R1172x Series


Data Sheet / Flyer
Data Sheet * Flyer

The R1172x Series are CMOS-based positive voltage regulator ICs. The R1172x Series have features of super low dropout, 1A output current capability. Even the output voltage is set at 1.5V, on resistance of internal FET is typically 0.32Ω. Therefore, applications that require a large current at small dropout are suitable for the R1172x series. Low input voltage is acceptable and low output voltage can be set. The minimum input voltage is 1.4V, and the lowest set output voltage is 0.8V. Each of these ICs consists of a voltage reference unit, an error amplifier, resistor net for setting output voltage, a current limit circuit at over-current, a chip enable circuit, a thermal-shutdown circuit, and so on. A stand-by mode with ultra low consumption current can be realized with the chip enable pin. The output voltage of R1172 is fixed in the IC.

Since the packages for these ICs are SOT-23-5, SOT-89-5, HSON-6, and HSOP-6J with high power dissipation, high density mounting of the ICs on boards is possible.

Output Current 1A
Supply Current Typ. 60µA
Standby Current Typ. 0.1µA
Input Voltage Range 1.4V to 6.0V
Output Voltage 0.8V to 5.0V (0.1V steps)
(For other voltages, please refer to MARK INFORMATIONS.)
Dropout Voltage Typ. 0.32V (VOUT=1.5V, IOUT=1A)
Typ. 0.18V (VOUT=2.8V, IOUT=1A)
Ripple Rejection Typ. 70dB (VOUT=2.8V)
Output Voltage Accuracy ±2.0%
Temperature-Drift Coefficient of Output Voltage Typ. ±100ppm/°C
Line Regulation Typ. 0.05%/V
Load Regulation Typ. 15mV at IOUT=300mA,
Typ. 50mV at IOUT=1A
Packages SOT-23-5, SOT-89-5, HSON-6, HSOP-6J
Built-in Inrush current limit circuit Typ. 500mA
Built-in Fold-Back Protection Circuit Typ. 250mA (Current at short mode)
Built-in Thermal Shutdown Circuit Thermal Shutdown Temperature ; Typ. 150°C
Released Temperature ; Typ. 120°C
Built-in Auto Discharge Function D version
Output capacitors CIN=COUT=Tantalum 4.7µF (VOUT < 1.0V)
CIN=COUT=Ceramic 4.7µF (VOUT ≥ 1.0V)

  • Local Power source for Notebook PC.
  • Local Power source for portable communication equipments, cameras, and VCRs.
  • Local Power source for home appliances.
Data Sheet Flyer Package Info. Mark Info. Quality Assurance Data
R1172x Series R1172x Series SOT-23-5 R1172N Reliability
SOT-89-5 R1172H Reliability
HSON-6 R1172D Reliability
HSOP-6J R1172S Reliability

All PDF files are less than 1MB unless otherwise stated.

  • Buy Products / Order Sample


Ricoh semiconductor products are available at those dealers.


Page Top