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ADM1085AKSZ-REEL7 Arkusz danych(PDF) 11 Page - Analog Devices |
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ADM1085AKSZ-REEL7 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 16 page ADM1085/ADM1086/ADM1087/ADM1088 Rev. A | Page 11 of 16 APPLICATION INFORMATION SEQUENCING CIRCUITS The ADM1085/ADM1086/ADM1087/ADM1088 are compatible with voltage regulators and dc-to-dc converters that have active high or active low enable or shutdown inputs, with a choice of open-drain or push-pull output stages. Figure 23 to Figure 25 illustrate how each of the ADM1085/ADM1086/ ADM1087/ADM1088 simple sequencers can be used in multiple-supply systems, depending on which regulators are used and which output stage is preferred. In Figure 23, three ADM1085s are used to sequence four supplies on power-up. Separate capacitors on the CEXT pins determine the time delays between enabling of the 3.3 V, 2.5 V, 1.8 V, and 1.2 V supplies. Because the dc-to-dc converters and ADM1085s are connected in a cascade, and the output of any converter is dependent on that of the previous one, an external controller can disable all four supplies simultaneously by disabling the first dc-to-dc converter in the chain. For power-down sequencing, an external controller dictates when the supplies are switched off by accessing the ENIN inputs individually. 3.3V DC/DC IN OUT EN ADM1085 VCC ENOUT 3.3V ENIN CEXT VIN 3.3V 2.5V DC/DC IN OUT EN ADM1085 VCC ENOUT 3.3V ENIN CEXT VIN 3.3V 1.8V DC/DC IN OUT EN ADM1085 VCC ENOUT 3.3V ENIN CEXT VIN 3.3V 1.2V DC/DC IN OUT EN ENABLE CONTROL 12V tEN1 tEN2 tEN3 EXTERNAL DISABLE 12V 3.3V 2.5V 1.8V 1.2V Figure 23. Typical ADM1085 Application Circuit |
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