RN5RF

The RN5RF Series are voltage regulator ICs which control external driver transistors with high ripple rejection,high accu-racy output voltage, low supply current by CMOS process. Each of these voltage regulator ICs consists of a voltage refer-ence unit, an error amplifier, output voltage setting resistor, short circuit current limiting circuit and chip enable circuit. These ICs are suitable for constructing regulators with ultra low dropout voltage and an output current in the range of several tens of mA and several hundreds mA. In addition to low supply current by CMOS process, chip enable function can be used to conserve battery life during standby.

Features of the RN5RF are:(1)ultra low supply current:TYP 30A; (2)standby mode:TYP 30A; (3)high accuracy output Voltage:±2.0%; (4)high ripple rejection:TYP 60dB/f=1kHz; (5)low dropout voltage:TYE O.1V/IouT=100mA,dependent on external Tr.; (6)Low Temperature:TYP±100ppm/0C; (7)high line regulation:TYP 0.05%/V; (8)output voltage:stepwise setting with a step of O.1V in the range of 1.8V to 6.0V; (9)current limit for external Tr:TYE 8mA. Limit a base current.

The absolute maximum ratings of the RN5RF can be summarized as:(1)input voltages:12V;(2)storage temperature range:-55 to 125;(3)input voltage for CE/CE pin:-0.3 to Vnr+0.3 V;(4)EXT output voltage:12 V;(5)EXT output current:50mA;(6)power dissipation:150mW;(7)operating temperature range:-40 to 85.Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. Moreover, such values for any two items must not be reached simultaneously Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily imply functional operation below these limits.The base current of an external Tr. is monitored and controlled by went within a proper range.Furthermore, the other current limit an internal Base Current Limit circuit to keep went increas-es sharply when input Voltage VIN becomes lower than circuit prevents a problem which is that a base Set Output Voltage.