Load Switch

Load Switch

R5540K Typical Application

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.

Load Switch Lineup

Product
Name
ON
Resistance
Supply
Current
Operating Voltage
Range
Output
Current
Current Limit
Threshold
Internal
FET
CE Other Features? Package Data
Sheet
(PDF)
Typ. Typ. Max.
R5540K002 120mΩ 9µA 0.75V to 3.6V 200mA 350mA 500mA Nch H/L Discharge : xxxC/D
Soft-Start
Reverse : OFF
DFN(PLP)
1010-4F
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R5540K004 0.8V to 3.6V 450mA 700mA 1A
R5541K 18mΩ 25µA VIN : 0.6V to 4.8V
VBIAS : 2.5V to 5.5V
3A - - Nch H Thermal
Reverse : OFF
Discharge : xxxD
Soft-Start : Adjustable
DFN(PLP)
1216-6G
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