OUTLINE

The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low supply current. As an output capacitor, a 10µF or more ceramic capacitor can be used with the R1232D. Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a chip enable circuit, a synchronous rectifier, Nch. driver transistor, and so on. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. (As for R1232D001x type, divider resistors are also necessary.) In terms of the output voltage, it is fixed internally in the R1232Dxx1x types. While in the R1232D001x types, the output voltage is adjustable with external divider resistors.

FEATURES

• Two choices of Oscillator Frequency ............................1MHz, 2.25MHz

(Small inductors can be used. 4.7µH for 1MHz/2.2µH for 2.25MHz)

• Built-in Driver ON Resistance .......................................P-channel 0.2Ω (at VIN=5.0V)

• Built-in Soft-start Function.............................................Typ. 1.0ms (fosc=1MHz type)

• Output Voltage ..............................................................0.9V to 3.3V (xx1x Type)

0.8V to VIN (001x Type)

• High Accuracy Output Voltage ......................................±2.0

• Built-in Current Limit Circuit ..........................................Typ. 1.4A

• Package ........................................................................SON-8 (t=0.9mm)

APPLICATIONS

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

• Power source for HDD