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R1232 Series
PWM Step-down DCDC Converter with Synchronous Rectifier

Product Specifications

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.

FEATURES

Input Voltage Range (Maximum Rating) 2.6 V to 5.5 V (6.5 V)
Supply Current Typ. 140 µA (1 MHz), 240 µA (2.25 MHz) (No switching)
Standby Current Typ. 0 µA (CE="L")
Output Voltage Range 0.9 V to 3.3 V (Internally fixed, R1232Dxx1A/B)
Externally adjustable (Feedback voltage : 0.8 V, R1232D001C/D)
Output Voltage Accuracy ± 2% (Feedback Voltage Accuracy : ± 16 mV)
Oscillator Frequency 1 MHz, 2.25 MHz
Oscillator Maximum Duty Cycle Min. 100%
UVLO Detect Voltage Typ. 2.25 V
Soft Start Time Typ. 1 ms (1 MHz)
Typ. 0.4 ms (2.25 MHz)
Coil-current Limit Circuit Current limit Typ. 1.4 A
Latch Type Protection Circuit Delay time for protection Typ. 2 ms
Package SON-8
Ceramic capacitors can be used CIN=COUT= 10 µF or more

APPLICATION INFORMATION

R1232Dxx1A/B

L=4.7µH, 2.2µH
CIN=10µF, COUT=10µF

R1232D001C/D

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

TYPICAL CHARACTERISTICS

R1232D331A Efficiency vs. Output Current

PIN DESCRIPTION

SON-8

SON-82.9 mm × 3.0 mm
1 PGND
2 VIN
3 VDD
4 CE
5 VOUT or VFB
6 TEST
7 AGND
8 Lx

*) The tab suspension leads are substrate level (GND).


R1232 Series for Consumer

APPLICATIONS

  • Power source for portable equipment such as PDA, DSC, Notebook PC
  • Power source for HDD

SELECTION GUIDE

In the R1232 Series, the output voltage, the oscillator frequency and the output voltage adjustment for the ICs can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1232Dxx1#-TR-FE
R1232D001$-TR-FE
Consumter SON-8 3,000
  • xx … The output voltage can be designated in the range from 0.9 V(09) to 3.3V(33) in 0.1V steps.
    (For externally adjustable output voltage type, (00).)
  • # … Select the oscillator frequency and output voltage type
    A: 1MHz, internally fixed type
    B: 2.25MHz, internally fixed type
  • $ … Select the oscillator frequency and output voltage type
    C: 1MHz,externally adjustable type
    D: 2.25MHz,externally adjustable type

DOCUMENT/CONTACT

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Technical Support

Package *1 Marking Reliability *2
SON-8 R1232D R1232D (-FE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

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