, SUM60N02-3M9P-E3 2 2 R70, R72 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 3 2 R71, R73 RES, 0.002Ω, 1%, 1/2W, 2010 VISHAY, WSL20102L000FEA 8 dc2229af DEMO MANUAL DC2229A Parts List ITEM QTY DC2155A-A REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Demo Board Circuit Components 1 0 C25 CAP, 0805, OPTIONAL 2 0 C7, C16, C20, C21, C22, C23, C24, C26, C27, C28, C29, C32, C34 CAP, 0603, OPTIONAL 3 0 C33 CAP, 1206, OPTIONAL CIN11 CAP, OS-CON, SVP-F8 4 5 0 CIN5–CIN8, CIN12–CIN19 CAP, 1210, OPTIONAL 6 0 COUT11, COUT12, COUT16, COUT17 CAP, 1206, OPTIONAL 7 0 COUT13–COUT15, COUT18–COUT20, COUT21–COUT44 POSCAP, 7343, OPTIONAL D3, D4 DIODE, SOD-323 J7, J8 STUD, TESTPIN, OPTIONAL PEM, KFH-032-10 L3, L4 INDUCTOR WURTH ELEKTRONIK, 744301025 0 Q17–Q20 MOSFET, DUAL N-CHANNEL OPTIONAL INFINEON, BSG0811ND Q23 MOSFET, N-CHANNEL SOT-23 OPTIONAL 13 0 Q5–Q16 MOSFET, N-CHANNEL, POWERPAK OPTIONAL 14 2 R13, R22 RES, CHIP, 0Ω , 0603 8 9 0 10 11 12 NIC, NRC06ZOTRF 15 1 R25 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 16 2 R35, R38 RES., 100k, 1/10W, 1%, 0603 NIC, NRC06F1003TRF 17 0 R1–R3, R5–R7, R11, R23, R29, R30, R32, R39–R58, R63, R64, R66–R68, R69, R75, R77, R80, R81, RN1, RN2 RES, 0603, OPTIONAL 18 0 R79 RES, 0805, OPTIONAL 19 0 R59, R60, R63, R64 RES, 1225, OPTIONAL 20 0 U2 IC, STEP-DOWN CONTROLLER, SLAVE LINEAR TECH., LTC3874IUFD#PBF 21 0 U3 IC, COMPARATOR LINEAR TECH., LT6703IDC-3#PBF Hardware: For Demo Board Only 1 26 E1–E26 TESTPOINT, TURRET, 0.094" MILL-MAX, 2503-2-00-80-00-00-07-0 2 6 J1–J6 RING, LUG #10 KEYSTONE, 8205, #10 3 6 J1–J6 STUD, TEST PIN PEM, KFH-032-10 4 6 J1–J6 WASHER, TIN PLATED BRASS ANY #10 5 12 J1–J6 X (2) NUT, BRASS 10-32 ANY #10-32 6 2 J9, J10 CONN, BNC 5PINS CONNEX, 112404 7 8 JP1–JP7, JP10 HEADER, 3-PIN 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC 8 2 JP8, JP9 HEADER, 4-PIN, 2mm SINGLE ROW SULLINS, NRPN041PAEN-RC dc2229af 9 DEMO MANUAL DC2229A Parts List ITEM QTY DC2155A-B REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2229A-B Required Circuit Components 1 4 CIN1, CIN2, CIN3, CIN4 CAP, 22µF, X5R, 16V, 10%, 1210 MURATA., GRM32ER61C226KE20L 2 2 CIN9, CIN10 CAP, OS-CON, 180µF, 16V, 20%, SVP-F8 PANASONIC, 16SVP180MX 3 4 COUT1, COUT2, COUT6, COUT7 CAP, 220µF, X5R, 4V, 10%, 1206 MURATA., GRM31CR60G227ME11L 4 6 COUT3–COUT5, COUT8–COUT10 CAP, POSCAP, 330µF, 2.5V, 7343 PANASONIC, EEFSX0E331ER 5 5 C1, C4, C6, C8, C14 CAP, 0.1µF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C104K 6 4 C2, C3, C18, C19 CAP, 0.22µF, X7R, 16V, 10%, 0603 AVX, 0603YC224KAT2A 7 2 C5, C17 CAP, 10µF, X5R, 16V, 10%, 0805 AVX, 0805YD106KAT2A 8 1 C9 CAP, 100pF, C0G, 50V, 5%, 0603 AVX, 06035A101JAT2A 9 1 C10 CAP, 3.3nF, X5R, 25V, 10%, 0603 TDK, C0603X5R1E332K 10 1 C11 CAP, 4.7µF, X5R, 