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TPS54418RTET Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS54418RTET Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 34 page 300 310 320 330 340 350 360 370 380 390 400 3 3.5 4 4.5 5 5.5 6 V -InputVoltage-V IN T =25°C J 88 90 92 94 96 98 100 102 104 106 108 110 VsenseRising,V =3.3V IN VsenseRising VsenseFalling VsenseFalling -50 -25 0 25 50 75 100 125 150 T -JunctionTemperature-°C J 0 20 40 60 80 100 120 140 160 180 200 -50 -25 0 25 50 75 100 125 150 T -JunctionTemperature-°C J V =3.3V IN OVERVIEW TPS54418 SLVS946 – MAY 2009 ........................................................................................................................................................................................................ www.ti.com TYPICAL CHARACTERISTICS CURVES (continued) SUPPLY CURRENT vs INPUT VOLTAGE PWRGD THRESHOLD vs TEMPERATURE Figure 19. Figure 20. PWRGD ON RESISTANCE vs TEMPERATURE Figure 21. The TPS54418 is a 6-V, 4-A, synchronous step-down (buck) converter with two integrated n-channel MOSFETs. To improve performance during line and load transients the device implements a constant frequency, peak current mode control which reduces output capacitance and simplifies external frequency compensation design. The wide switching frequency of 200 kHz to 2000 kHz allows for efficiency and size optimization when selecting the output filter components. The switching frequency is adjusted using a resistor to ground on the RT/CLK pin. The device has an internal phase lock loop (PLL) on the RT/CLK pin that is used to synchronize the power switch turn on to a falling edge of an external system clock. The TPS54418 has a typical default start up voltage of 2.6 V. The EN pin has an internal pull-up current source that can be used to adjust the input voltage under voltage lockout (UVLO) with two external resistors. In addition, the pull up current provides a default condition when the EN pin is floating for the device to operate. The total operating current for the TPS54418 is 350 µA when not switching and under no load. When the device is disabled, the supply current is less than 5 µA. The integrated 30 m Ω MOSFETs allow for high efficiency power supply designs with continuous output currents up to 4 amperes. 10 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TPS54418 |
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