MIC3291

MIC3291 1.2MHz PWM White LED Driver with Internal Schottky Diode and Single-Wire Linear Brightness Control General Description Features The MIC3291 is a PWM switching boost regulator that is Single wire combines 16 level linear brightness and optimized for constant current white LED (WLED) driver shutdown control applications. The MIC3291 features an internal Schottky 18V / 25V OVP options supports up to four and six diode, allowing an efficient DC/DC solution that requires WLEDs only four external components. Startup in any one of 16 brightness levels The MIC3291 allows for a single-wire simple digital Internal Schottky diode interface to control the dimming over 16 steps with a linear 2.5V to 6.5V input voltage scale. The preprogramming feature allows the user to 1.2MHz PWM operation select any one of the 16 WLED current levels as the start up brightness level. Over 500mA switch current The feedback voltage of the MIC3291 is only 250mV, 250mV reference voltage allowing high efficiency while retaining excellent accuracy ±5% LED current accuracy for the WLED current. <1µA shutdown current The MIC3291 implements a constant frequency 1.2MHz UVLO and over-temperature protection PWM control scheme. The high frequency PWM operation Thin SOT23-6L package option saves board space by reducing external component sizes. The 1.2MHz PWM scheme also reduces switching noise 2mm × 2mm leadless MLF® package option and ripple to the input power source. –40oC to ...