Datasheet LTM4606 (Analog Devices) - 10

LTM4606
operaTion Power Module Description
Input filter and noise cancellation circuits reduce the noise The LTM4606 is a standalone non-isolated switching mode coupling to I/O sides, and ensure the electromagnetic DC/DC power supply. It can deliver up to 6A of DC output interference (EMI) to meet EN55022 Class B limits. current with some external input and output capacitors. Pulling the RUN pin below 1V forces the controller into its This module provides precisely regulated output voltage shutdown state, turning off both M1 and M2. At low load programmable via one external resistor from 0.6VDC to currents, discontinuous mode (DCM) operation can be 5.0VDC over a 4.5V to 28V input voltage range. The typical enabled to achieve higher efficiency compared to continu- application schematic is shown in Figure 20. ous mode (CCM) by setting the FCB pin higher than 0.6V. The LTM4606 has an integrated constant on-time current When the DRVCC pin is connected to INTVCC an integrated mode regulator, ultralow RDS(ON) FETs with fast switch- 5V linear regulator powers the internal gate drivers. If a ing speed and integrated Schottky diodes. With current 5V external bias supply is applied on the DRVCC pin, then mode control and internal feedback loop compensation, an efficiency improvement will occur due to the reduced the LTM4606 module has sufficient stability margins and power loss in the internal linear regulator. This is especially good transient performance under a wide range of operat- true at the higher input voltage range. ing conditions and with a wide range of output capacitors, even all ceramic output capacitors. The MPGM, MARG0 and MARG1 pins are used to sup- port voltage margining, where the percentage of margin Current mode control provides cycle-by-cycle fast current is programmed by the MPGM pin, and the MARG0 and limiting. Besides, foldback current limiting is provided in MARG1 selected margining. The PLLIN pin provides fre- an overcurrent condition while VFB drops. Internal over- quency synchronization of the device to an external clock. voltage and undervoltage comparators pull the open-drain The TRACK/SS pin is used for power supply tracking and PGOOD output low if the output feedback voltage exits a soft-start programming. ±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. 4606fd 10 For more information www.linear.com/LTM4606 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Revision History Package Photograph Related Parts