R1224N252H RICOH Co.,Ltd., R1224N252H Datasheet

R1224N252H

Manufacturer Part Number

R1224N252H

Description

Manufacturer

RICOH Co.,Ltd.

Datasheets

1.R1224N122M.pdf (42 pages)

2.R1224N402G.pdf (42 pages)

3.R1224N252H.pdf (35 pages)

Specifications of R1224N252H

Date_code

05+

Packing_info

SOT-153

Current page: 1 of 35
Download datasheet (435Kb)

■ OUTLINE

phase compensation circuit, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable

circuit, resistors for output voltage detect, and input voltage detect circuit. A low ripple, high efficiency step-down

DC/DC converter can be easily composed of this IC with only several external components, or a power-transistor,

an inductor, a diode and capacitors. Output Voltage is fixed or can be adjusted with external resistors (Adjustable

types are without PWM/VFM alternative circuit).

the VFM oscillator from PWM oscillator. Therefore, the efficiency at small load current is improved. Several types of

the R1224NXXX, which are without a PWM/VFM alternative circuit, are also available.

protection circuit 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. When the cause of large load current or something else is

removed, the operation is automatically released and returns to normal operation.

IC be standby and suppresses the consumption current and avoid an unstable operation.

■ FEATURES

■ APPLICATIONS

Rev. 1.11

The R1224N Series are CMOS-based PWM step-down DC/DC Converter controllers with low supply current.

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

Further, built-in UVLO function works when the input voltage is equal or less than UVLO threshold, it makes this

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

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

● Power source for battery-powered equipment.

● Power source for household electrical appliances.

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

camcorders.

● Standby Current

● High Accuracy Output Voltage

● Low Temperature-Drift Coefficient of Output Voltage

● Range of Input Voltage

● Built-in Soft-start Function and Protection Function (Reset type protection)

● Three options of Oscillator Frequency

● High Efficiency

● Output Voltage

Stepwise Setting with a step of 0.1V in the range of 1.2V to 6.0V as

fixed voltage type. Reference Voltage of Adjustable Type is 1.0V

Typ. 0.0µA

2.3V 18.5V

Typ. 90%

- 1 -

±2.0%

180kHz, 300kHz, 500kHz

PWM/VFM step-down DC/DC Converter

R1224N Series

Typ. ±100ppm/ C

2002. Aug. 5

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