VFM STEP-UP DC/DC

CONVERTER CONTROLLER

RN5RY

1

OUTLINE

The RN5RY

featuring high output voltage accuracy and low supply current by CMOS process. Each of the RN5RY

ICs consists of a voltage reference unit, an error amplifier, an oscillator, a VFM control circuit and feed back resis-

tors. A low ripple, high efficiency step -up DC/DC converter can be composed of the RN5RY

an inductor, a diode, a capacitor, and a drive transistor.

Since the package for these ICs are SOT-23-5( Mini-mold)package, high density mounting of the ICs on boards

is possible.

•

Low Supply Current ..................................................................................TYP. 3µA

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Low Standby Current ..................................................................................TYP. 0.6µA

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Low Temperature-Drift Coefficient of Output Voltage ...........................TYP. ±50ppm / ˚C

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High Accuracy Output Voltage ...................................................................±2.5%

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Low Oscillation Start-up Voltage ...............................................................MAX. 0.8V

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Small Package .............................................................................................SOT-23-5(Mini-Mold)

FEATURES

APPLICATIONS

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Power source for battery-powered instruments.

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Power source for cameras, VCRs, camcorders, pagers, and other hand-held communication instruments.

BLOCK DIAGRAM

+

–

5

3

1

2

Vref

OSC

Output

Buffer

CE

EXT

GND