MIC3203/MIC3203-1 High-Brightness LED Driver Controller with High-Side Current Sense Features General Description 4.5V to 42V Input Voltage Range The MIC3203 is a hysteretic, step-down, constant-current, high-brightness LED (HB LED) High Efficiency (>90%) driver. It provides an ideal solution for interior/exterior 5% LED Current Accuracy lighting, architectural and ambient lighting, LED bulbs, MIC3203: Dither Enabled for Low EMI and other general illumination applications. MIC3203-1: Dither Disabled The MIC3203 is well suited for lighting applications that High-Side Current Sense require a wide input voltage range. The hysteretic Dedicated Dimming Control Input control gives good supply rejection and fast response Hysteretic Control (No Compensation) during load transients and PWM dimming. The high-side current sensing and on-chip current-sense Up to 1.5 MHz Switching Frequency comparator delivers LED current with 5% accuracy. Adjustable Constant LED Current An external high-side current-sense resistor is used to Overtemperature Protection set the output current. 40C to +125C Junction Temperature Range The MIC3203 offers a dedicated PWM input (DIM) that enables a wide range of pulsed dimming. A Applications high-frequency switching operation up to 1.5 MHz allows the use of smaller external components Architectural, Industrial, and Ambient Lighting minimizing space and cost. The MIC3203 offers LED Bulbs frequency dither feature for EMI control. Indicators and Emergency Lighting The MIC3203 operates over a junction temperature Street Lighting from 40C to +125C and is available in an 8-pin SOIC Channel Letters package. 12V Lighting Systems (MR-16 Bulbs, A dither disabled version MIC3203-1 is also available in Under-Cabinet Lighting, Garden/Pathway the same package as the MIC3203. Lighting) Package Type MIC3203 8-Lead SOIC (M) (Top View) VCC 1 8DRV CS 2 7 PGND VIN 3 6 DIM AGND 4 5 EN 2019 Microchip Technology Inc. 1DS20006250A-page MIC3203/MIC3203-1 Typical Application Circuit MIC3203 STEP-DOWN LED DRIVER D VIN L RCS CIN 10F LEDs 8 MOSFET 2 CS DRV RG N 3 VIN MIC3203YM MIC3203-1YM 5 1 EN VCC CVCC 1F 6 DIM 4 AGND PGND 7 Functional Block Diagram D L RCS (4.5V 42V) LED4 LED1 LED2 LED3 LED5 LED6 CIN 10F VIN VCC 5V EN REGULATOR CVCC 10F 177mV UVLO DRV FF C1 S Q RG R CS N PGND 35mV C2 SGND DITHER MIC3203 ONLY DIM THERMAL SHUTDOWN DS20006250A-page 2 2019 Microchip Technology Inc.