Protected Load Management Switch


Posted on Aug 4, 2012

In an effort to conserve energy, simple shutdown schemes are incorporated into many battery-operated circuits. Not all circuits lend themselves to direct control, however, and instead the supply must be turned off by a switch. The LTC®1477 high side switch is designed for this purpose and includes short-circuit current limit and thermal shutdown to guard against faulty loads. Figure 1 shows a simplified block diagram of the LTC1477.



At the heart of the LTC1477 is a 70mW N-channel MOSFET. The split drains allow for selection of 0.85A, 1.5A or 2A current limit. While enabled, the LTC1477 draws about 100mA quiescent current, dropping to 10nA in its disabled state. Figure 2 shows th




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