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MIC2297-42YML Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC2297-42YML Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 11 page MIC2297 40V PWM Boost Regulator White LED Driver MLF and MicroLeadFrame is a trademark of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com March 2008 M9999-032708 General Description The MIC2297 is a 600KHz PWM boost-switching regulator that is optimized for driving 6-10 series white LEDs. With its internal 40V switch and a guaranteed switch current of 1.2A, the MIC2297 easily drives a string of 10 white LEDs in series at 20mA, ensuring a high level of brightness and eliminating several ballast resistors. The MIC2297 implements constant frequency 600KHz PWM control. The high frequency PWM operation saves board space by reducing external component sizes. The added benefit of the constant frequency PWM operation is much lower noise and input ripple injected back to the battery source than with variable frequency topologies. To optimize efficiency, the feedback voltage is set to 200mV. This reduced voltage reduces the power dissipation in the current set resistor, and allows the lowest total output voltage, hence minimal current draw from the battery. The MIC2297 is available with output over-voltage protection that protects the IC and external components in case of open LED conditions. The MIC2297 is available in low profile small size 10-pin 2.5mm x 2.5mm MLF ® package. The MIC2297 has a junction temperature range of –40°C to +125°C. Features • 2.5V to 10V input voltage range • Output voltage up to 40V • 1.2A switch current • 600KHz PWM operation • Trimmed 200mV feedback voltage • Output over voltage protection (fixed or adjustable) • PWM Brightness Control • DAC Brightness Control • <1% line regulation • 1µA shutdown current • Over temperature protection • UVLO • 10-pin 2.5mm x 2.5mm MLF® package • –40oC to +125oC junction temperature range Applications • PDAs • GPS systems • Smart phones • Mini PCs • Digital cameras • IP phones • LED flashlights ___________________________________________________________________________________________________________ Typical Applications VIN EN SW FB MIC2297 -42BM L 0.47µF /50V 6.8µH-22µH 10 OVP PGND 1µF 1-Cell Li I on 3V to 4.2V BRT REF AGND COMP 1µF PWM VIN EN SW FB MIC2297 -42BM L 0.47µF /50V 6.8µH-22µH 10 OVP PGND 1µF 1-Ce ll Li I on 3V to 4.2V BRT REF AGND COMP 0.1µF 1µF 0.1µF 10 Series LED Driver with Output OVP 10 Series LED Driver with PWM Brightness Control |
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