16V, 10%, 0805 AVX , 0805YD475KAT2A 11 2 D1, D2 DIODE, SCHOTTKY, SOD-323 CENTRAL SEMI., CMDSH-3TR 12 2 L1, L2 INDUCTOR, 0.25µH WURTH ELEKTRONIK, 744301025 13 2 Q1, Q3 MOSFET N-CH 25V 39A TDSON-8 INFINEON, BSC050NE2LS 14 2 Q2, Q4 MOSFET N-CH 25V 38A TDSON-8 INFINEON, BSC010NE2LSI 15 5 R4, R14, R20, R31, R74 RES, CHIP, 0Ω , 0603 NIC, NRC06ZOTRF 16 2 R8, R26 RES, 3.32k, 1/10W, 1%, 0603 NIC, NRC06F3321TRF 17 2 R9, R10 RES, 10Ω, 1/10W, 1%, 0603 NIC, NRC06F10R0TRF 18 2 R12, R28 RES, 665Ω, 1/10W, 1%, 0603 NIC, NRC06F6650TRF 19 1 R15 RES, 2.2Ω, 1/10W, 1%, 0603 NIC, NRC06F2R20TRF 20 1 R16 RES, 20k, 1/10W, 1%, 0603 NIC, NRC06F2002TRF 21 3 R17, R37, R78 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 22 1 R36 RES, 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA 23 1 R27 RES, 88.7k, 1/10W, 1%, 0603 VISHAY, CRCW060388K7FKEA 24 1 U1 IC, LTC3877EUK#PBF, QFN 7mm x 7mm LINEAR TECH., LTC3877EUK#PBF 25 4 CIN5–CIN8 CAP, 22µF, X5R, 16V, 10%, 1210 MURATA., GRM32ER61C226KE20L 26 1 C21 CAP, 47PF, C0G , 50V, 5%, 0603 MURATA., GRM1885C1H470JA01D 27 2 C23, C27 CAP, 0.22µF, X7R, 10V, 10%, 0603 AVX., 0603ZC224KAT2A 28 1 C25 CAP, 4.7µF, X5R, 16V, 10%, 0805 AVX , 0805YD475KAT2A 29 3 C22, C24, C28 CAP, 0.1µF, X7R, 16V, 10%, 0603 TDK, C0603X7R1C104K 30 6 COUT13–COUT15, COUT18–COUT20 CAP, POSCAP, 330µF, 2.5V, 7343 PANASONIC, EEFSX0E331ER 31 4 COUT11, COUT12, COUT16, COUT17 CAP, 220µF, X5R, 4V, 10% 1206 MURATA., GRM31CR60G227ME11 32 2 Q5, Q7 MOSFET N-CH 25V 39A TDSON-8 INFINEON, BSC050NE2LS 33 2 Q6, Q8 MOSFET N-CH 25V 38A TDSON-8 INFINEON, BSC010NE2LSI 34 1 Q23 MOSFET N-CH 60V 300MA SOT-23 VISHAY, 2N7002K-T1-E3 35 2 L3, L4 INDUCTOR, 0.25µH WURTH ELEKTRONIK., 744301025 36 2 D3, D4 DIODE, SCHOTTKY, SOD-323 CENTRAL SEMI., CMDSH-3TR 37 14 R39, R44, R45, R47, R49, R54, R55, R56, R58, R61, R62, R66–R68 RES, CHIP, 0, 1%, 0603 NIC, NRC06ZOTRF 38 1 R18 RES, 4.02k, 1/10W, 1%, 0603 VISHAY, CRCW06034K02FKEA 39 1 R41 RES, 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA 40 1 R82 RES, 4.22k, 1/10W, 1%, 0603 VISHAY, CRCW06034K22FKEA 10 dc2229af DEMO MANUAL DC2229A Parts List ITEM QTY 41 4 DC2155A-B REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R59, R60, R63, R64 RES, 0, 1%, 1225 TEPRO, RN5326 42 1 R50 RES, 78.7k, 1/10W, 1%, 0603 NIC, NRC06F7872TRF 43 2 R43, R53 RES, 665Ω, 1/10W, 1%, 0603 NIC, NRC06F6650TRF 44 1 R46 RES, 2.2Ω, 1/10W, 1%, 0603 NIC, NRC06F2R20TRF 45 1 R76 RES, 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA 46 1 U1 IC, STEP-DOWN CONVERTER LINEAR TECH, LTC3877EUK#PBF 47 1 U2 IC, STEP-DOWN CONTROLLER, SLAVE LINEAR TECH., LTC3874IUFD#PBF MOSFET N-CH 30V 80A D2PAK VISHAY, SUM60N02-3M9P-E3 Dynamic Load Circuits 1 2 Q21, Q22 2 2 R70, R72 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 3 2 