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MIC3287-24YML Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC3287-24YML Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 9 page April 2010 1 M9999-042910 Micrel, Inc MIC3287 MIC3287 1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL® General Description The MIC3287 is a 1.2MHz pulse width modulated (PWM) step-up switching regulator that is optimized for constant cur- rent white LED driving applications. With a switch current of over 350mA, the MIC3287-24 drives a string of up to 4 white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors. TheMIC3287implementsaconstantfrequency1.2MHzPWM current-mode control scheme. The high frequency PWM op- eration saves board space by reducing external component sizes. The added benefit of the constant frequency PWM control scheme as opposed to variable frequency control schemes is much lower noise and input ripple injected back to the battery source. To optimize efficiency, the feedback voltage is set to only 250mV. The MIC3287 is also available with a maximum 24V over-voltage protection. The MIC3287 is available in low profile Thin SOT-23 5-pin and Thin SOT-23 6-pin packages. The MIC3287 has a junc- tion temperature range of –40°C to +125°C. All support documentation can be found on Micrel’s web site at: www.micrel.com. Typical Application 10µH 0.22µF 250mV 1-Cell Li Ion 1µF 2 3 1 4 5 MIC3287YD5 VIN EN SW FB GND 3-Series White LED Driver in Thin SOT-23-5 Features • 2.8V to 6.5V Input Voltage • 350mA Switch Current • 1.2 MHz PWM Operation • 250mV Feedback Voltage • Optional 24V Output Over-Voltage Protection (OVP) • Up to 36V Output Voltage without OVP • <1% Line and Load Regulation • <1µA Shutdown Current • Over-Temperature Protection • Under-Voltage Lock Out (UVLO) • Low Profile Thin SOT-23-5 Package Option • Low Profile Thin SOT-23-6 Package Option • 8-pin 2mm x 2mm MLF® Package Option • –40°C to +125°C Junction Temperature Range Applications • White LED Driver for Backlighting: - Cell phones - PDAs - GPS systems - Digital cameras - MP3 players - IP phones • LED Flashlights • Constant Current Power Supplies Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc. 10µH 0.22µF 1µF 1-Cell Li Ion MIC3287-24YD6 VIN EN SW OVP FB GND 250mV 5 1 3 2 4 6 4-Series White LED Driver with Output OVP in Thin SOT-23-6 |
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