The R1218x Series are PWM control type step-up DC/DC converter ICs with low supply current.
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.
| 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 |
The R1218x series is available in standard SOT-23-6 and very tiny DFN(PLP)1820-6 packages.
Yes, the R1218xxx1A model has a built-in diode, allowing it to drive up to 4 LEDs without an external diode.