R1211x Series PWM step-up DC/DC controller is a low supply current CMOS-based PWM step-up DC/DC converter controller.
The R1211x Series are CMOS-based PWM step-up DC/DC converter controllers featuring low supply current. The series includes an oscillator, PWM control circuit, reference voltage unit, error amplifier, and protection circuits. Phase compensation is internal for B/D versions and external for A/C versions.
| Input Voltage Range | 2.5V to 6.0V |
|---|---|
| Oscillator Frequency | 300kHz, 700kHz |
| Maximum Duty Cycle | Typ. 90% |
| Operating Temperature Range | -40 ~ +85 °C |
The soft-starting time is typically set at 9ms for the A/B, 700kHz version.
The soft-starting time is typically set at 10.5ms for the C/D, 300kHz version.
The delay time for latch state can be set with an external capacitor.