R1171S151A Datasheet, PDF (1/36 Pages) RICOH electronics devices division – 2.0A/1.5A LDO REGULATOR

R1172x SERIES
SUPER LOW ON RESISTANCE / LOW VOLTAGE 1A LDO
NO.EA-122-070627
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 0.32Ω. 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.
FEATURES
• Output Current ............................................................ 1A
• Supply Current ............................................................. Typ. 60µA
• Standby Current .......................................................... Typ. 0.1µA
• Input Voltage Range ................................................... 1.4V to 6.0V
• Output Voltage.............................................................. Stepwise setting with a step of 0.1V in the range of
0.8V to 5.0V (Exceptions: HSOP-6J = 0.8V to 3.5V)
• 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. 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)
APPLICATIONS
• Local Power source for Notebook PC.
• Local Power source for portable communication equipments, cameras, and VCRs.
• Local Power source for home appliances.
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