High_side_switches_for_33_Voperation

Published:2009/7/24 22:52:00 Author:Jessie | From:SeekIC

Figure 8-58 shows an LTC1157 connected to provide high-side switching (Chapter 2) for two 3.3-V loads. Figure 8-59 shows the gate-voltage (above supply) characteristics for the LTC1157, which is a dual, low-voltage MOSFET driver specifically designed for operation between 2.7 V and 5.5 V The LTC1157 internal charge pump boosts the gate-drive voltage 5.4 V above the 3.3-V positive supply (or 8.7 V above ground). This voltage fully enhances a logic-level N-channel below 4.6 V, and housekeeping is performed (data storage, etc.) before the batteries are completely discharged. The other three channels of the LTC 1156 act as switches (under microprocessor control) to power the remaining sections of the computer. The number of switches can be increased by adding more LTC1155 or LTC1156 circuits as needed. LINEAR TECHNOLOGY, APPLICATION NOTE 53, P. 11.



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