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LTM4618 Datasheet(PDF) 9 Page - Linear Technology |
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LTM4618 Datasheet(HTML) 9 Page - Linear Technology |
9 / 24 page LTM4618 9 4618f OPERATION Power Module Description The LTM4618 is a standalone non-isolated switching mode DC/DC power supply. It can deliver up to 6A (DC current) output with few external input and output capacitors. This module provides precisely regulated output voltages pro- grammable 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 21. For ≤6V inputs, connect VIN, INTVCC and EXTVCC together. The LTM4618 has an integrated constant frequency current mode regulator and built-in power MOSFET devices with fast switching speed. The typical switching frequency is 750kHz. With current mode control and internal feedback loop compensation, the LTM4618 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. Pull- ing the RUN pin below 1.1V forces the controller into its shutdown state, by turning off both MOSFETs. The TK/SS pin can be used for programming the output voltage ramp and voltage tracking during start-up. See the Applications Information section. The LTM4618 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 control. High efficiency at light loads can be accomplished with selectable Burst Mode or pulse-skipping mode operations using the MODE/PLLIN pin. Efficiency graphs are provided for light load operation in the Typical Performance Char- acteristics section. |
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