The R1290 series are optimized DC/DC converter ICs for TFT LCD displays. Each of the R1290 series contains one PWM step-up DC/DC converter controller and two diode charge-pump controllers. The charge-pumps can control a boost output and a negative output and have the output voltage regulation function with external resistors. The power on sequence can be made with setting the delay time with external capacitors for each charge pump channel.
The R1290 series consists of integrated circuit controllers designed specifically as power sources for hand-held equipment featuring TFT LCD and CCD components. Each chip integrates one PWM step-up DC/DC converter controller alongside two diode charge-pump controllers capable of generating positive and negative output voltages.
Key features include an internal 2A Nch MOSFET driver, adjustable output voltage up to 20V, and programmable power-on sequences using external capacitors. The device operates with a supply voltage range of 2.0V to 5.5V and is housed in a thin 24-pin QFN package.
| Operating Voltage Range | 2.0V ~ 5.5V |
|---|---|
| Internal MOSFET Driver Capability | 2A |
| Maximum Output Voltage (Step-up) | up to 20V |
| Oscillator Frequency Range | 180kHz ~ 1400kHz |
| Package Type | Thin 24-pin Package QFN0404-24 |
| Operating Temperature Range | -40~+95 °C |
The UVLO threshold can be selected as 1.8V, 2.2V, or 2.8V by designating the specific part number suffix.
The R1290 series is designed as a power source for hand-held equipment and specifically for LCD and CCD displays.
The positive and negative charge-pumps turn on in a specific sequence controlled by setting delay times for each channel.