R1221N39AG 데이터 시트보기 (PDF) - RICOH Co.,Ltd.

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R1221N39AG

Step-down DC/DC Converter with Voltage Detector

RICOH Co.,Ltd. 

n BLOCK DIAGRAM

OSC

VIN

EXT

PWM/VFM

CONTROL

Vref

Protection

Soft Start

Chip Enable

Vref

VDOUT

VOUT

CE

GND

n SELECTION GUIDE

In the R1221N Series, the output voltage, the detector threshold, the oscillator frequency, the optional

function, and the taping type for the ICs can be selected at the user’s request.

The selection can be made by designating the part number as shown below;

R1221NXXXX-TR

- --

Code

a

b

c

a bc

Contents

Setting Output Voltage(VOUT):

Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V is possible.

Setting Detector Threshold(-VDET)

Stepwise setting with a step of 0.1V in the range of 1.2V to 4.5V is possible.

A:3.0V

Designation of Oscillator Frequency and Optional Function

A:300kHz, with a PWM/VFM alternative circuit, Latch-type protection

B:500kHz, with a PWM/VFM alternative circuit, Latch-type protection

C:300kHz, without a PWM/VFM alternative circuit, Latch-type protection

D:500kHz, without a PWM/VFM alternative circuit, Latch-type protection

E:300kHz, with a PWM/VFM alternative circuit, Reset-type protection

F:500kHz, with a PWM/VFM alternative circuit, Reset-type protection

G:300kHz, without a PWM/VFM alternative circuit, Reset-type protection

H:500kHz, without a PWM/VFM alternative circuit, Reset-type protection

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Rev. 1.11

-2-

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