Switch ICs

As for both portable and non-portable devices, electrical equipment are requested to minimise current consumption to save energy.
Therefore electrical equipment activate only specific circuits depending on the operating mode of the application. A common solution was to use a discrete FET as a switch to shutdown the specific circuit blocks, however additional features for protection are needed.
Ricoh provides various solutions of switch ICs featuring a low ON resistance MOSFET and the required protection circuits into a single chip.

Switch ICs Lineup

Category Function Applications Products
USB Switch USB power line protection,
ON/OFF control of the USB power line.
USB host products
(PCs, PC peripherals, Digital TV, STB, Printers)
R5520H
R5523N
R5524x
Rectifier Switch Detects and corrects the polarity of reversed inserted batteries. Battery operated Toys, Portable health care devices R5590x
Load Switch ON/OFF control and distribution of the power line.
(Secondary power line switch)
Necessary power saving appliance at standby and sleep state.
(Handheld communication equipments, DSC, DSLR, VCR)
R5540K
R5541K
Intelligent
Power Switch
Advanced protection of power line.
(Secondary power line switch)
Same as the Load Switch.
(In case of need for advanced protection)
R5550K
Battery Power
Line Switch
Protection for battery line.
(Primary power line switch)
Can be used as a Load Switch.
Portable equipments using rechargeable battery.
(Smartphone, Tablet, PND, Note PC)
Can be used as a Load Switch for non-portable appliances.
R5527K
Power Selector
Switch
Switching control for input power lines. Switching between charging sources such as an AC adapter,
USB charger and wireless charger.
R5528Z
PC Card &
Express Card
Power Switch
ON/OFF control of the PC Card power line. PC Card bus slot, PC Card reader writer R5533V
ON/OFF control of the Express Card power line. Express Card slot R5538D

Application of Switch ICs

TYPICAL APPLICATION FOR PORTABLE EQUIPMENT

TYPICAL APPLICATION FOR PORTABLE EQUIPMENT

TYPICAL APPLICATION FOR NON-PORTABLE EQUIPMENT

TYPICAL APPLICATION FOR NON-PORTABLE EQUIPMENT

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