SNVAA32 july   2023 LMQ64480-Q1 , LMQ644A0-Q1 , LMQ644A2-Q1

 

  1.   1
  2.   LMQ644A2-Q1 6-Phase Buck Regulator Design for Automotive ADAS Applications
  3.   Trademarks
  4. 1 Introduction
    1. 1.1 Features and Electrical Performance
  5. 2Design Specifications
  6. 3Application Circuit Diagram and Operating Configuration Table
  7. 4Top and Bottom Board Views
  8. 5Test Data and Performance Curves
    1. 5.1 Conversion Efficiency
    2. 5.2 Operating Waveforms
      1. 5.2.1 6-phase Switching
      2. 5.2.2 Load Transient Response
      3. 5.2.3 Loop Response
      4. 5.2.4 Startup/Shutdown
    3. 5.3 Thermal Performance
    4. 5.4 CISPR 25 EMI Performance
  9. 6EVM Documentation
    1. 6.1 Schematic
    2. 6.2 Bill of Materials
    3. 6.3 PCB Layout
  10. 74-Phase Configuration
    1. 7.1 4-Phase Switching
  11. 8Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
    2. 8.2 Documentation Support
      1. 8.2.1 References
        1. 8.2.1.1 PCB Layout Resources
        2. 8.2.1.2 Thermal Design Resources

6.2 Bill of Materials

Table 6-1 Bill of Materials
COUNT REF DES DESCRIPTION PART NUMBER MFR
6 C1, C2, C3, C4, C5, C9 CAP, CERM, 4.7 µF, 50 V,+/- 10%, X7R, 1206 C3216X7R1H475K160AE TDK
9 C6, C7, C11, C12, C24, C25, C57, C67, C68 CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0402 GCM155R71H104KE02D MuRata
3 C8, C38, C56 CAP, CERM, 1 uF, 16 V, +/- 20%, X7R, AEC-Q200 Grade 1, 0603 GCM188R71C105MA64D MuRata
6 C10, C13, C22, C23, C27, C33 CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0603 CGA3E2X7R1H104K080AA TDK
24 C14, C15, C16, C17, C28, C29, C30, C31, C34, C35, C36, C37, C41, C42, C43, C44, C46, C47, C48, C49, C52, C53, C54, C55 CAP, CERM, 47 uF, 10 V,+/- 20%, X7R, 1210 LMK325B7476MM-TR Taiyo Yuden
2 C18, C32 CAP, CERM, 1 uF, 25 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0603 GCM188R71E105KA64D MuRata
1 C19 CAP, CERM, 0.1 uF, 16 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0603 GCM188R71C104KA37J MuRata
3 C20, C39, C50 CAP, CERM, 0.1 uF, 50 V, +/- 10%, X5R, 0603 C1608X5R1H104K080AA TDK
1 C21 CAP, CERM, 10 pF, 100 V, +/- 5%, C0G/NP0, 0603 GRM1885C2A100JA01D MuRata
1 C26 CAP, CERM, 4700 pF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0603 GCM188R71H472KA37D MuRata
3 C58, C61, C62 CAP, CERM, 2.2 uF, 35 V, +/- 10%, X7R, 0805 C2012X7R1V225K085AC TDK
1 C69 CAP, AL, 100 uF, 100 V, +/- 20%, AEC-Q200 Grade 2, SMD MAL215099907E3 Vishay-Bccomponents
1 CFB_FF Cap Ceramic 22pF 100V C0G 5% Pad SMD 0603 125C Automotive T/R GCM1885C2A220JA16D Murata Electronics North America
1 FB1 Chip Ferrite Bead Array, 1206, 50Ω @ 100MHz, 0.0016Ω, 25%, 12A BLM31SN500SH1L Murata
8 H1, H2, H3, H4 Standoff, Hex, 0.5"L #4-40 Nylon 1902C Keystone
8 H5, H6, H7, H8 Screw, Pan Head , 4-40, 3/8", Nylon NY PMS 440 0038 PH B&F Fastener Supply
4 J1, J2, J4, J8 Header, 100mil, 3x1, Gold, TH PBC03SAAN Sullins Connector Solutions
1 J3 Header, 100mil, 2x1, Gold, TH TSW-102-07-G-S Samtec
7 J5, J6, J7, J11, J12, J13, J14 Header, 2.54mm, 2x1, Tin, TH TSW-102-23-T-S Samtec
1 J10 Header, 100mil, 5x1, Gold, TH HTSW-105-07-G-S Samtec
6 L1, L2, L3, L4, L5, L6 Shielded Power Inductors 3.3uH 20% tol, 6.5mOhm 16.6A XGL6060-332MEC Coilcraft
1 L7 Inductor, Shielded E Core, Ferrite, 1 uH, 16.3 A, 0.004 ohm, SMD SER1052-102MLB Coilcraft
1 R1 RES, 49.9, 1%, 0.125 W, AEC-Q200 Grade 0, 0805 CRCW080549R9FKEA Vishay-Dale
9 R2, R3, R4, R8, R10, R13, R16, R18, R23 RES, 0, 0%, 0.25 W, AEC-Q200 Grade 0, 0603 PMR03EZPJ000 Rohm
7 R5, R9, R11, R15, R17, R19, R21 RES, 100 k, 1%, 0.1 W, 0603 RC0603FR-07100KL Yageo
3 R6, R12, R22 RES, 39.0 k, 0.1%, 0.1 W, 0603 RG1608P-393-B-T5 Susumu Co Ltd
1 R7 RES, 6.49 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 CRCW06036K49FKEA Vishay-Dale
2 R14, R24 RES, 41.2 k, 1%, 0.1 W, 0603 RC0603FR-0741K2L Yageo
1 R20 RES, 220 k, 1%, 0.1 W, 0603 RC0603FR-07220KL Yageo
1 R25 RES, 93.1 k, 1%, 0.1 W, 0603 RC0603FR-0793K1L Yageo
1 R26 RES, 29.4 k, 0.1%, 0.1 W, 0603 RT0603BRD0729K4L Yageo America
1 RFB_B RES, 32.0 k, 0.1%, 0.1 W, 0603 RT0603BRD0732KL Yageo America
1 RFB_T RES, 68.0 k, 1%, 0.1 W, 0603 RC0603FR-0768KL Yageo
11 SYNC_OUT_T, TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP9, TP11, VCC_T Test Lead clips and hooks, SMT S1751-46 Harwin
4 T1, T2, T3, T4 Terminal 70A Lug CXS70-14-C Panduit
3 U1, U2, U3 LMQ644A2-Q1 3-V to 36-V, 12A, Low Iq dual buck converter LMQ644A2QRXARQ1 Texas Instruments