R71, R73 RES, 0.002Ω, 1%, 1/2W, 2010 VISHAY, WSL20102L000FEA Additional Demo Board Circuit Components 1 0 C12, C13, C15 CAP, OPTIONAL 2 0 C20, C29, C32, C7, C16, C34 CAP, OPTIONAL 3 1 C26 CAP, 47nF, X5R, 25V, 10%, 0603 4 0 C33 CAP, 1206, OPTIONAL 5 0 C7, C16, C34 CAP, 0603, OPTIONAL 6 0 CIN11 CAP, OS-CON, SVP-F8 7 0 CIN12–CIN19 CAP, 1210, OPTIONAL 8 0 COUT21–COUT44 POSCAP, 7343, OPTIONAL 9 0 Q17–Q20 MOSFET, DUAL N-CHANNEL OPTIONAL 10 0 Q9–Q16 MOSFET, N-CHANNEL, POWERPAK OPTIONAL RES, CHIP, 0Ω , 0603 AVX., 06033D473KAT2A INFINEON, BSG0811ND 11 2 R13, R22 12 0 R1–R3, R5, R6, R7, R11, R19, R21, R23, R24, RES, OPTIONAL R29, R30, R32, R40, R42, R48, R51, R52, R57, R65, R69, R79, R80, R81, R75, R77, RN1, RN2 NIC, NRC06ZOTRF 13 1 R25 RES, 10k, 1/10W, 1%, 0603 NIC, NRC06F1002TRF 14 2 R33, R34 RES, 10Ω, 1/10W, 1%, 0603 NIC, NRC06F10R0TRF 15 2 R35, R38 RES, 100k, 1/10W, 1%, 0603 NIC, NRC06F1003TRF 16 1 U3 IC, LT6703IDC-3#PBF LINEAR TECH., LT6703IDC-3#PBF Hardware: For Demo Board Only 1 26 E1–E26 TESTPOINT, TURRET, 0.094" MILL-MAX, 2503-2-00-80-00-00-07-0 2 6 J1–J8 RING, LUG #10 KEYSTONE, 8205, #10 3 6 J1–J8 STUD, TESTPIN PEM, KFH-032-10 4 6 J1–J8 WASHER, TIN PLATED BRASS ANY #10 5 12 J1–J8 X (2) NUT, BRASS 10-32 ANY #10-32 6 2 J9, J10 CONN, BNC 5PINS CONNEX, 112404 7 8 JP1–JP7, JP10 HEADER, 3-PIN 0.079 SINGLE ROW SULLINS, NRPN031PAEN-RC 8 2 JP8, JP9 HEADER, 4-PIN, 2mm SINGLE ROW SULLINS, NRPN041PAEN-RC dc2229af 11 A B C JP8 E7 2 3 SGND CLKOUTA 60 DEG 90 DEG 120 DEG E12 E11 3 2 JP9 INTVCCA PHASMD PLLIN BURST FCM PULSE SKIP R25 10K INTVCCA 0 R22 R11 OPT 5 CLKOUTA PHASMD PGOOD2 PGOOD1 VFB2- VFB2+ E13 R38 100K INTVCCA E10 R24 10K R35 100K INTVCCA OPT C16 15K R7 OPT C2 C3 0.22uF 0.22uF R6 OPT PGOOD2 PGOOD1 C19 VID1 VID1 2 VID0 4 E14 EXTVCCA 0.22uF 0.22uF R29 R30 OPT OPT EXTVCCA VFB2- VFB2+ TK/SS2 ITH2 ITH1 C18 DIFFOUT VOSNS1- VOSNS1+ TK/SS1 VFB1 H L ITEMP1 VID1 VID2 VID2 H L VID3 2 VID3 VID4 H L VID3 2 GND R37 10K R36 30.1K INTVCCA E26 VID4 2 C20 OPT EXTVCCA 0 R20 C11 4.7uF 16V 0805 INTVCCA 0 R14 H L 4 Q2 4 VID_EN BG2 4 Q4 4 TG2 C14 0.1uF D2 CMDSH-3 D1 CMDSH-3 C6 0.1uF VID5 2 JP6 H L 2 JP7 3 VID_EN OPT R15 4 BSC010NE2LSI 4 Q3 BSC050NE2LS R75 C8 0.1uF 4 BSC010NE2LSI 4 Q1 BSC050NE2LS 1. ALL RESISTORS ARE 0603. 2. ALL CAPACITORS ARE 0603. 3. INSTALL SHUNTS ON JUMPERS AS SHOWN. 23 24 25 26 27 28 29 30 31 32 33 BG1 TG1 VID5 3 NOTES: UNLESS OTHERWISE SPECIFIED SW2 TG2 BOOST2 BG2 EXTVCC INTVCC VIN BG1 BOOST1 TG1 SW1 CLKOUTA RUN PGOOD2 R27 PGOOD1 88.7K PHASMD MODE_PLLIN FSW = 400kHz H L JP5 U1 LTC3877EUK VID4 INTVCCA CHL_SEL VID_EN VID5 VID2 JP4 SNSA2+ 12 SNSA1+ R32 OPT 11 8 7 10 C15 0.1uF ITH2 ITH1 6 5 R21 R17 10K 4 3 2 1 R5 OPT 9 20K VFB1 C7 OPT R2 OPT C9 100pF R18 C10 3.3nF 4.75K C12 47pF R19 C13 2.2nF 10.7K R16 C4 