RN5RK Series
8V Input VFM Step-up DC/DC Converter

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  • Description

    The RN5RK Series are low supply current, CMOS-based VFM 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. RN5RK comes in two versions: xx1 version with an internal output transistor and xx2 version with an external transistor.

  • Spec
    Input Voltage Range 0.7 V to 8.0 V (9.0 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 35 µA
    Standby Current Typ. 0 µA
    Start-up Voltage Max. 0.9 V (Ver. xx1)
    Max. 0.8 V (Ver. xx2)
    Output Voltage Range 2.0 V to 5.5 V (0.1 V step)
    Output Voltage Accuracy ±2.5%
    Oscillator Frequency Typ. 100 kHz
    Maximum Duty Cycle Min. 70%, Typ. 77% (Ver. A)
    Min. 47%, Typ. 55% (Ver. B)
    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
    • RN5RKxx1x Typical Application

      RN5RKxx1x Typical Application

      L=100µH, CL=47µF

    • RN5RKxx2A Typical Application

      RN5RKxx2A Typical Application

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

    • RN5RK301A Efficiency vs. Output Current

      RN5RK301A Efficiency vs. Output Current

    • RN5RK302A Efficiency vs. Output Current

      RN5RK302A 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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