Datasheet LTM4619 (Analog Devices) - 8

LTM4619
operaTion
The LTM4619 is a dual-output standalone non-isolated Internal overvoltage and undervoltage comparators pull switching mode DC/DC power supply. It can deliver up to the open-drain PGOOD output low if the output feedback 4A (DC current) for each output with few external input and voltage exits a ±7.5% window around the regulation point. output capacitors. This module provides precisely regulated The power good pin is disabled during start-up. output voltages programmable via external resistors from Pulling the RUN pin below 1.2V forces the controller into 0.8VDC to 5.0VDC over 4.5V to 26.5V input voltages. The its shutdown state, by turning off both MOSFETs. The typical application schematic is shown in Figure 19. TK/SS pin is used for programming the output voltage The LTM4619 has integrated constant frequency current ramp and voltage tracking during start-up. See the Ap- mode regulators and built-in power MOSFET devices with plications Information section. fast switching speed. The typical switching frequency is The LTM4619 is internally compensated to be stable over 780kHz. To reduce switching noise, the two outputs are all operating conditions. LTpowerCAD™ is available for interleaved with 180° phase internally and can be synchro- transient and stability analysis. The V nized externally using the MODE/PLLIN pin. FB pin is used to program the output voltage with a single external resistor With current mode control and internal feedback loop to ground. Multiphase operation can be easily employed compensation, the LTM4619 module has sufficient stabil- with the synchronization. ity margins and good transient performance with a wide High efficiency at light loads can be accomplished with range of output capacitors, even with all ceramic output selectable Burst Mode operation or pulse-skipping mode capacitors. using the MODE/PLLIN pin. Efficiency graphs are provided Current mode control provides cycle-by-cycle fast current for light load operations in the Typical Performance Char- limit and current foldback in a short-circuit condition. acteristics section. 4619fc 8 For more information www.linear.com/LTM4619 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 Photograph Related Parts Design Resources