MIC2860-2PYC6-TR Microchip

MIC2860-P High Efficiency 2 Channel WLED Driver with PWM Control General Description Features The MIC2860-2P is a high efficiency white LED (WLED) High efficiency (no switching losses) driver designed to drive two WLEDs and greatly extend PWM frequency as low as 250Hz battery life for portable display backlighting, and keypad Input voltage range: 3.0V to 5.5V backlighting in low cost mobile devices. The MIC2860-2P Linear driver dropout of 52mV at 30.2mA architecture provides the highest possible efficiency by Matching better than 0.5% (typical) eliminating switching losses present in traditional charge pumps or inductive boost circuits. It features a typical Current accuracy better than 1.0% (typical) dropout of 52mV at 30.2mA per channel. This allows the Available in Thin SOT-23 and SC-70 packages WLEDs to be driven directly from the battery eliminating switching noise and losses present with the use of boost Applications circuitry. Mobile handsets The two channels have typical matching of 0.5%, which Digital cameras ensures uniform display illumination under all conditions. The WLEDs brightness is externally preset by a resistor Portable media/MP3 players and dimmed using PWM interface operating down to less Portable navigation devices (GPS) than 1% duty cycle. Portable applications The MIC2860-2P is available in Thin SOT-23 and SC-70 six pin packages with a junction temperature range of 40C to +125 C. Datasheets and support documentation can be found on Micrels web site at: www.micrel.com. Typical Application LCD Display Backlight with 2 WLEDs 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. MIC2860-2P Ordering Information (1) (2) Part Number Mark Code Junction Temperature Range Package MIC2860-2PYC6 62P 40C to +125C 6-Pin SC-70 MIC2860-2PYD6 602P 40C to +125C 6-Pin Thin SOT-23 Notes: 1. Under bar symbol ( ) may not be to scale. 2. Package is GREEN RoHS compliant. Lead finish is NiPdAu. Mold compound is halogen free. Pin Configuration 6-Pin SC-70 (C6) 6-Pin Thin SOT-23 (D6) (Top View) (Top View) Pin Description Pin Number Pin Name Pin Function MIC2860-2P 1 EN PWM Control Pin. This pin is used as a PWM input for dimming of WLEDs. Do not leave floating. 2 GND Ground. 3 VIN Voltage Input. Connect at least 1F ceramic capacitor between VIN and GND. 4 LED2 driver. Connect LED anode to VIN and cathode to this pin. Do not leave floating. D2 An internal 1.27V reference sets the nominal maximum WLED current. Example, apply a 9.53k 5 RSET resistor between RSET and GND to set LED current to 30.2mA at 100% duty cycle. 6 LED1 driver. Connect LED anode to VIN and cathode to this pin. Do not leave floating. D1 September 2010 2 M9999-092710-A