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LTM4676A Arkusz danych(PDF) 23 Page - Linear Technology |
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LTM4676A Arkusz danych(HTML) 23 Page - Linear Technology |
23 / 136 page LTM4676A 23 4676afa For more information www.linear.com/LTM4676A operaTion Table 1 provides a summary of LTM4676A’s supported PMBuscommands,aswellasadirectcomparisontothose of the LTM4676. For details on the supported commands, payloads and data formats see Appendix C: PMBus Com- mand Details. For introductory information about the PMBus Specifica- tion, see Appendix A: Similarity Between PMBus, SMBus and I2C 2-Wire Interface. For information about the data communication link layer and timing diagrams, see Ap- pendix B: PMBus Serial Digital Interface. Major features of the LTM4676A strictly from a DC/DC converter power delivery point of view are as follows: n Up to 13A Output Current Delivery from Each of Two Integrated Power Stages (See Front Page Figure)—or Up to 26A Output, Combined (See Figure 35 and Figure 42). n Wide Input Voltage Range: DC/DC Step-Down Con- version from 5.75V to 26.5V Input (See Figure 69). n DC/DCStep-DownConversionfrom4.5Vto5.75VInput, Connecting SVIN to INTVCC (See Figure 35). n DC/DCStep-DownConversionPossiblefromLessThan 4.5V Input When an Auxiliary 5V Bias Supply Powers SVIN and INTVCC (See Figure 37). n Output Voltage Range: 0.5V to 5.5V on both VOUT0 and VOUT1. n Differential Remote Sensing of VOUT0 (VOSNS0+/ VOSNS0–). For paralleled outputs, the VOSNS0+/VOSNS0– pin-pair can be configured as the feedback path for both VOUT0 and VOUT1 (see Figure 42 and, optionally, MFR_PWM_CONFIG[7]). n Start-Up Into a Pre-Biased Load Without Sinking Current. n Four LTM4676As Can Be Paralleled to Deliver Up to 100A (See Figure 39). n OneLTM4676ACanBeParalleledwithThreeLTM4620A or LTM4630 Modules to Deliver Up to 130A; Infer Rail Status and Telemetry of Paralleled LTM4620A or LTM4630 via the Sole LTM4676A (See Figure 40). n Discontinuous Mode Operation Available for Higher Light-Load Efficiency (MFR_PWM_MODEn[0]). n Output Current Limit and Overvoltage Protection. n Three Integrated Temperature Sensors, Over/Under- temperature Protection. n Constant Frequency Peak Current Mode Control. n Configurable Switching Frequency, 250kHz to 1MHz; Synchronizable to External Clock; Seven Configurable Channel Phase Interleaving Settings. n Internal Loop Compensation Provided; External Loop Compensation Can Be Applied, if Preferred. n Integrated Snubber Capacitors Enable EMI Reduction by Placing External Snubber Resistors Adjacent to the Module (see Figures 32 and 33). n Low Profile (16mm × 16mm × 5.01mm) BGA Package PowerSolutionRequiresOnlyInputandOutputCapaci- tors; at Most, Nine Pull-Up Resistors for Open-Drain Digital Signals; at Most, Six Pull-Down Resistors to Configure All Possible Pin-Strapping Options. Features of the LTM4676A that enable power system management, rail sequencing, and fault monitoring and reporting are as follows: n I2C-basedPMBus/SMBus2-WireSerialCommunication Interface (SDA, SCL) with ALERT Interrupt Pin, SCL Clock Capable of 400kHz Bus Communication Speeds with Clock Low Extending—or 100kHz, Otherwise. n Configurable Output Voltage. n Configurable Input Undervoltage Comparators (UVLO Rising, UVLO Falling). n Configurable Switching Frequency. n Configurable Current Limit. n Configurable Output Over/Undervoltage Comparators. n Configurable Turn-On and Turn-Off Delay Times. n Configurable Output Ramp Rise and Fall Times. n Non-Volatile Configuration Memory (NVM EEPROM) with ECC to Configure Aforementioned Settings, and More—Yielding Standalone Operation, if Desired, and |
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