Key facts
- Brand
- Ricoh
- Model
- R1205X
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-07-09
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Ricoh R1205x Series Step-Up DC/DC Converter Datasheet
The Ricoh R1205x Series are CMOS-based PVVM control type step-up DC/DC converter ICs featuring low supply current. The series includes the R1205x8xxA version optimized for constant voltage power sources and the R1205x8xxB version optimized for driving white LEDs with constant current, which also supports dynamic brightness adjustment via a PWM signal.
These converters are available in DFN1616-6B and TSOT-23-6 packages. Key features include an input voltage range of 1.8V to 5.5V (for R1205x8xxB) or 2.3V to 5.5V, a typical supply current of 800µA, and built-in protection functions such as peak current limit, over-voltage protection, under-voltage lockout, and thermal shutdown.
Ricoh R1205X specifications
| Input Voltage Range (R1205x8xxA) | 2.3V to 5.5V |
|---|---|
| Input Voltage Range (R1205x8xxB) | 1.8V to 5.5V |
| Supply Current (Typ.) | 800µA |
| Feedback Voltage Accuracy (R1205x8xxA) | ±1% |
| Oscillator Frequency | Typ. 1.2MHz |
| Maximum Duty Cycle | Typ. 91% |
| Over Voltage Protection (OVP) | Typ. 25V |
| Thermal Shutdown Temperature | Typ. 150°C |
| Operating Temperature Range | -40 to 85 °C |
Source: Ricoh R1205x Series Step-Up DC/DC Converter Datasheet
All Ricoh R1205X 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 R1205x Series?
The R1205x Series are available in DFN1616-6B and TSOT-23-6 packages.
How can the output voltage be set for the R1205x8xxA version?
The output voltage is calculated using divider resistors R1 and R2 with the formula: Vout = Vre x (R1+R2)/R1.
What are the two types of R1205x Series converters?
The A versions are optimized for general use, and the B version is optimized for the serial drive of white LED with constant current.
From: Ricoh R1205x Series PWM Step-up DC/DC Converter Datasheet
What is the maximum output voltage for the Over Voltage Protection Circuit?
The Over Voltage Protection Circuit (OVP) is typically set to 25V.
From: Ricoh R1205x Series PWM Step-up DC/DC Converter Datasheet