RP901 Series
PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier Equipped with VR and VD

Download Datasheet

  • Description

    The RP901 Series are CMOS-based PWM/VFM step-down DC/DC converters equipped with voltage regulator and voltage detector. The DC/DC converter can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current.

    RP901 was developed for applications that require multiple power supplies such as storage devices. It integrates an 800mA* (A/B/C Version) / 900mA* (D Version) output current step-down DC/DC converter, a 600mA output current LDO regulator, and a voltage detector with a built-in delay circuit into a small package. The regulator can be started after soft start of the DC/DC converter by sequence control. (A/B Version)

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

  • Spec
    Input Voltage Range 4.5 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 460 µA (at PWM mode)
    Typ. 170 µA (at light load, Ver. B, C, D)
    Standby Current Typ. 1 µA (Ver. A)
    Typ. 2 µA (Ver. B, C, D)
    Output Voltage Range DC/DC Section: 1.2 V to 1.8 V (0.1 V step)
    LDO Section: 2.5 V to 3.3 V (0.1 V step)
    Output Voltage Accuracy DC/DC Section: ±2% (Ta = 25°C)
    LDO Section: ±1.0%
    Output Current DC/DC Section:
    800 mA
    900 mA (Ver. D)
    LDO Section: 600 mA
    Driver ON-resistance Typ. Pch 0.25 Ω, Nch 0.25 Ω (VIN = 5 V)
    Oscillator Frequency Typ. 1.2 MHz
    Package DFN(PL)2527-10
    VD Threshold Range 2.0 V to 3.0 V (Ver. A, supervising LDO output voltage)
    3.0 V to 5.0 V (Ver. B, C, D, supervising input voltage)
    VD Threshold Accuracy ±2%
    Release Delay Time Typ. 50 ms

    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
    • RP901K Efficiency vs. Output Current

      RP901K 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.

        • [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)