Amstelveen, The Netherlands Ricoh announces the R1172x and R1173x low noise LDOs with a very low on-resistance level. The two parts are the most powerful LDOs in Ricoh's product range and are available in adjustable or fixed output voltage versions. Various packages can be selected depending on the application. The LDOs have only 0.18 Ohm on-resistance and 180 mV dropout voltage at 1000mA output current. This extends battery life and prevents high heat dissipation or large heat sinks on the circuit board. The R1172x and R1173x operate in a range from 1.4 V to 6.0 V and the power supply can be designed in an efficient way by connecting the LDO input directly to an output of another power management IC, thus avoiding large differential voltages between LDO input and output and causing more heat dissipation at a reasonable output current. Any fixed output voltage setting from 0.8 V up to 5.0 V is possible and can be ordered in 0.1 V increments. An adjustable version is also available. The LDOs offer high ripple rejection performance of 70 dB in combination with a low supply current level of 60 µA. Load regulation is typical 3mV. Ricoh Europe BV , Amstelveen, The Netherlands. www.ricoh-semiconductor.com.
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