Key facts
- Brand
- Ricoh
- Model
- R1218X
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-07-09
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Ricoh R1218x Series Step-up DC/DC Converter Datasheet
The R1218x Series are PWM control type step-up DC/DC converter ICs with low supply current, fully dedicated to driving White LEDs. Each IC consists of an NMOS FET, an oscillator, a PWM comparator, a voltage reference unit, an error amplifier, a current limit circuit, an under voltage lockout circuit (UVLO), and an over-voltage protection circuit (OVP). The series is available in standard SOT-23-6 and very tiny DFN(PLP)1820-6 packages.
Read onlineRicoh R1218X specifications
| Input Voltage | 1.8V to 5.5V |
|---|---|
| Oscillator Frequency | Typ. 1.2MHz |
| Maximum Duty Cycle | Typ. 91% to 92% |
| Feedback Voltage | Typ. 0.2V |
| UVLO Threshold Voltage | Typ. 1.6V |
| Lx Current Limit Protection | Typ. 700mA |
| Operating Temperature Range | -40 to 85 °C |
Source: Ricoh R1218x Series Step-up DC/DC Converter Datasheet
All Ricoh R1218X documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What are the available packages for the R1218x series?
The R1218x series is available in standard SOT-23-6 and very tiny DFN(PLP)1820-6 packages.
Can the R1218x drive up to 4 LEDs without an external diode?
Yes, the R1218xxx1A model has a built-in diode, allowing it to drive up to 4 LEDs without an external diode.
What is the oscillator frequency of the R1218x Series?
The oscillator frequency is typically 1.2MHz.
From: Ricoh R1218x Series PWM Step-up DC/DC Converter Datasheet
Does the R1218x Series include internal protection circuits?
Yes, the series includes an under-voltage lockout circuit (UVLO) and an over-voltage protection circuit (OVP).
From: Ricoh R1218x Series PWM Step-up DC/DC Converter Datasheet