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LTM4606MPV Datasheet(PDF) 9 Page - Linear Technology |
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LTM4606MPV Datasheet(HTML) 9 Page - Linear Technology |
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9 / 24 page  LTM4606 9 4606f OPERATION Power Module Description The LTM4606 is a standalone non-isolated switching mode DC/DC power supply. It can deliver up to 6A of DC output current with some external input and output capacitors. This module provides precisely regulated output voltage programmable via one external resistor from 0.6VDC to 5.0VDC over a 4.5V to 28V input voltage range. The typical application schematic is shown in Figure 20. The LTM4606 has an integrated constant on-time current mode regulator, ultralow RDS(ON) FETs with fast switching speed and integrated Schottky diodes. The typical switch- ing frequency is 800kHz. With current mode control and internal feedback loop compensation, the LTM4606 module has sufficient stability margins and good transient per- formance under a wide range of operating conditions and with a wide range of output capacitors, even all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limiting. Besides, foldback current limiting is provided in an overcurrent condition while VFBdrops.Internalovervoltage and undervoltage comparators pull the open-drain PGOOD output low if the output feedback voltage exits a ±10% window around the regulation point. Furthermore, in an overvoltage condition, internal top FET M1 is turned off and bottom FET M2 is turned on and held on until the overvoltage condition clears. Input filter and noise cancellation circuits reduce the noise coupling to I/O sides, and ensure the electromagnetic interference (EMI) to meet the limits of CISPR 22 and CISPR 25. Pulling the RUN pin below 1V forces the controller into its shutdown state, turning off both M1 and M2. At low load currents, discontinuous mode (DCM) operation can be enabled to achieve higher efficiency compared to continuous mode (CCM) by setting the FCB pin higher than 0.6V. When the DRVCC pin is connected to INTVCC an integrated 5V linear regulator powers the internal gate drivers. If a 5V external bias supply is applied on the DRVCC pin, then an efficiency improvement will occur due to the reduced power loss in the internal linear regulator. This is especially true at the higher input voltage range. The MPGM, MARG0, and MARG1 pins are used to sup- port voltage margining, where the percentage of margin is programmed by the MPGM pin, and the MARG0 and MARG1 selected margining. The PLLIN pin provides fre- quency synchronization of the device to an external clock. The TRACK/SS pin is used for power supply tracking and soft-start programming. |
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