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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

Standard
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

Download Datasheet

Protections / Functions

TSD OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust

Functional Description

TSD Thermal Shutdown Function
OCP Overcurrent Protection

Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP."
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

Functional Description

TSD Thermal Shutdown Function
OCP Overcurrent Protection

Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP."
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
VIN
min (V)		 2.6
VIN
max (V)		 5.5
VOUT
min (V)		 0.8
VOUT
max (V)		 5.5
IOUT
(mA)		 1000
ISS
(µA)		 140

Technical Documents

  • 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 & Packages

Product Name Compatibility Package Marking Reliability
R1232Dxx1x-TR-FE
  • gradeConsumer
 SON-8 R1232D R1232D-FE
  • 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.

FAQ

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Buy / Contact

  • Purchase, Request for samples and documents
    Sales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
  • Available from 1 piece!
    Our electronic device products are available through our authorized online distributors.
  • Technical Support
R1232 Series