The R1283x 2ch DC/DC converter is designed for CCD & OLED Display power source. It contains a step up DC/DC converter and an inverting DC/DC converter to generate two required voltages by CCD & OLED Display. Step up DC/DC converter generates boosted output voltage up to 20V. Inverting DC/DC converter generates negative voltage up to VIN voltage minus 20V independently. Start up sequence is internally made. Each of the R1283x series consists of an oscillator, a PWM control circuit, a voltage reference, error amplifiers, over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), an Nch driver for boost operation, a Pch driver for inverting. A high efficiency boost and inverting DC/DC converter can be composed with external inductors, diodes, capacitors, and resistors.
The Ricoh R1283x Series is a 2-channel DC/DC converter designed to generate two required voltages for CCD and OLED displays. It integrates a step-up DC/DC converter and an inverting DC/DC converter, capable of generating a boosted output up to 20V and a negative voltage up to Vin minus 20V independently. The device features internal Nch and Pch MOSFET drivers, over-current protection, and selectable start-up sequences.
| Operating Voltage | 2.5V to 5.5V |
|---|---|
| Step Up DC/DC Output | Up to 20V |
| Inverting DC/DC Output | Up to Vin-20V |
| Internal Nch MOSFET Driver Ron | 400mQ2Typ. |
| Internal Pch MOSFET Driver Ron | 400mQ Typ. |
| Maximum Duty Cycle | 91%(Typ.) |
| Operating Frequency | 300kHz / 700kHz / 1400kHz |
| Operating Temperature Range | -40 to 85 °C |
| Power Dissipation (DFN) | 1000 mW |
The operating input voltage range is 2.5V to 5.5V.
Yes, the start-up sequence can be designated as either Step-up then Inverting, or Inverting then Step-up.
The available oscillator frequencies are 300kHz, 700kHz, and 1400kHz.