0.1uF R3 OPT MODE_PLLIN R23 OPT TKSS2 TKSS1 RN1 OPT R13 0 E6 E4 MODE TK/SS2 TK/SS1 RN2 OPT R1 OPT VID0 2 JP3 SNS213 ITEMP1 H L JP2 14 D VID0 JP1 45 GND SNSD2+ 2 1 1 3 44 SNS1- 1 3 VID0 ILIM 15 41 VID1 RUN 16 40 VID2 FREQ 17 2 1 4 1 1 4 43 SNSDC1+ 42 ITEMP1 1 3 18 39 VID3 MODE_PLLIN 38 VID4 PHASMD 19 37 20 35 VID5 PGOOD1 36 1 3 34 VID_EN PGOOD2 21 1 3 1 3 1 3 4 1 2 3 CHL_SEL CLKOUT 22 5 1 2 3 5 1 2 3 5 1 2 3 5 5 R26 3.32K CIN2 22uF 16V 1210 0.25uH 744301025 L2 CIN4 22uF 16V 1210 -B -A R28 665 CIN3 22uF 16V 1210 COUT7 220uF 4V 1206 APPROVALS COUT6 220uF 4V 1206 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. M. SHRIVER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 + COUT3 330uF 2.5V + COUT5 330uF 2.5V R9 10 PRODUCTION VOUT2 COUT4 330uF 2.5V 1 VIN COUT8 330uF 2.5V + + VIN+ GND VO1_SNS- VO1_SNS+ VIN- R34 10 E9 E8 J6 C17 10uF J5 6.3V 0805 VO2_SNS- VO2_SNS+ VOUT2- 1.5V / 30A VOUT2+ NOT STUFFED VOUT_SLAVE VOUT1+ C5 J3 10uF 0.6V - 1.23V / 30A 6.3V 0805 VOUT1J4 E5 E3 E2 J2 IC NO. DATE: JULY 20, 2015 N/A SIZE 1 DC2229A-A SHEET 1 RE V . OF 3 2 HIGH CURRENT STEP-DOWN CONVERTER WITH VID PROGRAMMING AND LOW DCR INDUCTORS LTC3877EUK 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R33 10 COUT10 330uF 2.5V TECHNOLOGY COUT9 330uF 2.5V TITLE: SCHEMATIC + VOUT2 DATE 3-5-15 VIN J1 6V - 14V CIN10 +180uF 16V E1 MIKE S. APPROVED CIN9 +180uF 16V R10 10 DESCRIPTION REVISION HISTORY 1.5V/30A + VOUT1 2 REV 0.6V-1.23V/120A 4 PHASE VOUT1 COUT2 220uF 4V 1206 __ ECO 0.6V-1.23V/30A COUT1 220uF 4V 1206 R4 0 R31 0 R12 665 0.25uH 744301025 L1 R8 3.32K CIN1 22uF 16V 1210 SW1 C1 0.1uF 2 CUSTOMER NOTICE Q12 OPT SW2 Q11 OPT 2.2 Q10 OPT Q9 OPT 1 2 3 5 1 2 3 5 1 2 3 5 12 1 2 3 5 A B C D DEMO MANUAL DC2229A Schematic Diagram dc2229af A B C D FAULT_SLAVE E25 5 3 E15 EXTVCCB R48 OPT OPT Q23 OPT EXTVCCB C26 OPT R47 RUN_SLAVE 2 PGOOD1 TKSS1 1 C27 OPT C23 OPT C21 OPT ITH_SLAVE 8 7 6 5 4 3 2 1 R42 OPT R39 OPT INTVCCB MODE1 ISENSE1+ ISENSE1- RUN1 RUN0 ISENSE0- ISENSE0+ MODE0 R41 OPT INTVCCB 4 R50 OPT 4 R54 OPT R52 INTVCCB OPT CLKOUTA GND SW1 BOOST1 BG1 EXTVCC INTVCC VIN BG0 BOOST0 29 15 16 17 18 19 20 21 R56 OPT R51 OPT INTVCCB EXTVCCB BG4 C29 OPT 4 Q8 4 TG4 D4 OPT D3 OPT C28 OPT 4 4 Q6 BG3 TG3 C22 OPT EXTVCCB OPT R49 C25 OPT 0805 INTVCCB R45 OPT U2 LTC3874IUFD#PBF OPTIONAL 22 FAULT_SLAVE LOWDCR FREQ 10 5 FAULT0B ILIM 11 27 12 26 FAULT1B SYNC 25 PHASMD 13 28 ITH0 ITH1 9 24 TG0 23 SW0 TG1 14 3 5 Q5 OPT OPT 1 2 3 5 Q7 OPT R77 C24 OPT 1 2 3 5 OPT 1 2 3 5 3 1 2 3 R46 R66 OPT VFB2- 4 4 OPT 4 4 5 L4 R57 OPT R53 OPT OPT R55 OPT R44 OPT R69 OPT RUN_SLAVE R62 OPT COUT17 OPT 1206 COUT12 OPT 1206 + + + COUT18 OPT 7343 APPROVALS 2 SCALE = NONE + COUT19 OPT 7343 OPT OPT VOUT_SLAVE- VOUT_SLAVE+ IC NO. DATE: JULY 20, 2015 N/A SIZE 1 DC2229A-A