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MIC3203/MIC3203-1
High-Brightness LED Driver Controller
with High-Side Current Sense
General Description
Features
The MIC3203 is a hysteretic, step-down, constant-current,
High-Brightness LED (HB LED) driver. It provides an ideal
solution for interior/exterior lighting, architectural and
ambient lighting, LED bulbs, and other general illumination
applications.
The MIC3203 is well suited for lighting applications
requiring a wide-input voltage range. 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.
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4.5V to 42V input voltage range
High efficiency ( > 90%)
± 5% LED current accuracy
MIC3203: Dither enabled for low EMI
MIC3203-1: Dither disabled
High-side current sense
Dedicated dimming control input
Hysteretic control (no compensation!)
Up to 1.5MHz switching frequency
Adjustable constant LED current
The MIC3203 offers a dedicated PWM input (DIM) which
enables a wide range of pulsed dimming. A high-frequency
switching operation up to 1.5MHz allows the use of smaller
external components minimizing space and cost. The
MIC3203 offers frequency dither feature for EMI control.
The MIC3203 operates over a junction temperature from
? 40 ° C to + 125 ° C and is available in an 8-pin SOIC
package.
A dither disabled version MIC3203-1 is also available in
the same package as the MIC3203.
? Over-temperature protection
? ? 40 ° C to + 125 ° C junction temperature range
Applications
? Architectural, industrial, and ambient lighting
? LED bulbs
? Indicators and emergency lighting
? Street lighting
? Channel letters
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com .
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12V lighting systems (MR-16 bulbs, under-cabinet
lighting, garden/pathway lighting)
_________________________________________________________________________________________________________________________
Typical Application
MIC3203 Step-down LED Driver
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 2010
M9999-032910-A
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