RP400 Series
Current Mode PWM/VFM Step-up DC/DC Converter

  • Description

    The RP400 Series are CMOS-based automatic switch PWM- or VFM-controlled step-up DC/DC converters. RP400 includes a soft start circuit. By simply using an inductor, a capacitor, a diode, and (resistors) as external components, a high-efficiency step-up DC/DC converter can be easily configured. Due to current mode PWM control, the RP400 provides a fast response and high efficiency. Ceramic output capacitors can be used.

    The output voltage can be selected from the internally fixed or the externally adjustment. The RP400 has an anti-ringing switch that prevents inductor current from ringing in PWM discontinuous mode. RP400 switches automatically to VFM control in low output current, keeping high efficiency. In addition to SOT-23-5 package, a 1.8mm × 2.0mm square DFN(PLP)1820-6 package is also available.

  • Spec
    Input Voltage Range 0.7 V to 5.5 V (6.0 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 300 µA (VSET = 3.0 V, switching)
    Typ. 160 µA (non-switching)
    Standby Current Typ. 0.15 µA (CE="L") (Ver. A/C)
    Start-up Voltage Max. 0.9 V (Ver.C: Max. 1.5 V)
    Output Voltage Range 1.8 V to 5.0 V
    (Internally Fixed Ver.: xx1, Externally Adjustable Ver.: 001)
    Output Voltage Accuracy ±2% (Ta = 25°C)
    Oscillator Frequency Typ. 700 kHz
    Maximum Duty Cycle Typ. 88%
    Package DFN(PLP)1820-6, 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
    • RP400x001A Typical Application (Externally adjustable output voltage type)

      RP400x001A Typical Application (Externally adjustable output voltage type)

    • RP400xxx1A Typical Application (Internally fixed output Voltage type)

      RP400xxx1A Typical Application (Internally fixed output Voltage type)

    • RP400x001A Efficiency vs. Output Current

      RP400x001A Efficiency vs. Output Current

  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
    • Please contact us or our distributors for unpublished reliability information.

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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