Key facts
- Brand
- Ricoh
- Model
- R1224N
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-07-10
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Ricoh R1224N Series PWM/VFM Step-Down DC/DC Controller Datasheet
The Ricoh R1224N Series are CMOS-based PWM step-down DC/DC Converter controllers designed for low supply current. Each IC integrates an oscillator, PWM control circuit, reference voltage unit, error amplifier, phase compensation, soft-start, protection, and a PWM/VFM alternative circuit to improve efficiency at small load currents.
The series offers fixed or adjustable output voltages with input ranges from 2.3V to 18.5V. Key features include built-in UVLO, current limit circuits, and reset-type protection against maximum duty cycle conditions. The devices are available in SOT-23-5 packages.
Ricoh R1224N specifications
| Supply Current (Typ) | 20uA to 40uA |
|---|---|
| Input Voltage Range | 2.3V to 18.5V |
| Output Voltage Range (Fixed) | 1.2V to 6.0V |
| Output Voltage Range (Adjustable) | 1.0V to Vin |
| Operating Temperature Range | -40 to 85 °C |
| Oscillator Frequency (L/M Version) | Typ. 180kHz |
| Oscillator Frequency (E/G Version) | Typ. 300kKHz |
| Efficiency | Typ. 90% |
Source: Ricoh R1224N Series PWM/VFM Step-Down DC/DC Controller Datasheet
All Ricoh R1224N documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the supply current of the R1224N series?
The typical supply current ranges from 20uA to 40uA depending on the specific model suffix.
From: Ricoh R1224N Series PWM/VFM Step-Down DC/DC Controller Datasheet
Does this controller include a PWM/VFM alternative circuit?
Yes, when the load current is small, the operation automatically switches into the VFM oscillator from the PWM oscillator to improve efficiency.
From: Ricoh R1224N Series PWM/VFM Step-Down DC/DC Controller Datasheet
What are the typical applications for this controller?
It is used as a power source for hand-held communication equipment, cameras, VCRs, battery-powered equipment, and home appliances.
From: RICOH R1224N Series 18.5V Input PWM/VFM Step-down DC/DC Controller with Ext. Tr Manual
What package type does the R1224N Series use?
The device is available in a SOT-23-5 package.
From: RICOH R1224N Series 18.5V Input PWM/VFM Step-down DC/DC Controller with Ext. Tr Manual