LM3075 Datasheet | National Semiconductor

Description The LM3075 is a current mode control, synchronous buck controller IC. Use of synchronous rectification and pulseskipping operation at light load achieves high efficiency over a wide load range. Fixed frequency operation can be obtained by disabling the pulse-skipping mode. Current mode control assures excellent line and load regulation and a wide loop bandwidth for fast response to load transients. .. Current mode control can be achieved by either sensing across the high side NFET or a sense resistor. The switching frequency can be selected as either 200 k Hz or 300 k Hz from an internal clock. The LM3075 is available with an adjustable output in a TSSOP-20 package. Features n n n n n Input voltage range of 4.5V-36V Current Mode Control Skip mode operation available Cycle by cycle current limit 1.24V ± 2% Reference Applications n Automotive Power Supplies n Distributed Power Systems Typical Application Circuit © 2005 National Semiconductor Corporation DS201623 .national. Connection Diagram TOP VIEW 20-Lead TSSOP (MTC) Ordering Information Order Number LM3075MTC .. LM3075MTCX Package Type TSSOP-20 TSSOP-20 NSC Package Drawing MTC-20 MTC-20 Supplied As 73 Units per Anti-Static Tube 2500 Units on Tape and Reel Pin Descriptions LM3075 Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name VLIN5 VIN EXT FS EN FB FPWM P SS AGND PGND LDRV VDD CBOOT HDRV SW CSL CSH ILIM PGOOD Function 5V linear regulator output Input voltage supply External power connection for VLIN5 Frequency select Enable pin Feedback pin Forced PWM selection pensation pin Output enable / soft-start pin Analog ground Power ground Low side gate drive Low side gate drive supply Bootstrap capacitor connection High side gate drive Switch node Current sense low Current sense high Current limit threshold adjustment Power good flag .national. Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact...