Amstelveen, The Netherlands Ricoh announces the R5325x Dual Seamless LDO in a single package. The low power LDO is enhanced with a circuit which dynamically improves the input and load transient response performance significantly at higher output current demands and consequently results in a behavior such as a low noise LDO. Ricoh developed another unique alternative solution to save power consumption in order to extend the battery life of an application.
With basic LDO’s one can only choose between either low power or low noise types. A combination of these features can be obtained by using a so called 3-mode LDO with 2 control terminals (CE and ECO) and makes it possible to switch between fast transient, low power and off mode. However this requires additional wiring on the circuit board and software to control all these functions. With Seamless LDO technology, Ricoh added another simple option to make use of combined functions as described above.
At low output current demand the Seamless LDO behaves like a normal low power LDO, saves power and has a slow transient response. When high output current is required in case the application is fully active the LDO automatically increases the ripple rejection ratio and behaves like a low noise LDO with fast transient response. The supply current increases accordingly. Finally the LDO can be disabled by controlling the chip enable pin for minimum power consumption.
Ricoh Europe BV , Amstelveen, The Netherlands. www.ricoh-semiconductor.com.