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LTM8046 Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LTM8046 Datasheet(HTML) 7 Page - Linear Integrated Systems |
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7 / 18 page  LTM8049 7 8049f For more information www.linear.com/LTM8049 TYPICAL PERFORMANCE CHARACTERISTICS CLKOUT2 Duty Cycle vs Temperature Output Ripple, DC2244A Board 800mA Load, 12VIN Measured Across C5, C6 fSW = 1MHz TEMPERATURE (°C) –50 –25 0 25 50 75 100 125 20 40 60 80 8049 G28 PIN FUNCTIONS GND (Bank 1): Tie these GND pins to a local ground plane below the LTM8049 and the circuit components. GND MUST BE CONNECTED EITHER TO VOUTP OR VOUTN FOR PROPER OPERATION. In most applications, the bulk of the heat flow out of the LTM8049 is through these pads, so the printed circuit design has a large impact on the thermal performance of the part. See the PCB Layout and Thermal Considerations sections for more details. Return the feedback divider (RFB) to this net. VIN1, VIN2 (Banks 2, 3): The VINn pins supply current to the LTM8049’s internal regulator and to the internal power switch. This pin must be locally bypassed with an external, low ESR capacitor. VOUT1P, VOUT2P (Banks 4, 5): VOUTnP is the positive out- put of the LTM8049. Apply an external capacitor between VOUTnP and VOUTnN. Tie this net to GND to configure the LMT8049 as a negative output Inverting regulator. VOUT1N, VOUT2N (Banks 6, 7): VOUTnN is the negative out- put of the LTM8049. Apply an external capacitor between VOUTnP and VOUTnN. Tie this net to GND to configure the LTM8049 as a positive output SEPIC regulator. RUN1,RUN2(PinsB7,K7):Thesepinsareusedtoenable/ disable the chip and restart the soft-start sequence. Drive below 1.21V to stop the LTM8049 from switching. Drive above 1.4V to activate the device and restart the soft-start sequence. Do not float this pin. RT1, RT2 (Pins E7, G7): The RTn pins are used to program the switching frequency of the LTM8049 by connecting a resistor from this pin to ground. The switching frequency of the LTM8049 is determined by the equation RTn = (81.6/fOSC)-1,wherethefOSCistheswitchingfrequencyin MHz. This pin must have a resistor to GND. Do not apply a voltage to this pin. SS1, SS2 (Pins C7, J7): Connect a soft-start capacitor from this pin to GND. Upon start-up, the SSn pins will be charged by an internal current source to about 2V. SYNC1, SYNC2 (Pins D7, H7): To synchronize the switch- ingfrequencytoanoutsideclock,simplydrivethispinwith a clock signal. The high voltage level of the clock needs to exceed 1.3V, and the low level must be less than 0.4V. Drive this pin to less than 0.4V to revert to the internal free running clock. Ground these pins if synchronization is not required. See the Applications Information section for more information. 500ns/DIV 12VOUT 50mV/DIV –12VOUT 20mV/DIV 8049 G29 |
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Similar Description - LTM8046 |
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