Datasheet LTC7810 (Analog Devices) - 38
| Manufacturer | Analog Devices |
| Description | 150V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller with PassThru |
| Pages / Page | 42 / 38 — TYPICAL APPLICATIONS. LTC7810. Figure 16. High Efficiency Four Phase … |
| Revision | A |
| File Format / Size | PDF / 4.0 Mb |
| Document Language | English |
TYPICAL APPLICATIONS. LTC7810. Figure 16. High Efficiency Four Phase Single Output 12V/75A (900W) Step-Down Regulator
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LTC7810
TYPICAL APPLICATIONS
DRV V CC1 IN V 18V TO 60V IN V D1 IN (48V NOMINAL) C C IN2 IN1 4.7µF 47µF RUN1 BOOST1 MTOP1 ×6 TG1 RUN2 ×2 L1 0.1µF 6.8µH SW1 DRVCC1 DRVCC NDRV MBOT1
LTC7810
BG1 ×2 4.7µF PGND 10Ω SENSE1+ 1nF 3mΩ VFB2 MODE SENSE1– DRVSET EXTVCC INTVCC1 INTVCC SENSE2– COUT1 COUT2 1nF 3mΩ 110k 22µF 330µF 0.1µF 10Ω ×6 ×2 SENSE2+ VFB1 DRVCC1 CLK1 VIN 10k PLLIN/SPREAD D2 SS TRACK/SS1 ITH BOOST2 MTOP2 ITH1 TG2 ×2 FREQ L2 REGSD 0.1µF 3.74k 100pF 6.8µH ITH2 SW2 TRACK/SS2 MBOT2 10nF 42.2k OVLO SGND BG2 ×2 VOUT CLK1 DRV 12V/75A CC2 INTVCC1 V+ OUT1 VIN V 0.1µF IN LTC6908-2 D3 CLK2 V C IN C IN4 442k GND OUT2 IN3 4.7µF BOOST1 47µF RUN1 MTOP3 ×6 TG1 RUN2 ×2 L3 SET MOD 0.1µF 6.8µH SW1 DRVCC2 DRVCC MBOT3 NDRV
LTC7810
BG1 ×2 4.7µF PGND 10Ω SENSE1+ 1nF 3mΩ VFB2 MODE SENSE1– DRVSET EXTVCC INTVCC2 INTVCC SENSE2– COUT3 COUT4 1nF 3mΩ 110k 22µF 330µF 0.1µF 10Ω ×6 ×2 SENSE2+ VFB1 DRVCC2 CLK2 VIN 10k PLLIN/SPREAD D4 SS TRACK/SS1 ITH BOOST2 MTOP4 ITH1 TG2 ×2 FREQ L4 REGSD 0.1µF 6.8µH ITH2 SW2 0.1µF 100pF TRACK/SS2 42.2k OVLO BG2 SGND MBOT4 ×2 7810 F16 fSW = 225kHz MTOP1,2,3,4: INFINEON BSC340N08NS3 CIN1,CIN3: SUN 100CE47LX MBOT1,2,3,4: INFINEON BSC042NE7NS3 CIN2,CIN4: TDK CGA6M3X7S2A475M200AB D1,2,3,4: CENTRAL SEMI CMDP3003 COUT1,COUT3: MURATA GRM32ER71E226ME15L L1,2,3,4: COILCRAFT SER2918H-682KL COUT2,COUT4: SUN 25HVH330M
Figure 16. High Efficiency Four Phase Single Output 12V/75A (900W) Step-Down Regulator
Rev. A 38 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Main Control Loop Power and Bias Supplies (VIN, NDRV, EXTVCC, DRVCC, REGSD) Boost Supply and Dropout (BOOST and SW pins) Start-Up and Shutdown (RUN, TRACK/SS, OVLO Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Applications Information Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Sensing Setting the Operating Frequency Selecting the Light-Load Operating Mode Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pins and Overvoltage/Undervoltage Lockout Tracking and Soft-Start (TRACK/SS1, TRACK/SS2 Pins) Single Output Two-Phase Operation DRVCC Regulators Topside MOSFET Driver Supply (CB, DB) Burst Clamp Programming Fault Conditions: Current Limit and Current Foldback Fault Conditions: Overvoltage Protection (Crowbar) Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL APPLICATIONS
