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ADM1088AKS-REEL7 датащи(PDF) 11 Page - Analog Devices |
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ADM1088AKS-REEL7 датащи(HTML) 11 Page - Analog Devices |
11 / 16 page ADM1085/ADM1086/ADM1087/ADM1088 Rev. 0 | 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/dc converters and ADM1085s are connected in 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/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 |
Аналогичный номер детали - ADM1088AKS-REEL7 |
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Аналогичное описание - ADM1088AKS-REEL7 |
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