Datasheet LTM4601HV (Analog Devices) - 10

LTM4601HV
OPERATION Power Module Description
in an overvoltage condition, internal top FET Q1 is turned The LTM4601HV is a standalone nonisolated switching off and bottom FET Q2 is turned on and held on until the mode DC/DC power supply. It can deliver up to 12A of overvoltage condition clears. DC output current with some external input and output Pulling the RUN pin below 1V forces the controller into its capacitors. This module provides a precisely regulated shutdown state, turning off both Q1 and Q2. At low load output voltage programmable via one external resistor current, the module works in continuous current mode by from 0.6VDC to 5.0VDC over a 4.5V to 28V wide input default to achieve minimum output voltage ripple. voltage. The typical application schematics are shown in When DRV Figures 19 and 20. CC pin is connected to INTVCC an integrated 5V linear regulator powers the internal gate drivers. If a The LTM4601HV has an integrated constant on-time 5V external bias supply is applied on the DRVCC pin, then current mode regulator, ultralow RDS(ON) FETs with fast an efficiency improvement will occur due to the reduced switching speed and integrated Schottky diodes. The typical power loss in the internal linear regulator. This is especially switching frequency is 850kHz at full load. With current true at the high end of the input voltage range. mode control and internal feedback loop compensation, The LTM4601HV has a very accurate differential remote the LTM4601HV module has sufficient stability margins sense amplifier with very low offset. This provides for very and good transient performance under a wide range of accurate output voltage sensing at the load. The MPGM operating conditions and with a wide range of output pin, MARG0 pin and MARG1 pin are used to support capacitors, even all ceramic output capacitors. voltage margining, where the percentage of margin is Current mode control provides cycle-by-cycle fast current programmed by the MPGM pin, and MARG0 and MARG1 limit. Besides, foldback current limiting is provided in an select margining. overcurrent condition while VFB drops. Internal overvolt- The PLLIN pin provides frequency synchronization of the age and undervoltage comparators pull the open-drain device to an external clock. The TRACK/SS pin is used PGOOD output low if the output feedback voltage exits a for power supply tracking and soft-start programming. ±10% window around the regulation point. Furthermore, 4601hvfb 10 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photos Related Parts