DRV V CC1 IN V 18V TO 60V IN V D1 IN (48V NOMINAL) C C IN2 IN1 4.7µF 47µF RUN1 BOOST1 MTOP1 ×6 TG1 RUN2 ×2 L1 0.1µF 6.8µH SW1 DRVCC1 DRVCC NDRV MBOT1
LTC7810
BG1 ×2 4.7µF PGND 10Ω SENSE1+ 1nF 3mΩ VFB2 MODE SENSE1– DRVSET EXTVCC INTVCC1 INTVCC SENSE2– COUT1 COUT2 1nF 3mΩ 110k 22µF 330µF 0.1µF 10Ω ×6 ×2 SENSE2+ VFB1 DRVCC1 CLK1 VIN 10k PLLIN/SPREAD D2 SS TRACK/SS1 ITH BOOST2 MTOP2 ITH1 TG2 ×2 FREQ L2 REGSD 0.1µF 3.74k 100pF 6.8µH ITH2 SW2 TRACK/SS2 MBOT2 10nF 42.2k OVLO SGND BG2 ×2 VOUT CLK1 DRV 12V/75A CC2 INTVCC1 V+ OUT1 VIN V 0.1µF IN LTC6908-2 D3 CLK2 V C IN C IN4 442k GND OUT2 IN3 4.7µF BOOST1 47µF RUN1 MTOP3 ×6 TG1 RUN2 ×2 L3 SET MOD 0.1µF 6.8µH SW1 DRVCC2 DRVCC MBOT3 NDRV
LTC7810
BG1 ×2 4.7µF PGND 10Ω SENSE1+ 1nF 3mΩ VFB2 MODE SENSE1– DRVSET EXTVCC INTVCC2 INTVCC SENSE2– COUT3 COUT4 1nF 3mΩ 110k 22µF 330µF 0.1µF 10Ω ×6 ×2 SENSE2+ VFB1 DRVCC2 CLK2 VIN 10k PLLIN/SPREAD D4 SS TRACK/SS1 ITH BOOST2 MTOP4 ITH1 TG2 ×2 FREQ L4 REGSD 0.1µF 6.8µH ITH2 SW2 0.1µF 100pF TRACK/SS2 42.2k OVLO BG2 SGND MBOT4 ×2 7810 F16 fSW = 225kHz MTOP1,2,3,4: INFINEON BSC340N08NS3 CIN1,CIN3: SUN 100CE47LX MBOT1,2,3,4: INFINEON BSC042NE7NS3 CIN2,CIN4: TDK CGA6M3X7S2A475M200AB D1,2,3,4: CENTRAL SEMI CMDP3003 COUT1,COUT3: MURATA GRM32ER71E226ME15L L1,2,3,4: COILCRAFT SER2918H-682KL COUT2,COUT4: SUN 25HVH330M
Figure 16. High Efficiency Four Phase Single Output 12V/75A (900W) Step-Down Regulator
Rev. A 38 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Main Control Loop Power and Bias Supplies (VIN, NDRV, EXTVCC, DRVCC, REGSD) Boost Supply and Dropout (BOOST and SW pins) Start-Up and Shutdown (RUN, TRACK/SS, OVLO Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Applications Information Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Sensing Setting the Operating Frequency Selecting the Light-Load Operating Mode Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pins and Overvoltage/Undervoltage Lockout Tracking and Soft-Start (TRACK/SS1, TRACK/SS2 Pins) Single Output Two-Phase Operation DRVCC Regulators Topside MOSFET Driver Supply (CB, DB) Burst Clamp Programming Fault Conditions: Current Limit and Current Foldback Fault Conditions: Overvoltage Protection (Crowbar) Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Applications Package Description Revision History Typical Application Related Parts
