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LM26 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM26 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 20 page  LM2642 Two-Phase Synchronous Step-Down Switching Controller General Description The LM2642 consists of two current mode synchronous buck regulator controllers with a switching frequency of 300kHz. The two switching regulator controllers operate 180˚ out of phase. This feature reduces the input ripple RMS current, thereby significantly reducing the required input capacitance. The two switching regulator outputs can also be paralleled to operate as a dual-phase single output regulator. The output of each channel can be independently adjusted from 1.3 to V IN• maximum duty cycle. An internal 5V rail is also available externally for driving bootstrap circuitry. Current-mode feedback control assures excellent line and load regulation and a wide loop bandwidth for excellent response to fast load transients. Current is sensed across either the Vds of the top FET or across an external current- sense resistor connected in series with the drain of the top FET. Current limit is independently adjustable for each chan- nel. The LM2642 features analog soft-start circuitry that is inde- pendent of the output load and output capacitance. This makes the soft-start behavior more predictable and control- lable than traditional soft-start circuits. A PGOOD1 pin is provided to monitor the dc output of channel 1. Over-voltage protection is available for both out- puts. A UV-Delay pin is also available to allow delayed shut off time for the IC during an output under-voltage event. Features n Two synchronous buck regulators n 180˚ out of phase operation n 4.5V to 30V input range n Power good function monitors Ch.1 n 37µA Shutdown current n 0.04% (typical) line and load regulation error n Current mode control with or without a sense resistor n Independent enable/soft-start pins allow simple sequential startup configuration. n Configurable for single output parallel operation. (See Figure 2). n Adjustable cycle-by-cycle current limit n Input under-voltage lockout n Output over-voltage latch protection n Output under-voltage protection with delay n Thermal shutdown n Self discharge of output capacitors when the regulator is OFF n TSSOP package Applications n Embedded computer systems n High end gaming systems n Set-top boxes n WebPAD Block Diagram 20046201 May 2003 © 2003 National Semiconductor Corporation DS200462 www.national.com |
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