The R1202x Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs and OLED with constant current. There are two types. The A/B versions are optimized for the general use or the drive of PMOLED, and the D version is optimized for the serial drive of white LED with constant current. The R1202x includes an under-voltage lockout circuit (UVLO), a soft-start circuit, and an over-voltage protection circuit (OVP), a thermal shutdown circuit. By simply using an inductor, divider resisters, and capacitors as external components, OLED and white LEDs can be driven with high efficiently. At the standby mode, the internal NPN transistor can separate the output from the input. (Shutdown function) The A/B version with auto-discharge function is selectable. D Version can set white LED current with feedback resister (R1). The brightness of the LEDs and the soft-start time can be adjusted by applying a PWM signal (200Hz to 300kHz) to the CE pin. In addition to DFN1616-6B, 0.95mm thickness TSOT-23-6 is available.
The R1202x Series are CMOS-based PWM step-up DC/DC converters designed to drive white LEDs and OLEDs with constant current. The series includes two types: the A/B versions optimized for general use or PMOLED driving, and the D version optimized for serial white LED driving. Key features include under-voltage lockout (UVLO), soft-start circuitry, over-voltage protection (OVP), thermal shutdown, and a shutdown function that separates output from input using an internal NPN transistor.
| Supply Current (Icc) | Typ. 800nA (Vin= 5.5V, Vrs = OV, Lx atno load) |
|---|---|
| Standby Current (Iistandapy) | Max. 5nA |
| Input Voltage Range (Vin) | +2.3V to 5.5V (A/B Version) |
| Coil-current Limit Circuit | Typ. 350mA |
| Feedback Voltage (VrB) | 1.0V (A/B Version) |
| Over Voltage Protection Circuit (OVP) | Controllable by PWM signal |
| Soft Start Time (tstart) | Typ. 2ms (A/B Version) |
| Feedback Voltage Accuracy | + 1.5% (A/B Version) |
| Oscillator Frequency (fosc) | Not specified in text |
The series is optimized to drive white LEDs and OLED with constant current.
The available packages are DFN1616-6B and TSOT-23-6.
Yes, it includes a shutdown function where an internal NPN transistor separates the output from the input.