SHEET 2 REV. OF 3 2 HIGH CURRENT STEP-DOWN CONVERTER WITH VID PROGRAMMING AND LOW DCR INDUCTORS LTC3877EUK 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R64 OPT 1225 TECHNOLOGY R63 OPT 1225 TITLE: SCHEMATIC J8 J7 1 VOUT2 VOUT_SLAVE R60 OPT 1225 COUT20 OPT 7343 COUT15 OPT 7343 R59 OPT 1225 + COUT14 OPT 7343 VOUT1 + COUT13 OPT 7343 VOUT_SLAVE CAP-SVP-F8 CIN11 +OPT VIN ITH_SLAVE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE RUN R67 OPT VFB2+ R61 OPT VFB1 ITH1 2 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. M. SHRIVER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TKSS2 R65 0 R68 OPT TKSS1 CHL_SEL R58 OPT INTVCCA ITH2 COUT16 OPT 1206 COUT11 OPT 1206 JUMPERS TO TIE PHASES TOGETHER Q16 OPT CIN7 OPT 1210 CIN6 OPT 1210 CIN8 OPT 1210 OPT L3 R40 OPT R43 OPT CIN5 OPT 1210 SW3 VIN SW4 Q15 OPT OPT Q14 OPT Q13 OPT 1 2 3 5 1 2 3 5 1 2 3 5 1 2 3 FAULT_SLAVE A B C D DEMO MANUAL DC2229A Schematic Diagram 13 dc2229af A B C D + + COUT27 OPT 7343 COUT21 OPT 7343 + COUT39 OPT 7343 + COUT40 OPT 7343 COUT34 OPT 7343 COUT28 OPT 7343 + + + + COUT41 OPT 7343 COUT35 OPT 7343 COUT29 OPT 7343 COUT23 OPT 7343 + + + + COUT24 OPT 7343 COUT30 OPT 7343 COUT36 OPT 7343 COUT42 OPT 7343 + + + + COUT43 OPT 7343 COUT37 OPT 7343 COUT31 OPT 7343 COUT25 OPT 7343 CIN16 OPT 1210 CIN12 OPT 1210 VIN 5 TG3 SW3 CIN17 OPT 1210 TG1 SW1 CIN13 OPT 1210 1 2 3 4 1 2 3 4 8 SW4 4 TG4 1 2 3 7 BG3 CIN19 OPT 1210 1 6 CIN18 OPT 1210 TG2 4 SW3 BG1 5 Q19 BSG0811ND OPT 8 2 3 7 SW2 CIN15 OPT 1210 6 CIN14 OPT 1210 COUT44 OPT 7343 COUT38 OPT 7343 COUT32 OPT 7343 4 SW1 + + + + COUT26 OPT 7343 4 5 Q17 BSG0811ND OPT OPTIONAL DUAL CHANNEL MOSFETS + COUT33 OPT 7343 + + + COUT22 OPT 7343 OPTIONAL COUT VOUT_SLAVE VOUT2 VOUT1 9 10 9 10 9 10 9 10 8 7 6 5 Q20 BSG0811ND OPT 8 7 6 5 Q18 BSG0811ND OPT VOUT1 E18 E16 R70 10k 1% VOUT1 ISTEP1+ R71 E17 LOAD STEP 0.002 2mV / Amp 1% 2010 ISTEP1E19 J9 BG4 SW4 BG2 SW2 GND PULSE GEN2 E22 E20 3 R72 10k 1% Q22 SUM60N02-3m9P TO-263AB E23 E21 C33 OPT 1206 R79 OPT 0805 VIN VOUT2 R81 OPT R80 OPT RUN 2 RUN R78 10.0k R82 0 1 APPROVALS 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. M. SHRIVER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R74 0 RUN RUN_SLAVE LTC3877EUK TECHNOLOGY REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only IC NO. DATE: JULY 20, 2015 N/A SIZE 1 DC2229A-A SHEET 3 OF 3 2 HIGH CURRENT STEP-DOWN CONVERTER WITH VID PROGRAMMING AND LOW DCR INDUCTORS TITLE: SCHEMATIC Use Tepro RN5326 for 0 Ohm, 1225 resistor CIN1-4: Murata GRM32ER61C226KE20L (22uF, 16V, X5R, 1210) CIN9,10: Sanyo 16SVP180MX (180uF, 16V, 30mOhm, 3.0 A RMS) COUT3-5,8-10: Panasonic EEFSX0E331ER (330uF, 9mOhms, 2.5V, 7343) COUT1,2,6,7: Murata GRM31CR60G227M (220uF, 4V, X5R, 1206) L1,2: Wurth 744301025 (250nH, DCR=0.32mOhms +/- 7%, Isat = 65A typical, footprint = 11.3mm X 11mm, H = 8.9mm) Notes to PCB designer: 2 CUSTOMER NOTICE OPT 4 U3 LT6703IDC-3 C32 OPT R76 34.8k VIN OUT VS +INA GND C34 OPT 3 2 1 E24 ISTEP2- ISTEP2+ LOAD STEP 2mV / Amp J10 JP10 ON RUN OFF R73 0.002 1% 2010 VOUT2 DYNAMIC LOAD CIRCUIT FOR VOUT2 GND PULSE GEN1 Q21 SUM60N02-3m9P TO-263AB DYNAMIC LOAD CIRCUIT FOR VOUT1 3 1 14 3 5 A B C D DEMO MANUAL DC2229A Schematic Diagram dc2229af A B C E7 2 3 SGND CLKOUTA 60 DEG 90 DEG 120 DEG E12 E11 3 2 JP9 INTVCCA PHASMD PLLIN BURST FCM PULSE SKIP MODE R25 10K INTVCCA 0 R22 R11 OPT 5 CLKOUTA PHASMD 20K PGOOD2 PGOOD1 VFB2- VFB2+ C15 OPT E13 R17 10K R24 OPT R38 100K R7 OPT VID0 2 C2 C3 PGOOD2 PGOOD1 C19 VID1 VID1 2 VID0 4 E14 EXTVCCA 0.22uF 0.22uF R29 R30 OPT OPT EXTVCCA VFB2- VFB2+ TK/SS2 ITH2 ITH1 C18 DIFFOUT VOSNS1- VOSNS1+ TK/SS1 VFB1 H L ITEMP1 VID1 0.22uF 0.22uF R6 OPT SNSA1+ R32 OPT 11 10 9 8 7 6 5 4 3 2 1 R5 OPT ITH2 ITH1 R35 100K INTVCCA E10 INTVCCA OPT C16 OPT R21 C13 OPT C10 3.3nF VFB1 C7 OPT R2 OPT C9 100pF R18 4.02K C12 OPT R19 OPT R16 C4 0.1uF R3 OPT MODE_PLLIN R23 OPT TKSS2 TKSS1 RN1 OPT R13 0 E6 E4 JP8 TK/SS2 TK/SS1 RN2 OPT R1 OPT ITEMP1 H L JP2 VID2 VID2 H L VID3 VID3 VID4 H L VID3 2 JP4 GND R37 10K R36 30.1K INTVCCA E26 VID4 2 C20 OPT EXTVCCA 0 R20 C11 4.7uF 16V 0805 INTVCCA 0 R14 H L 4 Q2 4 VID_EN BG2 4 Q4 4 TG2 C14 0.1uF D2 CMDSH-3 D1 CMDSH-3 C6 0.1uF VID5 2 JP6 H L R75 2 JP7 3 VID_EN R15 4 BSC010NE2LSI 4 Q3 BSC050NE2LS OPT C8 0.1uF 4 BSC010NE2LSI 4 Q1 BSC050NE2LS 1. ALL RESISTORS ARE 0603. 2. ALL CAPACITORS ARE 0603. 3. INSTALL SHUNTS ON JUMPERS AS SHOWN. 23 24 25 26 27 28 29 30 31 32 33 BG1 TG1 VID5 3 NOTES: UNLESS OTHERWISE SPECIFIED SW2 TG2 BOOST2 BG2 EXTVCC INTVCC VIN BG1 BOOST1 TG1 SW1 CLKOUTA RUN R27 PGOOD2 PGOOD1 88.7K PHASMD MODE_PLLIN FSW = 400kHz H L JP5 U1 LTC3877EUK VID4 INTVCCA CHL_SEL VID_EN VID5 VID2 2 JP3 SNSA2+ 12 D VID0 JP1 45 GND SNS213 2 1 1 3 44 SNS1- 1 3 SNSD2+ 14 41 VID0 ILIM 15 2 1 4 1 1 4 43 SNSDC1+ 42 ITEMP1 VID1 RUN 16 40 1 3 VID2 FREQ 17 39 VID3 MODE_PLLIN 18 38 VID4 PHASMD 19 37 20 35 VID5 PGOOD1 36 1 3 34 VID_EN PGOOD2 21 1 3 1 3 1 3 4 1 2 3 CHL_SEL CLKOUT 22 5 1 2 3 5 1 2 3 5 1 2 3 5 5 R26 3.32K L2 CIN4 22uF 16V 1210 0.25uH 744301025 R28 665 CIN3 22uF 16V 1210 -B -A CIN2 22uF 16V 1210 COUT2 220uF 4V 1206 R31 0 COUT7 220uF 4V 1206 APPROVALS COUT6 220uF 4V 1206 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. M. SHRIVER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 + COUT3 330uF 2.5V __ ECO COUT4 330uF 2.5V 1 COUT8 330uF 2.5V + + VO1_SNS- R34 10 E9 E8 J6 C17 10uF J5 6.3V 0805 VO2_SNS- VO2_SNS+ VOUT2- VOUT2+ IC NO. DATE: JULY 20, 2015 N/A SIZE 1 DC2229A-B SHEET 1 2 REV. OF 3 HIGH CURRENT STEP-DOWN CONVERTER WITH VID PROGRAMMING AND LOW