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LTM4600 Datasheet(PDF) 8 Page - Linear Technology |
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LTM4600 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 24 page  LTM4600 8 4600fa OPERATIO µModule Description The LTM4600 is a standalone non-isolated synchronous switching DC/DC power supply. It can deliver up to 10A of DC output current with only bulk external input and output capacitors. This module provides a precisely regulated output voltage programmable via one external resistor from 0.6VDC to 5.0VDC, not to exceed 80% of the input voltage. The input voltage range is 4.5V to 20V. A simplified block diagram is shown in Figure 1 and the typical application schematic is shown in Figure 17. The LTM4600 contains an integrated LTC constant on-time current-mode regulator, ultra-low RDS(ON) FETs with fast switching speed and integrated Schottky diode. The typical switching frequency is 800kHz at full load. With current mode control and internal feedback loop compensation, the LTM4600 module has sufficient stability margins and good transient performance under a wide range of operat- ing conditions and with a wide range of output capacitors, even all ceramic output capacitors (X5R or X7R). Current mode control provides cycle-by-cycle fast current limit. In addition, foldback current limiting is provided in an over-current condition while VFB drops. Also, the LTM4600 has defeatable short circuit latch off. Internal overvolt- 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. Pulling the RUN/SS pin low forces the controller into its shutdown state, turning off both Q1 and Q2. Releasing the pin allows an internal 1.2µA current source to charge up the softstart capacitor. When this voltage reaches 1.5V, the controller turns on and begins switching. At low load current the module works in continuous cur- rent mode by default to achieve minimum output voltage ripple. It can be programmed to operate in discontinuous current mode for improved light load efficiency when the FCB pin is pulled up above 0.8V and no higher than 6V. The FCB pin has a 4.75k resistor to ground, so a resistor to VIN can set the voltage on the FCB pin. When EXTVCC pin is grounded or open, an integrated 5V linear regulator powers the controller and MOSFET gate drivers. If a minimum 4.7V external bias supply is ap- plied on the EXTVCC pin, the internal regulator is turned off, and an internal switch connects EXTVCC to the gate driver voltage. This eliminates the linear regulator power loss with high input voltage, reducing the thermal stress on the controller. The maximum voltage on EXTVCC pin is 6V. The EXTVCC voltage should never be higher than the VIN voltage. Also EXTVCC must be sequenced after VIN. |
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