SC2738 Semtech Corporation, SC2738 Datasheet
SC2738
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SC2738 Summary of contents
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... POWER MANAGEMENT Description The SC2738 is an ultra low output voltage dual power supply controller designed to simplify power management for desktop PCs and graphics cards part of Semtech’s Smart LDO family of products. The SC2738 has two TM user adjustable outputs that can be set anywhere be- tween 0 ...
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... SC2738 www.DataSheet4U.com PRELIMINARY ...
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... SC2738 www.DataSheet4U.com ...
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... SC2738 www.DataSheet4U.com PRELIMINARY ...
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... POWER MANAGEMENT Block Diagram 2004 Semtech Corp. (0.94 VBG at start-up) 5 SC2738 www.DataSheet4U.com (0.94 VBG at start-up) www.semtech.com ...
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... POWER MANAGEMENT Applications Infomation Theory Of Operation The SC2738 dual linear FET controller provides a simple way to drive two N-channel MOSFETs to produce tightly regulated output voltages from one or two available, higher, supply voltages. It takes its power from either 12V supply, drawing typically 500µA while operating ...
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... OUT DRAIN OUT DS(ON) If the supply to the SC2738 IN pin comes up before the supply to the MOSFET drain, then that output should be enabled as the supply to the MOSFET drain is applied - the Power Good signal for this rail would be ideal. If the power supply to the MOSFET drain comes up before the ...
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... DS(ON Table 1: Recommended Resistor Values For SC2738 Design Example Goal: 1.5V±5% static and ±7% transient @ from 2.5V±5% and 5V±5% Total window for DC error and ripple is ±75mV. Total window for transient is ±105mV. Since this device is linear, and assuming that it has been designed to not ever enter dropout not have ripple on the output ...
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... I OUT ( MAX ) Obviously 12V rail is available to power the SC2738, the number of FET options increases dramatically. 2004 Semtech Corp. Layout Guidelines The advantages of using the SC2738 to drive external MOSFETs are a) that the bandgap reference and control circuitry are in a die that does not contain high power ...
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... Drive Pin Output Current (Sourcing) at Startup vs. Junction Temperature vs. Input Voltage < V ADJ TH(PGD 100 125 -50 -25 10 SC2738 www.DataSheet4U.com PRELIMINARY vs. Input Voltage = 12V 100 T (°C) J vs. Junction Temperature ...
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... Power Good Logic Low Output Voltage 200 175 V = 0.4V ADJ I = -1mA PGD 150 125 100 100 125 -50 -25 11 SC2738 www.DataSheet4U.com V = 12V 100 T (°C) J vs. Junction Temperature = 100 T (°C) J vs. Junction Temperature ...
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... 0.01A to 2.51A to 0.01A OUT 100µF, 25m OUT R = 20m DROOP Trace 1: V OUT Trace 2: not connected Trace 3: 1.2V in, 50mV/div., offset 1V Trace 4: load FET drain Timebase: 20µs/div. Load rise/fall times 12 SC2738 www.DataSheet4U.com PRELIMINARY , 20mV/div., offset 1V /µs 35A www.semtech.com ...
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... SEE DETAIL SIDE VIEW AND - DETERMINED AT DATUM PLANE -H- DIMENSIONS DIM INCHES (.161 .098 .020 X .011 Y .063 Z .224 Y Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 13 SC2738 www.DataSheet4U.com MILLIMETERS NOM MAX - - .043 1.10 - .006 0.00 0.15 - .037 0.75 0.95 .011 0.17 - 0.27 - .009 0.08 0.23 .122 2.90 3.00 3 ...