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LTM4620A Datasheet(PDF) 11 Page - Linear Technology |
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LTM4620A Datasheet(HTML) 11 Page - Linear Technology |
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11 / 40 page  LTM4620A 11 4620afb For more information www.linear.com/LTM4620A OPERATION Power Module Description The LTM4620A is a dual-output standalone nonisolated switching mode DC/DC power supply. It can provide two 13A outputs with few external input and output capacitors and setup components. This module provides precisely regulated output voltages programmable via external resistors from 0.6VDC to 5.3VDC over 4.5V to 16V input voltages. The typical application schematic is shown in Figure 26. See Note 8 in the Electrical Characteristics section for output current guideline. TheLTM4620Ahasdualintegratedconstant-frequencycur- rent mode regulators and built-in power MOSFET devices with fast switching speed. The typical switching frequency is 500kHz. 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 and internal feedback loop compensation, the LTM4620A module has sufficient stability margins and good transient performance 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. TheLTM4620Aisinternallycompensatedtobestableover all operating conditions. Table 5 provides a guide line for input and output capacitances for several operating condi- tions. LTpowerCAD™ is available for transient and stability analysis. The VFB pin is used to program the output volt- age with a single external resistor to ground. A differential remote sense amplifier is available for sensing 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 re- spect to each other by programming the PHMODE 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 pin. These light load features will accommodate battery operation. Efficiency graphs are providedforlightloadoperationintheTypicalPerformance Characteristics section. See the Applications Information section for details. A TEMP pin is provided to allow the internal device tem- peraturetobemonitoredusinganonboarddiodeconnected PNP transistor. This diode connected PNP transistor is grounded in the module and can be used as a general temperature monitor using a device that is designed to monitor the single-ended connecton. |
Similar Part No. - LTM4620A_15 |
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Similar Description - LTM4620A_15 |
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