RP904 Series
1A Step-down DC/DC Converter with Synchronous Rectifier and Through mode

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  • Description

    The RP904 Series are CMOS-based step-down DCDC converters with Synchronous Rectifier featuring 1 A* output current and have through mode. RP904 includes an under-voltage lockout circuit (UVLO), a soft start circuit and a timer latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DCDC converter can be easily configured.

    The output voltage of DCDC converter can be selected from 2 voltage by inputting signal to VSEL pin. The DCDC converter is PWM/VFM manual switching control. RP904 is able to select DCDC mode or through mode by inputting signal to BYPASS pin. WLCSP-11-P2 package is available.

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

  • Spec
    Input Voltage Range 2.5 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 435 µA (Through mode)
    Typ. 410 µA (PWM mode, non-switching)
    Typ. 165 µA (VFM mode, non-switching)
    Standby Current Typ. 0.02 µA (VIN = 5.5 V, CE = "L")
    Output Voltage Range VSET1: 1.2 V to 3.3 V (0.1 V step)
    VSET2: 1.0 V to 1.5 V (0.1 V step)
    Output Voltage Accuracy VSET1: ±2%
    VSET2: ±30 mV
    Output Current 1 A
    Oscillator Frequency Typ. 2 MHz
    Maximum Duty Cycle Min. 100%
    Package WLCSP-11-P2

    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

      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.

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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.

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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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