DCR INDUCTORS LTC3877EUK 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only R33 10 GND VINVO1_SNS+ NOT STUFFED COUT10 330uF 2.5V TECHNOLOGY COUT9 330uF 2.5V TITLE: SCHEMATIC + VOUT2 VIN+ D A B VOUT1+ C5 J3 10uF 0.6V - 1.23V / 120A C 6.3V 0805 VOUT1J4 E5 E2 J2 CIN10 +180uF 16V E3 DATE 3-5-15 VIN J1 6V - 14V E1 VOUT_SLAVE COUT5 330uF 2.5V 1.5V/30A + R9 10 VIN MIKE S. APPROVED CIN9 +180uF 16V R10 10 DESCRIPTION REVISION HISTORY PRODUCTION VOUT2 + VOUT1 2 REV 0.6V-1.23V/120A 4 PHASE VOUT1 COUT1 220uF 4V 1206 R4 0 0.6V-1.23V/30A R12 665 0.25uH 744301025 L1 R8 3.32K CIN1 22uF 16V 1210 SW1 C1 0.1uF 2 CUSTOMER NOTICE Q12 OPT SW2 Q11 OPT 2.2 Q10 OPT Q9 OPT 1 2 3 5 1 2 3 5 1 2 3 5 1 2 3 5 DEMO MANUAL DC2229A Schematic Diagram 15 dc2229af A B C D FAULT_SLAVE E25 0 5 EXTVCCB C26 47nF R47 RUN_SLAVE Q23 2N7002 2 PGOOD1 3 E15 EXTVCCB R48 OPT TKSS1 C27 0.22uF C23 0.22uF C21 47pF ITH_SLAVE 8 7 6 5 4 3 2 1 R42 OPT R39 0 INTVCCB MODE1 ISENSE1+ ISENSE1- RUN1 RUN0 ISENSE0- ISENSE0+ MODE0 R41 10K INTVCCB 4 R54 0 R52 OPT CLKOUTA R50 INTVCCB 78.7K GND SW1 BOOST1 BG1 EXTVCC INTVCC VIN BG0 BOOST0 R56 0 R51 OPT C29 OPT EXTVCCB BG4 4 Q8 4 INTVCCB TG4 C28 0.1uF D4 CMDSH-3 R77 D3 CMDSH-3 29 R49 0 C25 4.7uF 0805 INTVCCB EXTVCCB C22 0.1uF 4 4 BG3 TG3 15 16 17 18 19 20 21 R45 0 U2 LTC3874IUFD#PBF OPTIONAL 22 FAULT_SLAVE LOWDCR FREQ 10 1 4 FAULT0B ILIM 11 27 12 26 FAULT1B SYNC 25 PHASMD 28 ITH0 ITH1 9 24 TG0 23 SW0 TG1 13 5 3 BSC010NE2LSI Q6 3 4 4 Q5 BSC050NE2LSI R46 R66 0 VFB2- 4 BSC010NE2LSI 4 Q7 BSC050NE2LSI OPT C24 0.1uF 1 2 3 14 5 1 2 3 5 1 2 3 5 1 2 3 5 5 R53 665 OPT R57 0.25uH 744301025 L4 CIN8 22uF 1210 16V CIN6 22uF 1210 16V 0.25uF 744301025 L3 R55 0 R44 0 R68 0 TKSS1 CHL_SEL R61 0 R62 0 R69 OPT RUN_SLAVE VFB2+ COUT17 220uF 1206 4V COUT12 220uF 1206 + + COUT18 330uF 7343 2.5V COUT13 330uF 7343 2.5V 2 + + J8 J7 1 GND VOUT SCALE = NONE APPROVALS LTC3877EUK TECHNOLOGY IC NO. DATE: JULY 20, 2015 N/A SIZE 1 DC2229A-B SHEET 2 2 REV. OF 3 HIGH CURRENT STEP-DOWN CONVERTER WITH VID PROGRAMMING AND LOW DCR INDUCTORS TITLE: SCHEMATIC 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only RUN AND RUN _SLAVE DRIVEN WITH DIVIDER ON SHEET3. R64 0 1225 VOUT2 VOUT_SLAVE R60 0 1225 COUT20 330uF 7343 2.5V COUT15 330uF 7343 2.5V R63 0 1225 R59 0 1225 COUT19 330uF 7343 2.5V COUT14 330uF 7343 2.5V VOUT1 + + VOUT_SLAVE CAP-SVP-F8 CIN11 +OPT VIN ITH_SLAVE THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE RUN R67 0 VFB1 ITH1 2 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. M. SHRIVER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. TKSS2 R65 OPT R58 0 INTVCCA ITH2 COUT16 220uF 1206 4V COUT11 220uF 1206 JUMPERS TO TIE PHASES TOGETHER Q16 OPT CIN7 22uF 1210 16V R40 OPT R43 665 CIN5 22uF 1210 16V SW3 VIN SW4 Q15 OPT 