R1173x SERIES Super low on resistance/Low voltage LDO NO.EA-123-111027 OUTLINE 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 0.32. 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. FEATURES Output Current.............................................................1A Supply Current ............................................................. Typ. 60A Standby Current ........................................................... Typ. 0.1A 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 4.7F COUT=Tantalum 4.7F (VOUT<1.0V) > COUT=Ceramic 4.7F (VOUT 1.0V) = APPLICATIONS Local Power source for Notebook PC. Local Power source for portable communication equipments, cameras, and videos. Local Power source for home appliances. 1 R1173x BLOCK DIAGRAMS R1173xxx1B R1173xxx1D VDD VDD VOUT VOUT Vref Vref Current Limit Current Limit GND CE CE GND R1173x001B R1173x001D VDD VDD VOUT VOUT ADJ ADJ Vref Vref Current Limit Current Limit CE GND CE GND 2