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SY2147HL-3 Datasheet Figure 7 shows example waveforms for a single switching regulator channel versus a 2-phase LTC1702 system with both sides switching. A single-phase dual regulator with both sides operating would exhibit double the single side numbers. In this example, 2-phase operation reduced the RMS input current from 9.3ARMS (2 x 4.66ARMS) to 4.8ARMS. While this is an impressive reduction in itself, SY2147HL-3 Price . A monolithic power IC with a new structure combining a control block (Bi-CMOS) and a vertical power MOS FET (7rMOS) on a single chip. . One side of load can be grounded to a high-side switch. . Can directly drive a power load from a microprocessor. . Built-in protection against overheating and load shortcircuiting SY2147HL-3 on stock Paralleling Regulators Direct paralleling of regulators is not normally recommend- ed because they do not share currents equally. The regula- tor with the highest reference voltage will supply all the cur- rent to the load until it current limits. With an 18A load, for instance, one regulator might be operating in current limit at 16A while the second device is only carrying 2A. Power dis- sipation in the high current regulator is extremely high with attendant high junction temperatures. Long term reliability cannot be guaranteed under these conditions. Quasi-paralleling may be accomplished if load regulation is not critical. The connection shown in Figure 5a will typically share to within lA, with a worst-case of about 3A. Load regulation is degraded by 150 mV at 20A loads. An external op amp may be used as in Figure 5b to improve load regula- tion and provide remote sensing.
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