RM517 Series
0.3V Ultra-low Output Voltage 300mA Buck DC/DC Module

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  • Description

    The RM517 is a CMOS-based low-voltage step-down DC/DC module that achieves high efficiency by ultralow quiescent current (IQ = 0.3 µA) and VFM (maximum switching frequency of 1 MHz) control. Since the RM517 has a built-in inductor and the package is 3.0 (mm) x 2.4 (mm) x 0.8 (mm), QFN2430-8, it is suitable for high density mounting on board.

    Key Benefits

    • A built-in thin inductor simplifies the board design and dedicates to miniaturize the system.
    • An ultra-low quiescent current (IQ = 0.3 µA) and high efficiency at all output current range.
    • Low output voltage range (0.3 V to 1.2 V) contributes to low power drive of the system.
    • Due to a built-in inductor, the number of external components can be reduced, and the purchasing risk such as EOL can be reduced.

  • Spec
    Input Voltage Range 1.8 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Standby Current Typ. 0.01 µA
    Operating Quiescent Current Typ. 0.3 µA
    Output Voltage Range 0.3 V to 1.2 V (0.1 V step)
    Output Voltage Accuracy ±18 mV (Ta = 25°C)
    Output Current 300 mA
    Oscillator Frequency 1 MHz
    Package QFN2430-8

    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

    • Efficiency vs. Output Current (VOUT=0.5V)

      Efficiency vs. Output Current (VOUT = 0.5 V)

    • 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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