R1172x SERIES SUPER LOW ON RESISTANCE / LOW VOLTAGE 1A LDO NO.EA-122-130924 OUTLINE 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 0.32. 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. FEATURES Output Current ............................................................ 1A Supply Current ............................................................. Typ. 60A Standby Current .......................................................... Typ. 0.1A 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. 500 mA Built-in Fold-Back Protection Circuit ........................... Typ. 250mA (Current at short mode) Built-in Thermal Shutdown Circuit .............................. Thermal Shutdown Temperature Typ. 150C Released Temperature Typ. 120C Built-in Auto Discharge Function ................................ D Version Output capacitors ....................................................... CIN=COUT=Tantalum 4.7F (VOUT < 1.0V) > CIN=COUT=Ceramic 4.7F (VOUT 1.0V) = APPLICATIONS Local Power source for Notebook PC. Local Power source for portable communication equipments, cameras, and VCRs. Local Power source for home appliances. 1 R1172x BLOCK DIAGRAMS R1172xxx1A VDD VOUT Vref Current Limit Thermal Shutdown CE GND R1172xxx1B R1172xxx1D VDD VOUT VDD VOUT Vref Vref Current Limit Current Limit Thermal Shutdown Thermal Shutdown CE GND CE GND SELECTION GUIDE The output voltage, chip-enable polarity, auto discharge function, and package for the ICs can be selected at the users request. Product Name Package Quantity per Reel Pb Free Halogen Free R1172Nxx1-TR-FE SOT-23-5 3,000 pcs Yes Yes R1172Hxx1-T1-FE SOT-89-5 1,000 pcs Yes Yes R1172Dxx1-TR-FE HSON-6 3,000 pcs Yes Yes R1172Sxx1-E2-FE HSOP-6J 1,000 pcs Yes Yes xx : The output voltage can be designated in the range from 0.8V(08) to 5.0V(50) in 0.1V steps. (HSOP-6J : 0.8V to 3.5V) (For other voltages, please refer to MARK INFORMATIONS.) : CE pin polarity and auto discharge function at off state are options as follows. (A) active, without auto discharge function at off state (B) active, without auto discharge function at off state (D) active, with auto discharge function at off state 2