RP508 Series
600mA 6MHz PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

Download Datasheet

  • Description

    The RP508 Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier featuring 600mA* output current. The power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control type by inputting a signal to the MODE pin.

    The RP508 includes a soft start circuit, an under-voltage lockout circuit (UVLO), a thermal shutdown circuit, and an auto-discharge function. The RP508 requires only a small numbers of external components to configure a high-efficiency step-up DC/DC converter: an inductor, capacitors and a diode as external components. The high-speed response corresponding to the high-speed switching frequency of 6MHz. The small-sized inductors (1.6 x 0.8 mm, 0.47µH) can be used. A 1.2-mm square compact DFN(PL)1212-6F package is available.

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

  • Spec
    Input Voltage Range 2.3 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 15 µA (VFM, no load)
    Standby Current Typ. 0 µA
    Output Voltage Range 0.8 V to 3.3 V (0.1 V step)
    Output Voltage Accuracy ±1.5% (VOUT ≥ 1.2 V, Ta = 25°C)
    ±18 mV (VOUT < 1.2 V)
    Output Voltage Temperature Coefficient Typ. ±100 ppm/°C
    Output Current 600 mA
    Driver ON-resistance Pch: Typ. 0.33 Ω, Nch: Typ. 0.24 Ω (VIN = 3.6 V)
    Oscillator Frequency Typ. 6.0 MHz
    Maximum Duty Cycle 100%
    Package DFN(PL)1212-6F

    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

    • RP508K181x Efficiency vs. Output Current (VOUT=1.8V)

      RP508K181x Efficiency vs. Output Current (VOUT=1.8V)

    • RP508K181x Efficiency vs. Output Current (VOUT=3.3V)

      RP508K181x 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.

        • [V]
        • [V]
        • [V]
        • [A]
  • 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

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Buck
min (V)
max (V)
min (V)
max (V)