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LM3743MM-1000 Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM3743MM-1000 Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 23 page Connection Diagram 20177402 10-Lead Plastic MSOP NS Package Number MUB10A Top View Ordering Information Order Number Frequency Option Top Mark NSC Package Drawing Supplied As LM3743MM-300 300 kHz SKPB MUB10A 1000 units in Tape and Reel LM3743MMX-300 300 kHz SKPB MUB10A 3500 units in Tape and Reel LM3743MM-1000 1 MHz SKNB MUB10A 1000 units in Tape and Reel LM3743MMX-1000 1 MHz SKNB MUB10A 3500 units in Tape and Reel Pin Descriptions VCC (Pin 1) Supply rail for the controller section of the IC. A minimum capacitance of 1 µF, preferably a multi-layer ce- ramic capacitor type (MLCC), must be connected as close as possible to the V CC and GND pin anda1to 4.99 Ω resistance must be connected in series from the supply rail to the Vcc pin. See VCC FILTERING in the Design Consid- eration section for further details. LGATE (Pin 2) Gate drive for the low-side N-channel MOS- FET. This signal is interlocked with HGATE to avoid a shoot- through problem. GND (Pin 3) Power ground (PGND) and signal ground (SGND). Connect the bottom feedback resistor between this pin and the feedback pin. ILIM (Pin 4) Low side current limit threshold setting pin. This pin sources a fixed 50 µA current. A resistor of appropriate value should be connected between this pin and the drain of the low-side N-FET. FB (Pin 5) Feedback pin. This is the inverting input of the error amplifier used for sensing the output voltage and com- pensating the control loop. COMP/EN (Pin 6) Output of the error amplifier and enable pin. The voltage level on this pin is compared with an inter- nally generated ramp signal to determine the duty cycle. This pin is necessary for compensating the control loop. Forcing this pin to ground will shut down the IC. SS/TRACK (Pin 7) Soft-start and tracking pin. This pin is connected to the non-inverting input of the error amplifier during initial soft-start, or any time the voltage is below the reference. To track the rising ramp of another power supply’s output, connect a resistor divider from the output of that supply to this pin as described in Application Information. SW (Pin 8) Switch pin. The lower rail of the high-side N-FET driver. Also used for the high side current limit sensing. HGATE (Pin 9) Gate drive for the high-side N-channel MOS- FET. This signal is interlocked with LGATE to avoid a shoot- through problem. BOOT (Pin 10) Supply rail for the N-channel MOSFET high gate drive. The voltage should be at least one gate threshold above the regulator input voltage to properly turn on the high-side N-FET. See MOSFET Gate Drivers in the Applica- tion Information section for more details on how to select MOSFETs. www.national.com 2 |
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