Datasheet LTM4601, LTM4601-1 (Analog Devices) - 10

LTM4601/LTM4601-1
operaTion Power Module Description
Pulling the RUN pin below 1V forces the controller into its The LTM4601 is a standalone nonisolated switching mode shutdown state, turning off both Q1 and Q2. At low load DC/DC power supply. It can deliver up to 12A of DC output current, the module works in continuous current mode by current with some external input and output capacitors. default to achieve minimum output ripple voltage. This module provides a precisely regulated output voltage When DRVCC pin is connected to INTVCC an integrated programmable via one external resistor from 0.6VDC to 5V linear regulator powers the internal gate drivers. If a 5.0VDC over a 4.5V to 20V wide input voltage. The typical 5V external bias supply is applied on the DRVCC pin, then application schematic is shown in Figure 18. an efficiency improvement will occur due to the reduced The LTM4601 has an integrated constant on-time current power loss in the internal linear regulator. This is especially mode regulator, ultralow R true at the high end of the input voltage range. DS(ON) FETs with fast switch- ing speed and integrated Schottky diodes. The typical The LTM4601 has a very accurate differential remote switching frequency is 850kHz at full load. With current sense amplifier with very low offset. This provides for mode control and internal feedback loop compensation, very accurate output voltage sensing at the load. The the LTM4601 module has sufficient stability margins and MPGM pin, MARG0 pin and MARG1 pin are used to sup- good transient performance under a wide range of operat- port voltage margining, where the percentage of margin ing conditions and with a wide range of output capacitors, is programmed by the MPGM pin, and the MARG0 and even all ceramic output capacitors. MARG1 select margining. Current mode control provides cycle-by-cycle fast current The PLLIN pin provides frequency synchronization of the limit. Besides, foldback current limiting is provided in an device to an external clock. The TRACK/SS pin is used overcurrent condition while VFB drops. Internal overvolt- for power supply tracking and soft-start programming. 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. 4601fe 10 For more information www.linear.com/LTM4601 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photo Related Parts