Transcription of FEATURES DESCRIPTIO U - analog.com
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FEATURES DESCRIPTIO U - analog.com
1LT34913491fa Cellular Phones PDAs, Handheld Computers Digital Cameras MP3 Players GPS ReceiversLi-Ion Driver for Four White LEDsWhite LED Driver withIntegrated Schottky in SC70and 2mm 2mm DFN Drives Up to Six White LEDs from a 3V Supply High Side Sense Allows One Wire Current Source Internal Schottky Diode One Pin Dimming and Shutdown 27V Open LED Protection Switching Frequency 5% Reference Accuracy VIN Range: to 12V Requires Only 1 F Output Capacitor Wide 300:1 True Color PWMTM Dimming Range 8-Lead SC70 Package Low Profile 6-Lead DFN Package(2mm 2mm )EfficiencyFEATURESDESCRIPTIOUAPPLICATIO SUTYPICAL APPLICATIOUCTRLVINL110 HVIN3V TO 5 VRSENSE10 3491 TA01aLT3491 SHUTDOWN ANDDIMMING CONTROLSWCAPLEDGNDC21 FC11 FC1: TAIYO YUDEN LMK212BJ105 MDC2: TAIYO YUDEN GMK316BJ105 MLL1: MURATA LQH32CN100 The LT 3491 is a fixed frequency step-up DC/DC converterspecifically designed to drive up to six white LEDs in seriesfrom a Li-Ion cell. Series connection of the LEDs providesidentical LED currents resulting in uniform brightness andeliminating the need for ballast resistors.
3 LT3491 3491fa TYPICAL PERFOR A CE CHARACTERISTICS UW Switch Saturation Voltage (VCESAT) Schottky Forward Voltage Drop Shutdown Current (VCTRL = 0V) Sense Voltage (VCAP – VLED) vs VCTRL Open-Circuit Output Clamp Voltage Input Current in Output Open
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