MIC2873YCS-TR Microchip

MIC2873 1.2A High-Brightness Flash LED Driver with Single-Wire Serial Interface General Description Features The MIC2873 is a high-current, high-efficiency flash LED Up to 1.2A flash LED driving current driver. The LED driver current is generated by an Highly-efficient synchronous boost driver integrated inductive boost converter with a 2MHz switching Control through single-wire serial interface or external frequency which allows for the use of very small inductor control pin and output capacitor. These features make the MIC2873 Input voltage range: 2.7V to 5.5V an ideal solution for high-resolution camera phone LED flash light driver applications. True load disconnect Configurable safety time-out protection MIC2873 operates in either flash or torch modes that can Output overvoltage protection (OVP) be controlled through the single-wire serial interface and/or external control pin. A robust single-wire serial interface LED short-circuitdetection and protection allows the host processor to control the LED current and 1A shutdown current brightness. The MIC2873 is available in a 9-bump 1.30mm Available in 9-bump 1.30mm 1.30mm WLCSP 1.30mm WLCSP package. package Datasheets and support documentation are available on Micrels web site at: www.micrel.com. Applications Camera phones/mobile handsets Cell phones/smartphones LED light for image capture/auto focus/white balance Handset video light (torch light) Digital cameras Portable applications Typical Application Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel, Inc. MIC2873 Ordering Information Operating Ambient Temperature (1) Part Number Marking Code Package Range MIC2873YCS 73A 40C to +85C 9-Bump 1.30mm 1.30mm WLCSP Note: 1. WLCSP bump A1 identifier = . Pin Configuration 9-Bump 1.30mm x 1.30mm WLCSP (CS) (Top View) Pin Description Pin Number Pin Name Pin Function A1 LED LED Current Sink Pin. Connect the LED anode to OUT and cathode to this pin. A2 DC Single-wire interface serial control input. Boost converter output pin to be connected to the anode of the LED. Connect a low-ESR ceramic A3 OUT capacitor of at least 4.7F to PGND. B1 LGND Linear Ground. LED current return path. Flash Mode Enable Pin. Asserting this pin high enables MIC2873 into the flash mode. If this pin is B2 FEN left floating, it is pulled-down internally by a built-in 1A current source when the device is enabled. B3 SW Inductor Connection Pin. It is connected to the internal power MOSFETs. C1 AGND Analog Ground. C2 VIN Supply Input Pin. Connect a low-ESR ceramic capacitor of at least 4.7F to AGND. C3 PGND Power Ground. Inductor current return path. Revision 1.0 July 17, 2014 2