RP550 Series
Dual 1A PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

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  • Description

    The RP550 Series are dual output CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier.

    RP550 can be selected from two control types by input signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current.

    RP550 includes a soft start circuit, an under-voltage lockout circuit (UVLO), thermal shutdown circuit and a latch protection circuit.

    By simply using an inductor, resistors and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2 µH) and output capacitor (10 µF) can be used by the switching of 2.25 MHz.

  • Spec
    Consumer Industrial Automotive
    Input Voltage Range 2.3 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C) -40°C to 105°C (150°C) -40°C to 105°C (150°C)
    Supply Current Typ. 45 µA (VFM, no load, per channel)
    Standby Current Typ. 0 µA
    Output Voltage Range 0.6 V to 3.3 V
    Feedback Voltage 0.6 V
    Feedback Voltage Accuracy ±9 mV
    Feedback Voltage Temperature Coefficient ±100 ppm/°C
    Output Current 1 A x 2ch
    Driver ON-resistance Typ. Pch. 0.25 Ω, Nch. 0.21 Ω (VIN = 3.6 V)
    Oscillator Frequency Typ. 2.25 MHz Typ. 2.3 MHz Typ. 2.3 MHz
    Maximum Duty Cycle Min. 100%
    Package DFN(PL)2730-12 DFN3030-12 DFN3030-12

    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

    • RP550K001A Efficiency vs. Output Current (VOUT=3.3V)

      RP550K001A Efficiency vs. Output Current (VOUT=3.3V)

    • 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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