R5528Z Additional Switchs ICs make soft-start function and protection function can be expected
Switch ICs can cut off the power path and consumption current of the application can be suppressed. Simple on and off can be realized by using a MOSFET, but if you choose a switch IC, soft-start function and protection function can be expected.
Background of the trouble
The power line of the application is 3.3V. This line was directly connected to the device A and the device B. But the device A should start up later than device B and the input of device B should reach more than 1.5V when the device A start-up.
Customer's issue and condition confirmation
To solve the problem, some critical points must be considered.
Trouble shoooting Process
According to the information from the customer, part can be sorted out.
>>Which type switch IC is the best?
So-called load switched are usually low voltage input is acceptable, in this case, it is not preferreble for considering the input voltage condition.
USB switch is one of candidates, but generally, the component size is relatively big. (Nisshinbo Micro Devices R5524K 1.8mm x 2.0mm)
Conclusion：
Nisshinbo has an Ovp switch which can be used for this purpose. Part # is R5528Z
The R5528Z series have UVLO function. The released voltage is typically 2.05V.
The pacakge is WLCSP, 1.27mm x 1.27mm (0.64mm thickness). Current capability is 3A.
On resistance is 54mohm@5V.
Enable pin is "L" active. ENB pin is used for On and Off. In this case, if ENB pin is tied to GND, external control is unnecessary. Further, the debounce time is included after power on, so mis-operation by VIN ramp up variation can be avoided.
About Nisshinbo
New Japan Radio Co., Ltd. and Ricoh Electronic Devices Co., Ltd. of the Nisshinbo Group were integrated and started operation as Nisshinbo Micro Devices Inc. in January 2022. Nisshinbo integrated the strengths of both companies and refine "Connect Everything" technology, and, therefore, strive for further growth and development as an "Analog Solution Provider toward the realization of an ultra-smart society.
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