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R1173x Series

Super low on resistance/Low voltage LDO

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