R1232 Series
PWM Step-down DC/DC Converter with Synchronous Rectifier

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  • Description

    The R1232 Series are low supply current CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R1232 includes a soft start circuit, under-voltage lockout circuit (UVLO) and latch type protection circuit. By simply using an inductor, a capacitor, and (resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. R1232 comes in two types: R1232Dxx1A/B with internally fixed output voltage and R1232D001C/D with adjustable output voltage with external resistors.

  • Spec
    Input Voltage Range 2.6 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 140 µA (1 MHz), 240 µA (2.25 MHz) (Non-switching)
    Standby Current Typ. 0 µA (CE = "L")
    Output Voltage Range Internally Fixed Ver.: 0.9 V to 3.3 V
    Externally Adjustable Ver.: 0.8 V to VIN (Feedback Voltage: 0.8V)
    Output Voltage Accuracy ±2% (Ta = 25°C)
    Feedback Voltage Accuracy ±16 mV
    Output Current 1 A
    Oscillator Frequency Typ. 1 MHz, 2.25 MHz
    Maximum Duty Cycle Min. 100%
    Package SON-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
    • R1232Dxx1A/B Typical Application

      R1232Dxx1A/B Typical Application

      L=4.7µH, 2.2µH
      CIN=10µF, COUT=10µF

    • R1232D001C/D Typical Application

      R1232D001C/D Typical Application

      For VOUT=2.0V, R1=33kΩ, R2=22kΩ, Cb=100pF

    • R1232D331A Efficiency vs. Output Current

      R1232D331A 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.

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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