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MIC2297

Micrel Semiconductor
Part Number MIC2297
Manufacturer Micrel Semiconductor
Description 40V PWM Boost Regulator White LED Driver
Published Apr 24, 2010
Detailed Description MIC2297 www.DataSheet4U.com 40V PWM Boost Regulator White LED Driver General Description The MIC2297 is a 600KHz PWM bo...
Datasheet PDF File MIC2297 PDF File

MIC2297
MIC2297

Overview
MIC2297 www.
DataSheet4U.
com 40V PWM Boost Regulator White LED Driver 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 6.
8µH-22µH 6.
8µH-22µH VIN SW OVP 1-Cell Li I on 3V to 4.
2V 1µF EN MIC2297 BR...


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