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LTM8048 Datasheet(PDF) 8 Page - Linear Technology |
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LTM8048 Datasheet(HTML) 8 Page - Linear Technology |
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8 / 20 page  LTM8049 8 8049fa For more information www.linear.com/LTM8049 PIN FUNCTIONS FBX1, FBX2 (Pins C1, J1): If configured as a SEPIC, the LTM8049 regulates its FBX pin to 1.204V. Apply a resis- tor between FBX and VOUTP. Its value should be RFB = [(VOUTP – 1.204)/0.0833]k. If the LTM8049 is configured as an inverting converter, the LTM8049 regulates the FBX pin to 7mV. Apply a resistor between FBX and VOUTN of value RFB = [(|VOUTN| + 0.007)/0.0833]k. The LTM8049 features frequency foldback to protect the power switches during a fault or output current overload. During start-up, frequency foldback also limits the current the LTM8049 delivers to the load. The user must evaluate the start-up behavior of the LTM8049 to ensure that it properly pow- ers up the load. PG1, PG2 (Pins D6, H6): These active high pins indicates that the FBn pin voltage for the corresponding channel is within 4% of its regulation voltage These open drain outputs requires a pull-up resistor to indicate power good. Also, the status of these pins is valid only when RUN > 1.4V and VIN > 2.6V. CLKOUT1, CLKOUT2 (Pins E6, G6): Use these pins to synchronize devices to either channel of the LTM8049. ThesepinsoscillateatthesamefrequencyastheLTM8049 internal oscillator or, if active, the SYNC pin. The CLKOUT1 signal is about 180° out of phase with the oscillator of channel1anddutycycleisabout50%.TheCLKOUT2signal is in phase with the internal oscillator of channel 2 and its duty cycle varies linearly with the internal temperature of the LTM8049. Please refer to the Applications Information section for detailed information on using CLKOUT2 as an indication of the LTM8049 internal temperature. Do not apply a voltage to this pin or use this pin to drive capaci- tive loads greater than 120pF. SHARE1, 2 (pins F3, F4): Connect these pins together if the two outputs of the LTM8049 are paralleled. Otherwise, leave these pins floating. |
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