MIC3223 Datasheet, PDF (1/24 Pages) Micrel Semiconductor – High Power Boost LED Driver with Integrated FET

MIC3223
High Power Boost LED Driver with
Integrated FET
General Description
Features
The MIC3223 is a constant current boost LED driver
capable of driving a series string of high power LEDs. The
MIC3223 can be used in general lighting, bulb replacement,
garden pathway lighting and other solid state illumination
applications.
The MIC3223 is a peak current mode control PWM boost
regulator and the 4.5V and 20V operating input voltage
range allows multiple applications from a 5V or a 12V bus.
The MIC3223 implements a fixed internal 1MHz switching
frequency to allow for a reduction in the design footprint
size. Power consumption has been minimized through the
implementation of a 200mV feedback voltage that provides
an accuracy of ±5%. The MIC3223 can be dimmed through
• 4.5V to 20V supply voltage
• 200mV feedback voltage with an accuracy of ±5%
• Step-up output voltage (boost) conversion up to 37V
• 1MHz switching frequency
• 100mΩ/3.5A internal power FET switch
• LEDs can be dimmed using a PWM signal
• User settable LED current (through external resistor)
• Externally programmable soft-start
• Protection features that include:
– Output over-voltage protection (OVP)
– Under-voltage lockout (UVLO)
– Over temperature protection
the use of a PWM signal and features an enable pin for a _{• Junction temperature range: -40°C to +125°C}
low power shutdown state.
• Available in a exposed pad 16-pin TSSOP package
The MIC3223 is a very robust LED driver and offers the
following protection features: over voltage protection (OVP),
thermal shutdown, switch current limiting and under voltage
Applications
lockout (UVLO).
• Architectural lighting
The MIC3223 is offered in a low profile exposed pad 16-pin • Industrial lighting
TSSOP package.
• Signage
Data sheets and support documentation can be found on • Landscape lighting (garden/pathway)
Micrel’s web site at: www.micrel.com.
• Under cabinet lighting
• MR-16 bulbs
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Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2010
M9999-011510-A