R1173x Series

Super low on resistance/Low voltage LDO

Data Sheet / Flyer
Data Sheet * Flyer

The R1173x Series are CMOS-based positive voltage regulator ICs. The R1173x Series have features of super low dropout, 1A output current capability, and -3mV typical load regulation at 1A. 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 R1173x 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 types of R1173 are fixed one in the IC and adjustable one (R1173x001x).

Since the packages for these ICs are the SOT-89-5 package, HSON-6, or HSOP-6J, 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 Range 0.8V to 5.0V (0.1V steps) (R1173xxx1)
1.0V to VIN (R1173x001)
(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. −2mV (IOUT=300mA)
Typ. −3mV (IOUT=1A)
Packages SOT-89-5, HSON-6, HSOP-6J
Low inrush current at turning-on Typ. 500mA
Built-in Thermal Shutdown Circuit
Built-in Current Limit Circuit Typ. 250mA
Output capacitors CIN=Ceramic 4.7μF
COUT=Tantalum 4.7μF (VOUT<1.0V)
COUT=Ceramic 4.7μF (VOUT => 1.0V)
  • Local Power source for Notebook PC.
  • Local Power source for portable communication equipments, cameras, and videos.
  • Local Power source for home appliances.
Data Sheet Flyer Package Info. Mark Info. Quality Assurance Data
R1173x Series R1173x Series SOT-89-5 R1173H Reliability
HSON-6 R1173D Reliability
HSOP-6J R1173S 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