The R1286 Series are CMOS-based PWM step-up/inverting DC/DC converters featuring 250mA×2 output current with synchronous rectifier. R1286 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.
R1286 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~G 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 R1286 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. R1286 is used for applications such as LCD and AMOLED displays.
|Input Voltage Range (Maximum Rating)||2.3 V to 5.5 V (6.0 V)|
|Supply Current||Typ. 1.2 mA (No switching)|
|Standby Current||Typ. 0.1 µA (CE="L")|
|Step-up Output Voltage||4.6 V to 5.8 V (internally fixed),
4.6 V to 5.8 V, Externally adjustable (VFB: 1V) (001B)
|Inverting Output Voltage||-2.0 V to -6.0 V (internally fixed),
-2.0 V to -6.0 V, Externally adjustable (VFB: 0V) (001B) ,
Dynamically adjustable output voltage with single wire interface.
|Feedback Voltage Accuracy||Step-up: ± 9 mV (Except B), ± 15 mV (B)
Inverting: ± 70 mV (Except B) , ± 25 mV (B)
|Output Current||Step-up: 250 mA, Inverting: 250 mA|
|Oscillator Frequency||1.75 MHz|
|Maximum Duty Cycle||Step-up: Typ. 85% , Inverting: Typ. 90%|
|UVLO Detect Voltage||Typ. 2.05 V|
|Soft Start Time||Step-up: Typ. 2.4 ms, Inverting: Typ. 2.8 ms (B)|
|Coil-current Limit Circuit||Step-up: Typ. 1 A, Inverting: Typ. 1.5 A|
|Latch Protection Circuit||Delay time for protection Typ. 16 ms, Typ. 40 ms|
|Thermal Shutdown Circuit||Stops at 150°C|
Efficiency vs. Output Current (Step-up)
Efficiency vs. Output Current (Inverting)
*) The tab is substrate level (GND).
The inverting output voltage (VOUTN), the positive output voltage (VOUTP) and the versions of the inverting output voltage are user-selectable options.
|Product Name||Package||Quantity per Reel|