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LTM4603HV Datasheet(PDF) 10 Page - Linear Technology |
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LTM4603HV Datasheet(HTML) 10 Page - Linear Technology |
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10 / 26 page  LTM4603HV 10 4603hvfa For more information www.linear.com/LTM4603HV operaTion Power Module Description The LTM4603HV is a standalone nonisolated switching mode DC/DC power supply. It can deliver up to 6A of DC output current with few external input and output capaci- tors.Thismoduleprovidespreciselyregulatedoutputvolt- ageprogrammableviaoneexternalresistorfrom0.6VDCto 5.0VDC over a 4.5V to 28V wide input voltage. The typical application schematic is shown in Figure 20. The LTM4603HV has an integrated constant on-time current mode regulator, ultralow RDS(ON) FETs with fast switching speed and integrated Schottky diodes. The typi- cal switching frequency is 1MHz at full load. With current mode control and internal feedback loop compensation, the LTM4603HV module has sufficient stability margins and good transient performance 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 limit. Besides, foldback current limiting is provided in an overcurrent condition while VFB drops. Internal overvolt- age 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 Q1 is turned off and bottom FET Q2 is turned on and held on until the overvoltage condition clears. Pulling the RUN pin below 1V forces the controller into its shutdown state, turning off both Q1 and Q2. At low load current, the module works in continuous current mode by default to achieve minimum output voltage ripple. When 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 powerlossintheinternallinearregulator.Thisisespecially true at the higher input voltage range. The LTM4603HV has a very accurate differential remote sense amplifier with very low offset. This provides for very accurate output voltage sensing at the load. The MPGM pin, MARG0 pin and MARG1 pin are used to sup- port voltage margining, where the percentage of margin is programmed by the MPGM pin, and the MARG0 and MARG1 select margining. The PLLIN pin provides frequency synchronization of the device to an external clock. The TRACK/SS pin is used for power supply tracking and soft-start programming. |
Similar Part No. - LTM4603HV_15 |
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Similar Description - LTM4603HV_15 |
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