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LM2648MTD 数据表(PDF) 1 Page - National Semiconductor (TI) |
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LM2648MTD 数据表(HTML) 1 Page - National Semiconductor (TI) |
1 / 23 page LM2648 Two-Phase, Synchronous Step-Down 3-Channel Switching Regulator Controller General Description The LM2648 consists of two current mode and two voltage mode synchronous buck regulator controllers providing 3 outputs at a switching frequency of 300kHz. Each pair of 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 current mode regulator outputs operate as a dual- phase, single output regulator for high current applications. Current-mode feedback control on Channel 3 assures supe- rior line and load regulation and wide loop bandwidth as- sures excellent response to fast load transients. Channels 1 and 2 employ voltage-mode feedback control. The LM2648 features analog soft-start circuitry that is inde- pendent of the output load and output capacitance. This makes the soft-start behavior more predictable than tradi- tional soft-start circuits. Sequential startup is built in and requires a single capacitor to set the timing. The LM2648 has over-voltage protection and under-voltage protection for all outputs. Two additional comparator inputs (analog and logic level) are provided to shut down the IC for any user defined protection. The FAULT_DELAY pin allows delayed shut off time for the IC during an under-voltage or PROT-IN2 fault. The LM2648 also features an adjustable UVLO feature. Features n Four synchronous buck regulators n Channel 3: Two-phase, current mode controller n 4.5V to 18V input range n Built in sequential startup n Channels 1 and 2: Independent, 180˚ out of phase voltage mode controllers n Single soft start for channels 1 and 2 n Adjustable cycle-by-cycle current limit for each channel n Adjustable reference current n Adjustable input under-voltage lockout n Output over-voltage latch protection n Output under-voltage protection with delay n Two comparator inputs for user defined protection - one 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 Interactive Games n Set-top Boxes/Home Gateways Block Diagram 20059690 December 2004 © 2004 National Semiconductor Corporation DS200596 www.national.com |
类似零件编号 - LM2648MTD |
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类似说明 - LM2648MTD |
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