Switch ICs

Aiming at saving energy, not only the battery-powered application, but all electronic equipment is required to consumption power limit according to each local standard.
To save energy, instead of using LDO, switch IC for each circuit block is used after DC/DC converter. Simple MOSFET can play the role as a switch, but load switch IC can include protection circuits, discharge function at off state, and a slew rate control circuit.
As a result, saving space and intensive function realization are possible. Ricoh provides wide variety lineup of switch ICs with low on resistance MOSFET and protection circuits in one chip.

Switch ICs Lineup

Category Function Applications Products
USB Switch USB power line protection
USB power line ON/OFF control
USB powered application
(PC, PC peripheral, Digital TV, STB, printer, smartphone)
R5520H
R5523N
R5524x
Rectifier Switch Output rectifier regardless of the input polarity Toy, healthcare product powered by Dry cell. R5590x
Load Switch Power line ON/OFF control and distribution
(Secondary power supply switch)
Power saving at standby or sleep required equipment such as portable communication equipment, DSC, DSVC, PC, MFP. (R5527K)
R5540K
R5541K
Battery Line Switch Battery line protection (Primary power supply switch)
or Load switch
Secondary battery powered equipment such as smartphone, tablet PC, PND, notebook PC.
Load switch for any electronic equipment.
R5527K
Intelligent
Power Switch
Power line's systematic protection
(Secondary power supply switch)
Same as load switch
(Highly protection solution)
R5550K
External Power
Switch
Several power line switch over control Alternative required among AC adapter, USB charge, Wireless charge R5528Z
OVP Switch Over voltage protection against the input pin Charger protection for secondary battery powered equipment (R5528Z)
R5560Z
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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