Same voltage is necessary for different function blocks. In that case, to make a power tree, a higher than required voltage is generated by DC/DC converter and distributed the appropriate voltage to each function block via LDO. In another case, the same voltage is generated by DC/DC converter directly, and distributed the voltage via load switch. In using LDO method, a certain dropout voltage between input and output is necessary, therefore, power loss should be bigger than using load switch method. Not only that, to secure the phase compensation of an LDO, external capacitors are often necessary, therefore more space is required.
On the other hand, load switches do not have the regulation function, however, internal output transistor's on resistance is very small, therefore dropout voltage can be minimized and suppression of the power loss is possible. External capacitors are unnecessary.
|Product Name||ON Resistance||Supply Current||Operating Voltage Range||Output Current||Current Limit Threshold||Internal FET||CE||Other Features||Package||Datasheet|
|R5540||120mΩ||9µA||0.75V to 3.6V||200mA||350mA||500mA||Nch||H/L||Discharge
Reverse : OFF
|0.8V to 3.6V||450mA||700mA||1A|
|R5541||18mΩ||25µA||VIN : 0.6V to 4.8V
VBIAS : 2.5V to 5.5V
Reverse : OFF
Soft-Start : Adjustable
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