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LTM4636 Datasheet(PDF) 10 Page - Linear Technology |
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LTM4636 Datasheet(HTML) 10 Page - Linear Technology |
10 / 36 page LTM4636 10 4636f For more information www.linear.com/LTM4636 Decoupling requireMenTs SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS CIN External Input Capacitor Requirement (VIN = 4.70V to 16V, VOUT = 1.5V) IOUT = 40A, 6 × 22µF Ceramic X7R Capacitors (See Table 4) 100 µF COUT External Output Capacitor Requirement (VIN = 4.70V to 16V, VOUT = 1.5V) IOUT = 40A (See Table 4) 1000 µF TA = 25°C. Use Figure 1 configuration. Power Module Description TheLTM4636isahighefficiencyregulatorthatcanprovide a40Aoutputwithfewexternalinputandoutputcapacitors. This module provides precisely regulated output voltages programmable via external resistors from 0.6V DC to 3.3V DC over a 4.70V to 15V input range. The Typical Applica- tion schematic is shown in Figure 20. The LTM4636 has an integrated constant-frequency cur- rent mode regulator, power MOSFETs, 0.18µH inductor, protection circuitry, 5V regulator and other supporting discrete components. The switching frequency range is from250kHzto770kHz,andthetypicaloperatingfrequency is 400kHz. For switching noise-sensitive applications, it can be externally synchronized from 250kHz to 800kHz, subject to minimum on-time limitations and limiting the inductor ripple current to less than 40% of maximum output current. A single resistor is used to program the frequency. See the Applications Information section. With current mode control and internal feedback loop compensation, the LTM4636 module has sufficient stabil- ity margins and good transient performance with a wide range of output capacitors, even with all ceramic output capacitors. An option has been provided for external loop compensation. LTpowerCAD® can be used to optimize the external compensation option. See the Applications Information section. Current mode control provides cycle-by-cycle fast current limit in an overcurrent condition. An internal overvoltage operaTion monitor feedback pin referred will attempt to protect the output voltage in the event of an overvoltage >10%. The top MOSFET is turned off and the bottom MOSFET is turned on until the output is cleared. Pulling the RUNC pin below 1.1V forces the regulator con- trollerintoashutdownstate.TheTRACK/SSpinisusedfor programmingtheoutputvoltagerampandvoltagetracking during start-up. See the Applications Information section. The LTM4636 is internally compensated to be stable over all operating conditions. Table 5 provides a guideline for input and output capacitances for several operating condi- tions. LTpowerCAD is available for transient and stability analysis. This tool can be used to optimize the regulators loop response. Aremotesenseamplifierisprovidedforaccuratelysensing output voltages at the load point. Multiphase operation can be easily employed with the internal clock source or a synchronization clock applied to the MODE/PLLIN input using an external clock source, and connecting the CLKOUT pins. See the Applications Information section. Review Figure 4. High efficiency at light loads can be accomplished with selectable Burst Mode operation using the MODE_PLLIN pin. These light load features will accommodate battery operation. Efficiency graphs are provided for light load op- erationintheTypicalPerformanceCharacteristicssection. A TEMP+ and TEMP– pins are provided to allow the internal device temperature to be monitored using an onboard diode connected NPN transistor. |
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