2.2 Q14 OPT Q13 OPT 1 2 3 5 1 2 3 5 1 2 3 5 16 1 2 3 FAULT_SLAVE A B C D DEMO MANUAL DC2229A Schematic Diagram dc2229af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D + + COUT27 OPT 7343 COUT21 OPT 7343 + COUT39 OPT 7343 + COUT40 OPT 7343 COUT34 OPT 7343 COUT28 OPT 7343 COUT22 OPT 7343 + + + + COUT41 OPT 7343 COUT35 OPT 7343 COUT29 OPT 7343 COUT23 OPT 7343 + + + + COUT24 OPT 7343 COUT30 OPT 7343 COUT36 OPT 7343 COUT42 OPT 7343 + + + + COUT43 OPT 7343 COUT37 OPT 7343 COUT31 OPT 7343 COUT25 OPT 7343 CIN16 OPT 1210 CIN12 OPT 1210 VIN 5 TG3 SW3 CIN17 OPT 1210 TG1 SW1 CIN13 OPT 1210 1 2 3 4 1 2 3 4 8 BG3 4 TG4 1 2 3 7 SW4 CIN19 OPT 1210 1 2 6 CIN18 OPT 1210 TG2 4 SW3 BG1 5 Q19 BSG0811ND OPT 8 7 3 SW2 CIN15 OPT 1210 6 CIN14 OPT 1210 COUT44 OPT 7343 COUT38 OPT 7343 COUT32 OPT 7343 COUT26 OPT 7343 4 SW1 + + + + 4 5 Q17 BSG0811ND OPT OPTIONAL DUAL CHANNEL MOSFETS + COUT33 OPT 7343 + + + OPTIONAL COUT VOUT_SLAVE VOUT2 VOUT1 9 10 9 10 9 10 9 10 8 7 6 5 Q20 BSG0811ND OPT 8 7 6 5 Q18 BSG0811ND OPT VOUT1 E18 E16 R70 10k 1% VOUT1 ISTEP1+ R71 E17 LOAD STEP 0.005 5mV / Amp 1% 2010 ISTEP1E19 J9 BG4 SW4 BG2 SW2 GND PULSE GEN2 E22 E20 3 R72 10k 1% R73 0.005 1% 2010 VOUT2 SUM60N02-3m9P TO-263AB Q22 C33 OPT 1206 R79 OPT 0805 VIN R78 10.0k R82 4.22k APPROVALS R74 0 RUN 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE OPT 4 U3 LT6703IDC-3 C32 OPT R76 30.1k RUN_SLAVE SCALE = NONE LTC3877EUK TECHNOLOGY IC NO. DATE: JULY 20, 2015 N/A SIZE 1 DC2229A-B SHEET 3 OF 3 2 RE V . 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only HIGH CURRENT STEP-DOWN CONVERTER WITH VID PROGRAMMING AND LOW DCR INDUCTORS TITLE: SCHEMATIC Use Tepro RN5326 for 0 Ohm, 1225 resistor CIN1-8: Murata GRM32ER61C226KE20L (22uF, 16V, X5R, 1210) CIN9,10: Sanyo 16SVP180MX (180uF, 16V, 30mOhm, 3.0 A RMS) COUT3-5,8-10,13-15,18-20: Panasonic EEFSX0E331ER (330uF, 9mOhms, 2.5V, 7343) VIN OUT VS +INA GND C34 OPT 3 2 1 E24 1 COUT1,2,6,7,11,12,16,17: Murata GRM31CR60G227M (220uF, 4V, X5R, 1206) L1- 4: Wurth 744301025 (250nH, DCR=0.32mOhms +/- 7%, Isat = 65A typical, footprint = 11.3mm X 11mm, H = 8.9mm) Notes to PCB designer: 2 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. HZ VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. M. SHRIVER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. R81 OPT R80 OPT RUN 2 RUN ISTEP2- ISTEP2+ LOAD STEP 5mV / Amp JP10 ON RUN OFF E23 E21 J10 VOUT2 DYNAMIC LOAD CIRCUIT FOR VOUT2 GND PULSE GEN1 Q21 SUM60N02-3m9P TO-263AB DYNAMIC LOAD CIRCUIT FOR VOUT1 3 1 3 5 A B C D DEMO MANUAL DC2229A Schematic Diagram dc2229af 17 DEMO MANUAL DC2229A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation 18 Linear Technology Corporation dc2229af LT 0815 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015