The R1286K Series are CMOS-based PWM step-up/inverting DC/DC converters featuring 250mA×2 output current with synchronous rectifier. R1286K includes a soft start circuit, an under-voltage lockout circuit (UVLO), a latch protection circuit, a thermal shutdown circuit, and a shutdown circuit. By simply using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured. R1286K is available in two types: R1286K001B is the type to which the output voltage (VOUTP and VOUTN) can be adjusted by external resistors. R1286KxxxA/C~M are the type to which the step-up output voltage (VOUTP) is internally fixed and the inverting output voltage (VOUTN) can be adjusted dynamically by the single wire interface. The R1286K has a sequenced start up. After the CE pin is enabled, the step-up output is starting up followed by the inverting output after a delay time. As for shutdown, both outputs will be turned off by the auto-discharge function. R1286K is used for applications such as LCD and AMOLED displays.
The Ricoh R1286K Series is a CMOS-based PWM step-up/inverting DC/DC converter featuring a 250mA x 2 output current capability. It includes built-in protection circuits such as under-voltage lockout, latch protection, thermal shutdown, and auto-discharge functions to ensure reliable operation.
| Supply Current (Icc) | Typ. 1.2mA (Vcc=4.8V, In non-switching) |
|---|---|
| Output Current | Step-up: 250mA, Inverting: 250mA |
| Oscillator Frequency | Typ. 1.75MHz |
| Input Voltage Range | 2.3V to 4.8V |
| Maximum Duty Cycle | Step-up: Typ. 85%, Inverting: Typ. 90% |
| Step-up Output Voltage | 4.6V to 5.8V (internally fixed) |
| Inverting Output Voltage | 2.0V to -6.0V (internally fixed) |
| Feedback Voltage Accuracy | + 9mV (Except B), + 15mV (B) |
| Thermal Shutdown Circuit | Stops at 150°C |
| Package Type | DFN(PLP)2730-12 |
The typical supply current is 1.2mA when Vcc is 4.8V and the device is in non-switching mode.
The R1286K Series is used for applications such as LCD and AMOLED displays.
Yes, it includes a thermal shutdown circuit that stops operation at 150°C.