Linear launched the inductor free white LED driver LTC3218

Linear launched inductorless high current white LED driver LTC3218, the device provides LED current up to 400mA of. The framework of the automatic switching between 1x or 2x boost mode, the voltage at both ends of LED it monitors the current source to ILED drop only in detection to mode switching. LTC3218 LED current detection resistor to adjust the high-pressure side inside. This achieves low pressure drop and allow the device to stay in the 1x mode longer, thus the lithium ion / polymer battery voltage range to maximize efficiency, and thus prolong working time and minimizes noise. LTC3218 provides a pulse current up to 400mA for camera flash, or provide a continuous current up to 150mA for camera flashlight lighting applications, with a single resistor programming convenient. When the forward voltage input voltage of the integrated circuit to LED when an ultra low dropout current source to provide accurate current to LED. LTC3218 uses a built-in soft start circuit, which can prevent the over large inrush current during startup, and provides for the protection of the LED flash current timeout of two seconds. The device inductorless charge pump architecture, 1MHz high switching frequency, small number of external components (a jumper capacitor, a programming resistor, two bypass capacitors) and DFN compact package can ensure the solution composition and economic area is very fragile, so very suitable for the camera phone video and flash applications, digital cameras and other portable lighting applications. Only one LTC3218 to LED wire, the clamshell mobile phone is very useful, because in this type of mobile phone, IC and drive on both sides of LED is located in the valve chain. LTC3218 flat (0.75mm) 2mm x 3mm DFN 10 lead package, stock supply, rated operating temperature range of -40oC to +85oC. In the 1000 piece as the unit bulk purchase, each starting at $1.44. Caption: 400mA single camera LED charge pump performance summary: LTC3218 multi mode: 1x or 2x boost mode automatic mode switching output current pulse -: 400mA -: continuous 150mA low noise frequency two seconds flash current timeout to protect LED automatic soft start output Disconnect no 220m internal high side inductor current sensing resistor is suitable for pulse / continuous mode single resistor programming ability slim application circuit (all components <1mm 2mm height) x 3mm 10 DFN lead package