SC1545 查看數據表（PDF） - Semtech Corporation
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SC1545 Datasheet PDF : 8 Pages
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500mA SmartLDOTM With Power Up
Signal Sequencing
PRELIMINARY - January 17, 2000
TYPICAL CHARACTERISTICS (Cont.)
VDO Current Limit vs.
Junction Temperature
1000
VO = 0V
900
800
700
600
500
400
300
200
100
0
0
25
50
75
100
125
TJ (°C)
SC1545
TIMING DIAGRAMS
Power up signal sequencing is shown in Figure 1. BF_CUT, PDR and NDR follow the power rails up to their final
values. SLP goes to its high value when the power rails have stabilized, ~25msec after power on. BF_CUT is
pulled low a period T1 after SLP goes high. T1 can be as short as 1msec. Typical measured values are
~200msec. The 2.5V LDO output stays OFF through this sequence.
© 2000 SEMTECH CORP.
Figure 1: Power Up Signal Sequencing
6
652 MITCHELL ROAD NEWBURY PARK CA 91320
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