R5220 Series
400mA PWM Step-down DC/DC Converter with Switch Function

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  • Description

    The R5220 Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R5220 also has the function of switching to the LDO regulator. By switching with the MODE pin, the device can be used as an LDO regulator (Output Current 50mA) in the smaller output current range, while it can be used as a DC/DC converter (Output Current 400mA*) under high load conditions. (The polarity of the MODE pin is selectable.) The DC/DC converter contains an under-voltage lockout circuit (UVLO), a soft start circuit, and a latch type protection circuit. By simply using an inductor and a capacitor, a high-efficiency DC/DC converter can be easily configured.

    *) This is an approximate value, because output current depending on conditions and external parts.

  • Spec
    Input Voltage Range 2.8 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 350 µA (DC/DC operation)
    Typ. 5.0 µA (LDO operation)
    Standby Current Typ. 0.1 µA
    Output Voltage Range 1.0 V to 3.3 V (0.1 V step)
    Output Voltage Accuracy ±2% (VOUT ≥ 1.5 V, Ta = 25°C)
    ±30 mV (VOUT < 1.5 V)
    Output Current 400 mA (DC/DC operation)
    50 mA (LDO operation)
    Driver ON-resistance Pch: 0.5 Ω, Nch: 0.5 Ω (VIN = 3.6 V)
    Oscillator Frequency Typ. 1.2 MHz
    Package DFN(PL)2514-6

    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

    • R5220K181A Efficiency vs. Output Current

      R5220K181A 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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