R1210 Series
8V Input PWM Step-up DC/DC Converter

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  • Description

    The R1210 Series are low supply current, CMOS-based PWM step-up DC/DC converters. By simply using an inductor, a diode, and a capacitor as external components, a high-efficiency step-up DC/DC converter can be easily configured. The xx1 version with an internal output transistor and the xx2 version with an external transistor are available. The oscillator frequency can be selected from 100kHz or 180kHz. The xx1A version is also available, which contains a basic frequency changeover circuit that switches the oscillator frequency from 100kHz to 35kHz when output load is reduced. R1210 also has a function that detects drastic changes in output voltage and reduces the amount of overshoot/undershoot by switching control mode.

  • Spec
    Input Voltage Range 0.8 V to 8.0 V (9.0 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 10 µA
    Standby Current Typ. 0.5 µA
    Start-up Voltage Max. 0.9 V (R1210Nxx1x)
    Max. 0.8 V (R1210Nxx2x)
    Output Voltage Range 2.2 V to 3.5 V (0.1 V step) (R1210Nxx1A)
    2.2 V to 6.0 V (0.1V step) (R1210NxxxC/D)
    Output Voltage Accuracy ±2.5% (Ta = 25°C)
    Output Voltage Temperature Coefficient Typ. ±100 ppm/°C
    Oscillator Frequency 100 kHz (R1210Nxx1A, R1210NxxxC)
    180 kHz (R1210NxxxD)
    Efficiency Typ. 88% (VIN = Set Output Voltage ×0.6 [V], IOUT = 10 mA)
    Package SOT-23-5

    Protections / Functions

    TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
  • Technical
    • R1210Nxx1x Typical Application

      R1210Nxx1x Typical Application

      L: 100µH, CL: 22µFx2

    • R1210Nxx2x Typical Application

      R1210Nxx2x Typical Application

      L: 27µH, CL: 47µF×2, Rb: 300Ω, Cb: 0.01µF

    • R1210N301C Efficiency vs. Output Current

      R1210N301C Efficiency vs. Output Current

    • R1210N302C Efficiency vs. Output Current

      R1210N302C Efficiency vs. Output Current

    • Related Links

      • Prime Designer

        Online Design Tool

        Registration to myNISD is required to use some of the functions, such as simulations.

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  • 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.

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Functional Description

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

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