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LTM4619EV Datasheet(PDF) 8 Page - Linear Technology |
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LTM4619EV Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTM4619 8 4619f OPERATION The LTM4619 is a dual-output standalone non-isolated switching mode DC/DC power supply. It can deliver up to 4A (DC current) for each output with few external input and output capacitors. This module provides precisely regulated output voltages programmable via external resistors from 0.8VDC to 5.0VDC over 4.5V to 26.5V input voltages. The typical application schematic is shown in Figure 18. The LTM4619 has integrated constant frequency current mode regulators and built-in power MOSFET devices with fast switching speed. The typical switching frequency is 780kHz. To reduce switching noise, the two outputs are interleaved with 180° phase internally and it can be syn- chronized externally using the PLLIN pin. With current mode control and internal feedback loop compensation, the LTM4619 module has sufficient stabil- ity margins and good transient performance with a wide range of output capacitors, even with all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limit and current foldback in a short-circuit condition. Internal overvoltage and undervoltage comparators pull the open-drain PGOOD output low if the output feedback voltage exits a ±7.5% window around the regulation point. The power good pin is disabled during start-up. Pulling the RUN pin below 1.2V forces the controller into its shutdown state, by turning off both MOSFETs. The TK/SS pin is used for programming the output voltage ramp and voltage tracking during start-up. See the Applications Information section. The LTM4619 is internally compensated to be stable over all operating conditions. The Linear Technology μModule Power Design Tool will be provided for transient and stability analysis. The VFB pin is used to program the output voltage with a single external resistor to ground. Multiphase operation can be easily employed with the synchronization. High efficiency at light loads can be accomplished with selectable Burst Mode operation or pulse-skipping mode using the MODE pin. Efficiency graphs are provided for light load operations in the Typical Performance Charac- teristics section. |
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