SC2463 Semtech, SC2463 Datasheet
SC2463
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SC2463 Summary of contents
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... POWER MANAGEMENT Description The SC2463 is a high performance controller for multi- output converters that can be configured for a wide vari- ety of applications. The SC2463 utilizes PWM synchro- nous buck topologies where efficiency is most important. It also provides two dedicated programmable positive linear regulators using external transistors. Each of the four outputs is adjustable down to 0.5V. The two PWM switchers are synchronized 180° ...
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... > > SC2463 www.DataSheet4U.com < T < < T < < ...
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... ° SC2463 www.DataSheet4U.com = T = -40°C to 105° ...
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... SC2463 www.DataSheet4U.com = T = -40°C to 105° ...
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... Notes: (1) Guaranteed by design. (2) This device is ESD sensitive. Use of standard ESD handling precautions is required. 2007 Semtech Corp SC2463 www.DataSheet4U.com = T = -40°C to 105° www.semtech.com ...
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... POWER MANAGEMENT Pin Configuration Top View (28 Pin TSSOP) Marking Information TOP SC2463 TS yyww xxxxxx nnnn = Part Number (Example: 1406) yyww = Date Code (Example: 0012) xxxxx = Semtech Lot No. (Example: P94A01) 2007 Semtech Corp. Ordering Information ...
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... POWER MANAGEMENT Block Diagram 2007 Semtech Corp. 9 SC2463 www.DataSheet4U.com SS/SHDN www.semtech.com ...
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... POWER MANAGEMENT Applications Information The SC2463 is designed to control and drive two N-Chan- nel MOSFET PWM synchronous buck switchers and two positive linear regulators. The two PWM switchers are synchronized 180° out of phase for low input ripple and noise. The switching frequency is programmable to opti- mize design ...
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... Minimum Switc Minimum Switc Minimum Switch On Time Consideration Minimum Switc In the SC2463, the falling edge of the clock turns on the top MOSFET. The inductor current and the sensed voltage ramp up. After the internal ramp voltage crosses a threshold determined by the error amplifier output, ...
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... POWER MANAGEMENT Applications Information (Cont.) There will not be enough modulation headroom if the on time is simply made equal to the minimum on time of the SC2463. For ease of control, we recommend the required pulse width least 1.5 times the minimum on time nductor (L) and Ripple Current ...
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... where R electrolytic capacitors, and R capacitance of the ceramic capacitors respectively. (Figure 2) . esr Req and Ceq are both functions of frequency. For rigorous 13 SC2463 www.DataSheet4U.com ceramic capacitor ...
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... The two step-down channels of the SC2463 operate at 180 degrees from each other. If both step- down channels in the SC2463 are connected in parallel, both the input and the output RMS currents will be reduced. Ripple cancellation effect of interleaving allows the use of smaller input capacitors ...
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... The conduction losses are then R varies with temperature and gate-source voltage. ds(on) Curves showing R manufacturers’ data sheet. From the Si4860 datasheet, R than 10V. However R and junction temperature increases from 25 ds(on The switching losses can be estimated using the simple formula 15 SC2463 www.DataSheet4U.com 100 Rds ( ) , Cg 200 Rds ( ) 20 , ...
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... The switching loss . g is negligible due to near zero-voltage switching. is The gate losses are estimated The total bottom switch losses are then . = dissipated SC2463 www.DataSheet4U.com is the total gate charge ...
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... Therefore, as the current falls back below the thresh- old the next almost full cycle. The peak cur- rent is not controlled and only depends upon circuit pa- rameters and operating condition in this cycle. The peak current SC2463 www.DataSheet4U.com ) ...
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... Loop Compensation Loop Compensation Loop Compensation Loop Compensation SC2463 is a voltage mode buck controller with high gain bandwidth error amplifier utilizing external network com- pensation to regulate output voltage. For a DC/DC converter usually required that the converter has a loop gain of a high crossover frequency ...
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... Maximize the trace width of the loop connecting the inductor, bottom MOSFET and the output capacitors. 9. Connect the ground of the feedback divider and the compensation components directly to the GND pin of the SC2463 by using a separate ground trace. Then connect this pin to the ground of the output capacitor as close as possible. 1 ...
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... POWER MANAGEMENT Evaluation Board Schematic 2007 Semtech Corp. VIN ILIM1 27 1 BDI ILIM2 28 14 PVCC PGND 22 21 AVCC AGND SC2463 www.DataSheet4U.com www.semtech.com ...
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... Sanyo 680pF 4.7nF 22uF 2.2nF 100pF SL04 Vishay 10uH Coilcraft Zetex Vishay Zetex 10K 10 30K 2 11.5K 0 180 1K 20K 2.05K 40.2K 18K 150 2.0K 14K 51K Semtech Corp. 21 SC2463 www.DataSheet4U.com Part # C3216X5R1C106MT 4TPB680M C3216X5R1C106MT C4532X5R0J107MT 6TPB470M SL04 DO5022P-103 FZT749TA SUD50N03-10CP FZT649 SC2463 www.semtech.com ...
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... SWITCHER1 LOAD TRANSIENT SWITCHER1 LOAD TRANSIENT SWITCHER1 LOAD TRANSIENT 200US/DIV A: CH1 LOAD CURRENT, 0.25A/US, 0.5A/DIV C: CH2 OUTPUT VOLTAGE, 50MV/DIV OVERCURRENT PROTECTION OVERCURRENT PROTECTION OVERCURRENT PROTECTION OVERCURRENT PROTECTION OVERCURRENT PROTECTION 10US/DIV A: CH1 PH1 VOLTAGE, 10V/DIV B: CH1 INDUCTOR CURRENT, 2A/DIV 22 SC2463 www.DataSheet4U.com www.semtech.com ...
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... AND - DETERMINED AT DATUM PLANE DIM INCHES (.222 .161 .026 X .016 Y .061 Y Z .283 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 23 SC2463 www.DataSheet4U.com DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX - - .047 - - 1. .002 .006 0.05 0. ...