MIC3201_11 Datasheet, PDF (1/16 Pages) Micrel Semiconductor – High Brightness LED Driver with High-Side Current Sense

MIC3201
High Brightness LED Driver with
High-Side Current Sense
General Description
Features
The MIC3201 is a hysteretic step-down, constant-current,
High-Brightness LED (HB LED) driver capable of driving
up to four, 1A LEDs. It provides an ideal solution for
interior/exterior lighting, architectural and ambient lighting,
LED bulbs, and other general illumination applications.
The MIC3201 operates with an input voltage range from
6V to 20V. The hysteretic control gives good supply
rejection and fast response during load transients and
PWM dimming. The high-side current sensing and on-chip
current sense amplifier delivers LED current with ±5%
accuracy. An external high-side current sense resistor is
used to set the output current.
• 6.0V to 20V input voltage range
• High efficiency (>90%)
• ± 5% LED current accuracy
• High-side current sense
• Dedicated dimming control input
• Hysteretic control (no compensation!)
• 1A internal power switch
• Up to 1MHz switching frequency
• Adjustable constant LED current
• 5V on board regulator
The MIC3201 offers a dedicated PWM input (DIM) which
enables a wide range of pulsed dimming. A high switching
frequency operation up to 1MHz allows the use of smaller
external components minimizing space and cost.
• Over temperature protection
• –40°C to +125°C junction temperature range
• Available in an 8-Pin ePAD SOIC package
The MIC3201 operates over a junction temperature range
of -40°C to +125°C and is available in an 8-pin ePAD
SOIC package.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Applications
• Architectural, industrial, and ambient lighting
• LED bulbs
• Indicators and emergency lighting
• Street lighting
• Channel letters
• 12V lighting systems (MR-16 bulbs, under cabinet
lighting, garden/pathway lighting)
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Typical Application
MIC3201 Step-down LED Driver Circuit
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
February 2011
M9999-021011-B