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LTM4650 Datasheet(PDF) 10 Page - Linear Technology |
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LTM4650 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 36 page  LTM4650-1 10 46501fc For more information www.linear.com/LTM4650-1 operaTion Power Module Description The LTM4650-1 is a dual-output standalone nonisolated switchingmodeDC/DCpowersupplywith±0.8%(A-Grade) total DC output error over line, load and temperature varia- tion.Itcanprovidetwo25Aoutputswithfewexternalinput andoutputcapacitorsandsetupcomponents.Thismodule providespreciselyregulatedoutputvoltagesprogrammable via external resistors from 0.6VDC to 1.8VDC over 4.5V to 15V input voltages. The typical application schematic is shown in Figure 24. The LTM4650-1 has dual integrated constant-frequency current mode regulators and built-in power MOSFET devices with fast switching speed. The typical switching frequency is from 400kHz to 600kHz depending on output voltage. For switching-noise sensitive applications, it can be externally synchronized from 400kHz to 780kHz. A resistor can be used to program a free run frequency on the FSET pin. See the Applications Information section. With current mode control, the LTM4650-1 module has sufficient stability margins and good transient perfor- mance with a wide range of output capacitors, even with all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limitandfoldbackcurrentlimitinanovercurrentcondition. Internal overvoltage and undervoltage comparators pull the open-drain PGOOD outputs low if the output feedback voltage exits a ±10% window around the regulation point. As the output voltage exceeds 10% above regulation, the bottom MOSFET will turn on to clamp the output voltage. ThetopMOSFETwillbeturnedoff.Thisovervoltageprotect is feedback voltage referred. Pulling the RUN pins below 1.1V forces the regulators into ashutdownstate,byturningoffbothMOSFETs.TheTRACK pinsareusedforprogrammingtheoutputvoltagerampand voltage tracking during start-up or used for soft-starting the regulator. See the Applications Information section. The LTM4650-1 has a built-in 10pF high frequency filter cap from COMP to SGND for each output. An external RC filtering circuit is required to achieve fast Type II control loop compensation. Table 4 provides a guide line for input, output capacitances and RC comp values for several oper- ating conditions. The Linear Technology µModule Power Design Tool (LTpowerCAD®) will be provided for transient and stability analysis. The VFB pin is used to program the output voltage with a single external resistor to ground. A differential remote sense amplifier is available for sens- ing the output voltage accurately on one of the outputs at the load point, or in parallel operation sensing the output voltage at the load point. Multiphase operation can be easily employed with the MODE_PLLIN, PHASMD, and CLKOUT pins. Up to 12 phases can be cascaded to run simultaneously with respect to each other by programming the PHASMD pin to different levels. See the Applications Information section. High efficiency at light loads can be accomplished with selectable Burst Mode operation or pulse-skipping opera- tion using the MODE_PLLIN pin. These light load features will accommodate battery operation. Efficiency graphs are providedforlightloadoperationintheTypicalPerformance Characteristics section. See the Applications Information section for details. A general purpose temperature diode is included inside the module to monitor the temperature of the module. See the Applications Information section for details. The switch pins are available for functional operation monitoring and a resistor-capacitor snubber circuit can be careful placed on the switch pin to ground to dampen any high frequency ringing on the transition edges. See the Applications Information section for details. |
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