Micrel's MIC3203 is a hysteretic, step-down, constant-current, high-brightness LED driver. It provides an ideal solution for interior and 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.
The MIC3203 offers a dedicated PWM input (DIM) that enables a wide range of pulsed dimming. A high-frequency switching operation up to 1.5 MHz allows the use of smaller external components, minimizing space and cost. The MIC3203 offers a frequency dither feature for EMI control. The MIC3203 operates over a junction temperature from -40°C to 125°C.
- 4.5 V to 42 V input voltage range
- High efficiency (>90%)
- ±5% LED current accuracy
- High-side current sense
- Dedicated dimming control input
- Up to 1.5 MHz switching frequency
- Adjustable constant LED current
- Overtemperature protection
- -40°C to 125°C junction temperature range