The R1200x Series PWM Step-up DC/DC converters are CMOS-based PWM step-up DC/DC converters, which are optimized to drive passive matrix OLED or white LEDs with constant current. The R1200x includes an under-voltage lockout circuit (UVLO), a soft-start circuit, and an over-voltage protection circuit (OVP). By simply using an inductor, divider resisters, and capacitors as external components, OLEDs and white LEDs can be driven with high efficiently. At the standby mode, the internal NPN transistor can separate the output from the input. By this shutdown function, white LED's current can be completely shutdown, and output voltage for OLED can be completely cut off, therefore, the R1200x does not have bad impact on the life expectancy of OLED. The version with auto-discharge function is available.
The R1200x Series are CMOS-based PWM step-up DC/DC converters designed to drive passive matrix OLEDs or white LEDs. The series includes an under-voltage lockout circuit, a soft-start circuit, and an over-voltage protection circuit. It features a shutdown function that uses an internal NPN transistor to separate the output from the input in standby mode.
| Supply Current (Iop) | Typ. 500pA |
|---|---|
| Standby Current (Istanaby) | Max. 3nA |
| Oscillator Frequency (fosc) | Typ. 1.2MHz |
| Input Voltage Range (Vin) | 2.3V to 5.5V |
| Feedback Voltage Accuracy | +/-1.5% |
| Coil-current Limit Circuit Current limit | Typ. 700mA |
The internal NPN transistor separates the output from the input in standby mode to completely cut off output voltage.
The device can be configured by simply using an inductor, divider resistors, and capacitors as external components.
The typical supply current is 500pA when the input voltage is 5.5V and there is no load.
The over-voltage protection circuit is available with detector thresholds of 17V, 19V, and 21V.