R1172 Series
Low Voltage 1A Voltage Regulator

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  • Description

    The R1172 Series are CMOS-based LDO regulators featuring 1A output. The CMOS process provides both high output current and low supply current. The dropout voltage is significantly lower than bipolar regulators. The R1172 handles low voltage with an input voltage from 1.4V and output voltage from 0.8V. Accordingly, the device supports highly integrated, low voltage-driven LSI as a rear stage of the DC/DC converter. The CE pin can switch the regulator into standby mode. In addition to a fold-back protection circuit built into conventional LDO regulators, R1172 has a thermal shutdown circuit and inrush current limit circuit.

  • Spec
    Consumer Automotive
    Input Voltage Range 1.4 V to 6.0 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 60 µA
    Standby Current Typ. 0.1 µA
    Output Voltage Range 0.8 V to 5.0 V (0.1 V step)
    Output Voltage Accuracy ±2.0% (Ta = 25°C)
    Output Voltage Temperature Coefficient Typ. ±100 ppm/°C
    Dropout Voltage Typ. 0.32 V (VSET = 1.5 V, IOUT = 1 A)
    Typ. 0.18 V (VSET = 2.8 V, IOUT = 1 A)
    Line Regulation Typ. 0.05%/V
    Load Regulation Typ. 15 mV (IOUT = 300 mA)
    TYP. 50 mV (IOUT = 1 A)
    Output Current 1 A
    Ripple Rejection Typ. 70 dB (VSET = 2.8 V)
    Output Noise Voltage 30 µVrms
    Package SOT-23-5, SOT-89-5, HSOP-6J, HSON-6 SOT-23-5, SOT-89-5, HSOP-6J

    Protections / Functions

    TSD Reverse Current Limit ISC Inrush Constant Slope ECO mode Auto Discharge External Driver
  • Technical
    • R1172x301x Dropout Voltage vs. Output Current

      R1172x301x Dropout Voltage vs. Output Current

  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

Download Datasheet

Functional Description

TSD Thermal Shutdown Function
Reverse Current Protection Reverse Current Protection
Current Limit Overcurrent Protection
ISC Short Current Protection
Inrush Current Limit Inrush Current Protection
Constant Slope Constant Slope Function
ECO mode ECO Function
Auto Discharge Auto Discharge Function
External Driver External Output Driver Transistor

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Functions Auto Discharge