R1212 Series
PWM Step-up DC/DC Controller

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  • Description

    The R1212 Series are low supply current CMOS-based PWM step-up DC/DC controllers. R1212 does not include an internal output transistor. By simply using a power MOS, an inductor, a diode, resistors, and capacitors as external components, a high-efficiency step-up DC/DC converter can be easily configured. The oscillator maximum duty cycle and soft start time as well as phase compensation can be set with external resistors and capacitor (The oscillator maximum duty cycle can be selected from the type with/without internal limit.)

    The oscillator frequency can be selected from 300kHz, 700kHz, or 1.4MHz. The latch type protection circuit embedded into the device latches the external driver in the "OFF" state when the oscillator maximum duty cycle continues for a predetermined period of time setting by an external capacitor. R1212 also includes an under-voltage lockout circuit (UVLO).

  • Spec
    Input Voltage Range 2.2 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 400 µA (300 kHz)
    Typ. 600 µA (700 kHz)
    Typ. 900 µA (1.4 MHz)
    Feedback Voltage 1.0 V
    Feedback Voltage Accuracy ±15 mV
    Feedback Voltage Temperature Coefficient Typ. ±150 ppm/°C
    Oscillator Frequency Typ. 300 kHz, 700 kHz, 1.4 MHz
    Maximum Duty Cycle Adjustable with external capacitors
    (If internal limit is set by version, Typ. 90% or Typ. 91.5%)
    Package SON-8

    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
    • Typical Application

      Typical Application

      L: 10µH(A), 4.7µH(B), 22µH(C), C1: 2.2µF, C2: 1µF, C3: 15µF, C4=C5: 1000pF(A), 680pF(B), 1500pF(C), C6: 0.1µF, C7: 0.1µF, R3: 1kΩ, R4: 4.7kΩ, R5: 240kΩ, R6: 300kΩ
      Output voltage set value 5V…R1: 120kΩ, R2: 30kΩ, 10V…R1: 180kΩ, R2: 20kΩ, 15V…R1: 140kΩ, R2: 10kΩ

    • R1212D100A Efficiency vs. Output Current

      R1212D100A 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.

Download Datasheet

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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