The R1215D Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current. Each of the R1215D Series consists of an oscillator, a PWM comparator circuit, a reference voltage unit, an error amplifier, a reference current unit, a protection circuit, and an under voltage lockout (UVLO) circuit. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or an inductor, a diode, a power MOSFET, resisters, and capacitors. Maximum duty cycle and the soft start time are easily adjustable with external resistors and capacitors. As for the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain period, the R1215D Series latch the external driver with its off state, or the latch-type protection circuit works. The delay time for latch the state can be set with an external capacitor. To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector threshold level).
The Ricoh R1215D Series consists of CMOS-based PWM step-up DC/DC converter controllers with low supply current. The series includes an oscillator, PWM comparator circuit, reference voltage unit, error amplifier, reference current unit, protection circuit, and under voltage lockout (UVLO) circuit. A low ripple, high efficiency step-up DC/DC converter can be composed of this IC with some external components, or an inductor, a diode, a power MOSFET, resistors, and capacitors.
| Oscillator Frequency | Typ. 700kHz, 1.4MHz |
|---|---|
| Operating Temperature Range | -40 to +85 °C |
| Open Loop Voltage Gain | 100 dB |
| Unity Gain Frequency Band | 1.0 MHz |
| Supply Current | 600 to 1800 pA |
The device operates within a range of -40 to +85 °C.
The typical supply current is 1800 pA when the input voltage is 5.5V.