MIC2843YMT-TR Microchip

MIC2843 High-Efficiency 6-Channel Linear WLED Driver with Ultra-Fast PWM Control General Description Features The MIC2843 is a high-efficiency linear white LED (WLED) High efficiency (no voltage boost losses) driver designed to drive up to six WLEDs, greatly Ultra Fast PWM control (200Hz to 500kHz) extending battery life for portable display backlighting, Input voltage range: 3.0V to 5.5V keypad backlighting, and camera flash in mobile devices. Dropout of less than 40mV at 20mA The MIC2843 provides the highest possible efficiency as this architecture has no switching losses present in Matching better than 3% (typical) traditional charge pumps or inductive boost circuits. The Current accuracy better than 1.5% (typical) MIC2843 provides six linear drivers which maintain Maintains proper regulation regardless of how many constant current for up to six WLEDs. It features a typical channels are utilized dropout of less than 40mV at 20mA. This allows the Available in a 2mm x 2mm 10-pin Thin MLF package WLEDs to be driven directly from the battery eliminating switching noise/losses present with the use of boost Applications circuitry. Mobile handsets The six channels are matched better than 3% typical, ensuring uniform display illumination under all conditions. Digital cameras The brightness is controlled through an Ultra Fast PWM Portable media/MP3 players interface operating down to less than 1% duty cycle. Portable navigation devices (GPS) The MIC2843 is available in the 2mm x 2mm 10-pin Thin Portable applications MLF leadless package with a junction temperature range of 40 C to +125C. Datasheets and support documentation can be found on Micrels web site at: www.micrel.com. Typical Application LCD Display Backlight with Six WLEDs High Current Flash Driver Ultra Fast PWM is a trademark of Micrel, Inc. MLF and MicroLeadFrame are registered trademark Amkor Technology Inc. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1 (408) 944-0800 fax + 1 (408) 474-1000 Micrel Inc. MIC2843 Ordering Information (1) (2) Part Number Mark Code Temperature Range Package MIC2843YMT YS3 40C to +125C 10-Pin 2mm x 2mm Thin MLF Note: 1. Thin MLF = Pin 1 identifier. 2. Thin MLF is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is halogen free. Pin Configuration 10-Pin 2mm x 2mm Thin MLF (MT) (Top View) Pin Description Pin Number Pin Function Pin Name 1 VIN Voltage Input. Connect at least 1F ceramic capacitor between V and GND. IN Enable LED drivers. This pin can be used as a PWM input for dimming of WLEDs. Do not leave 2 END floating. An internal 1.27V reference sets the nominal maximum WLED current. Example, apply a 20.5k 3 R SET resistor between R and GND to set LED current to 20mA at 100% duty cycle. SET 4 GND Ground. 5 D6 LED6 driver input. Connect LED anode to VIN and cathode to this pin. 6 D5 LED5 driver input. Connect LED anode to VIN and cathode to this pin. 7 D4 LED4 driver input. Connect LED anode to VIN and cathode to this pin. 8 D3 LED3 driver input. Connect LED anode to VIN and cathode to this pin. 9 D2 LED2 driver input. Connect LED anode to VIN and cathode to this pin. 10 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. EPAD HS PAD Heat sink pad. Not internally connected. Connect to ground. M9999-110810-B November 2010 2