R1223N502F RICOH Co.,Ltd., R1223N502F Datasheet

R1223N502F

Manufacturer Part Number

R1223N502F

Description

Manufacturer

RICOH Co.,Ltd.

Datasheets

1.R1223N152H.pdf (19 pages)

2.R1223N502D.pdf (19 pages)

Specifications of R1223N502F

Date_code

05+

Packing_info

SOT-153

Current page: 1 of 19
Download datasheet (208Kb)

n n n n OUTLINE

n n n n FEATURES

n n n n APPLICATIONS

Rev. 1.11

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a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, and resistors for

voltage detection. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC

with only four external components, or a power-transistor, an inductor, a diode and a capacitor.

into the VFM oscillator from PWM oscillator, therefore the efficiency at small load current is improved. The

R1223N XXXB type, which is without a PWM/VFM alternative circuit, is also available.

two types of protection function. One is latch-type protection circuit, and it works to latch an external Power

MOSFET with keeping it disable. To release the condition of protection, after disable this IC with a chip enable

circuit, enable it again, or restart this IC with power-on. The other is Reset-type protection circuit, and it works to

restart the operation with soft-start and repeat this operation until maximum duty cycle condition is released.

Either of these protection circuits can be designated by users’ request.

l Power source for hand-held communication equipment, cameras, video instruments such as VCRs,

l Power source for battery-powered equipment.

l Power source for household electrical appliances.

process.

l Standby Current · · · · · · · · · · · · · · · · ·TYP. 0µA

l High Accuracy Output Voltage · · · · · · · · · ·±2.0%

l Low Temperature-Drift Coefficient of Output Voltage · · · · · TYP. ±100ppm/°C

With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching

If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. There are

l Range of Input Voltage · · · · · · · · · · · · ·2.3V~13.2V

l Built-in Soft-start Function and Two choices of Protection Function (Latch-type or Reset type)

l Two choices of Oscillator Frequency · · · · · ·300kHz, 500kHz

l High Efficiency · · · · · · · · · · · · · · · · · ·TYP. 90%

l Output Voltage · · · · · · · · · · · · · · · · · Stepwise Setting with a step of 0.1V

The R1223N Series are PWM step-down DC/DC Converter controllers with low supply current by CMOS

Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier,

camcorders.

- 1 -

PWM/VFM step-down DC/DC Converter

R1223N Series

in the range of 1.5V ~ 5.0V

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‘99.12.8

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