Linear introduces an inductor free multi-mode LED driver

Linear Technology Corporation (Linear) launched an inductor type large 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 detection resistor to adjust the current by using internal high side. 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. LTC3218 only a 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 in hinge. 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. Performance overview: LTC3218 - multi mode: 1x or 2x boost mode - automatic mode switch - output current - pulse: 400mA -: 150mA - continuous low noise constant frequency - two seconds flash current timeout to protect LED - automatic soft start - output disconnect - - inductorless 220m internal high side current sensing resistor - for pulse / continuous mode single resistor programming ability - slim application circuit (all components highly <1mm) - 2mm x 3mm 10 DFN lead package