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R1232 Series

PWM Step-down DC/DC Converter with Synchronous Rectifier

  • Consumer
  • RoHS

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.

Specs & Datasheets

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

Functional Description

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

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

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
SON-8 R1232D R1232D-FE

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Please contact us or our distributors for unpublished reliability information.

Sample / Buy

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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