R1171S Series



Data Sheet

Data Sheet

The R1171x Series are CMOS-based positive voltage regulator ICs. The R1171x Series have features of low dropout voltage, high output voltage accuracy, low consumption current. Each of these ICs consists of a voltage reference unit, an error amplifier, resistor net for setting output voltage, a current limit circuit at short mode, a chip enable circuit, and thermal shutdown circuit. The output voltage of R1171x is fixed in the IC.
Low consumption current by the merit of CMOS process and built-in transistors with low ON-resistance make low dropout voltage and chip enable function prolongs the battery life. These regulators are remarkable improvement on the current regulators in terms of input transient response, and load transient response.
Thus, the R1171x Series are suitable for various power sources.
The R1171x Series are available in HSOP-6J package which supports high wattage.


Input Voltage Range (Maximum Rating) 2.1V to 6.0V (7.0V)
Supply Current Typ. 130µA
Standby Current Typ. 0.1µA
Output Current Min. 1.5A (VIN=VOUT+1.0V)
Output Voltage 1.5V to 5.0V (0.1V steps) , 1.85V, and 2.85V
Ripple Rejection TYP. 50dB
Output Voltage Accuracy ± 2.0%
Dropout Voltage Typ. 0.09V (VOUT=3.0V, IOUT=300mA)
Output Voltage Temperature Coefficient Typ. ± 100ppm/°C
Line Regulation Typ. 0.05%/V
Package HSOP-6J
Built-in Current Limit Circuit
Built-in Thermal Shutdown Circuit
Ceramic capacitor for phase compensation CIN=COUT=Ceramic 10µF (VOUT<1.8V)
CIN=COUT=Ceramic 4.7µF (VOUT>= 1.8V)


  • Power source for car accessories including car audio equipment, car navigation system, and ETC system.

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Data Sheet Package Quality Assurance Data Suffix Composition & Content*1
R1171S Series HSOP-6J Reliability -AE Sn (Sn: 100%)
  • *1The composition of the product cannot be specified.
  • *2The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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